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TACO ZONE CONTROLS WIRING GUIDE
Pages
Switching Relays – Single Zone Wiring 2 – 12
Switching Relays – NON EXP Connected Together with Priority 3 – 19
Switching Relays – EXP Connected Together with Priority 10 – 11
Switching Relays – Multiple Indirect Hot Water Heaters 12 – 13
Switching Relays – EXP Connected To Reset Controls (PC700, 702 & 705) 14 – 21
Zone Valve Controls – NON EXP Connected Together with Priority 22 – 27
Zone Valve Controls – EXP Connected Together with Priority 28 – 31
Zone Valve Controls – Connected To Reset Controls (PC700, 702 & 705) 32 – 39
Hydro Air Fan Controls (HAFC 101 & 201) 40 – 44
Specialty Thermostat and Zone Valve Wiring 45 – 50
Instruction Sheets 51 – 60
Low Water Cutoff and Industrial Flow Switch 61 – 69
Aquastat Wiring 70 – 74
Standard Terms and Definitions – 75
Cross Reference 76 – 77
Do it once.Do it right.
© Taco Catalog No. 100-9.0 Effective Date: May 1, 2003Supersedes Date: August 1, 2001
TACO Product Information
Switching RelaysProduct No. DescriptionSR501 1 Zone Switching RelaySR501-845RP 1 Zone Switching Relay Replacement PC Board for
Honeywell R845, RA89A, RA832 or Comparable RelaySR502 2 Zone Switching Relay with PrioritySR503 3 Zone Switching Relay with PrioritySR504 4 Zone Switching Relay with PrioritySR506 6 Zone Switching Relay with Priority
Switching Relays with PowerPort Options and Expandable to 20 ZonesProduct No. DescriptionSR503-EXP 3 Zone Switching Relay with Priority and 3 PowerPortsSR504-EXP 4 Zone Switching Relay with Priority and 3 PowerPortsSR506-EXP 6 Zone Switching Relay with Priority and 3 PowerPorts
Zone Valve ControlsProduct No. DescriptionZVC403 3 Zone Valve ControlZVC404 4 Zone Valve Control with PriorityZVC405 5 Zone Valve ControlZVC406 6 Zone Valve Control with Priority
Zone Valve Controls with PowerPort Options and Expandable to 20 ZonesProduct No. DescriptionZVC404-EXP 4 Zone Valve Control with Priority and 2 PowerPorts ZVC406-EXP 6 Zone Valve Control with Priority and 2 PowerPorts
Plug-In PowerPort Cards (For use with all -EXP controls)Product No. DescriptionPC600 Post Purge Timer Plug-In CardPC605 Priority Protection Plug-In CardPC610 Universal Timer/Pump Exercise Plug-In Card
Add-On Power Controls (For use with all -EXP controls)Product No. DescriptionPC700 Boiler Reset ControlPC702 2-Stage Boiler Reset ControlPC705 Variable Speed Pump Injection Mixing Control
Fan ControlsProduct No. DescriptionHAFC101 Hydro Air Fan ControlHAFC201 Hydro Air Fan Control with Optional Time Delays
Do it once.Do it right.
2
AT
TO: 120 VACPOWER
CIRCULATOR
JUMPER
120 VACINPUT
THERMOST
R WT T COM
24VAC
N/O N/C N/C N/ON H 3 4 4 6 6 5
TO: ZC
SR5011 ZONE
SWITCHING RELAY
POWER
T STAT
TO: ZR
ALTERNATIVE WIRING(TANKLESS COIL)
T
SR501 Switching Relay Wiring
AT
TO: 120 VACPOWER
CIRCULATOR
JUMPER
120 VACINPUT
THERMOST
R WT T COM
24VAC
N/O N/C N/C N/ON H 3 4 4 6 6 5
TO: TT ON BOILER
SR5011 ZONE
SWITCHING RELAY
POWER
T STAT
TYPICAL WIRING(COLD START)
T
TO: 120 VAC POWER
CIRCULATOR
R WT T COM
24VAC
N/O N/C N/C N/ON H 3 4 4 6 6 5
TO: TT ON BOILER
SR5011 ZONE
SWITCHING RELAY
POWER *
T STAT *
ALTERNATIVE WIRING(24 VAC POWERED INPUT SIGNAL)
N
H
REMOVE JUMPER.DO NOT CONNECT POWERTO N AND H TERMINALS.
* T STAT LIGHT WILL GOON AND OFF WITH 24 VACSIGNAL. POWER LIGHTWILL ALWAYS BE OFF.
24 VACSIGNAL
3
SR502/503 Switching Relay Controlling Another SR502/503 Switching Relay
SR 503
24 VACPOWER
FUSE 1 AMP
ZONE1 ZONE2 ZONE3
120 VOLT CIRCULATORS
ZONE1 ZONE2 ZONE3
TO: "TT" ON AQUASTAT CONTROL
JUMPERN P ZC H X ZR1
X2
ZONE 2
POWERZONE 1
ZONE 3
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
TT T
SR 503 ZONE1 ZONE2 ZONE3
24 VACPOWER
FUSE 1 AMP
120 VOLTCIRCULATORS
ZONE1 ZONE2 ZONE3
120 VAC POWER
JUMPERN P ZC H X ZR1
X2
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
TA T
BOILER
H
N
SLAVE
MASTER
AQUASTATON DHWHEATER
ZONE 2
POWERZONE 1
ZONE 3
DHWHEATER
CIRCULATOR
PRIORITY ONVIA JUMPERPLACEMENT
PRIORITY OFFVIA JUMPERPLACEMENT
4
SR502/503 Switching Relay Controlling Another SR504/506 Switching Relay
SIX ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 6
ON
OFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VAC INPUT
TO: "TT" ON BOILER
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
FUSE 1 AMP
24 VACPOWER
SR 506
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
ZONE 5ZONE 6
THERMOSTATS
BOILER
H
N
SR 503 ZONE1 ZONE2 ZONE3
24 VACPOWER
FUSE 1 AMP
120 VOLTCIRCULATORS
ZONE1 ZONE2 ZONE3JUMPERS
N P ZC H X ZR1
X2
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
TA T
MASTER
ZONE 2
POWERZONE 1
ZONE 3
SLAVET
PRIORITY ONVIA JUMPER PLACEMENT
REMOVEJUMPER
PRIORITYOFF
AQUASTATON DHWHEATER
5
Two SR504/506 Switching Relays Connected Together
BOILER
H
N
AAQUASTAT ONDHW HEATER
TT T
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
TT T
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VACPOWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
DHWHEATER
CIRCULATOR
OUTPUTNOTUSED
PRIORITYON
PRIORITYON
6
Priority Zoning Circulator Controlling SR504/506 Switching Relay
SIX ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 6
ON
OFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VAC INPUT
TO: "TT" ON BOILER
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
FUSE 1 AMP
24 VACPOWER
SR 506
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
ZONE 5ZONE 6
ONOFF
PRIORITY
POWER IN
120 VAC INPUT
THERMOSTAT BOILER PRIORITY
PRIORITY ZONING CIRCULATOR
PR-IN PR-OUT LIVE NEUT1 2 3 4
THERMOSTATS
BOILER
H
N
A
AQUASTAT ONDHW HEATER
MASTER
SLAVE
PRIORITYON
REMOVEJUMPER
PRIORITYOFF
T
7
Priority Zoning Circulator Controlling 2 SR504/506 Switching Relays
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
TT T
BOILER
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 V
AC
POW
ER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
TT T
H
N
FOUR ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
FOUR ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
SLAVESLAVEPRIORITY
OFFPRIORITY
OFF
T T
24 V
AC
POW
ER
ONOFF
PRIORITY
POWER INTHERMOSTAT BOILER PRIORITY
PRIORITY ZONING CIRCULATOR
PR-IN PR-OUT LIVE NEUT1 2 3 4
AAQUASTAT ONDHW HEATER
120 VAC INPUT
MASTER
PRIORITYON
REMOVEJUMPER
REMOVEJUMPER
SR502/503 Switching Relay Controlling 2 SR504/506 Switching Relays
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
TT T
BOILER
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP24
VA
CPO
WER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
TT T
H
N
A
SR 503 ZONE1 ZONE2 ZONE3
24 VACPOWER
FUSE 1 AMP
ZONE1 ZONE2 ZONE3
JUMPER
N P ZC H X ZR1
X2
ZONE 2
POWERZONE 1
TWO ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
PRIORITYON
FOUR ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
FOUR ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
MASTER
SLAVESLAVEPRIORITY
OFFPRIORITY
OFF
T T
T T24
VA
CPO
WER
ZONE 3
REMOVEJUMPER
REMOVEJUMPER
AQUASTAT ONDHW HEATER
8
9
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
TT T
BOILER
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
120 VACPOWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VACINPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
TT T
H
N
T
DHWCIRCULATOR
JUMPER
R WT T COM
24VAC
N/O N/C N/C N/ON H 3 4 4 65 5
SR501POWER
T STAT
120 VAC INPUT
1 ZONE SWITCHING RELAY
AQUASTAT ON
DHW HEATERA
T
MASTER
SLAVESLAVE
REMOVEJUMPER
REMOVEJUMPER
PRIORITY OFF PRIORITY OFF
SR501 Switching Relay Controlling 2 SR504/506 Switching Relays
10
2 Expandable Switching Relays Connected Together
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504-EXP
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
BOILER
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: Off
120 VAC INPUT
H
N
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: NormalPriority Zone: On
1 2 3 4EXPANSION
1 2 3 4EXPANSION
SR504-EXP
SIX ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
ZONE 6
ONOFF
PRIORITY
120V RELAY
PLUG-IN CARDS
FUSE 1 AMP
SLAVE
MASTER
RESET NORMAL
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
TO: "TT" ON BOILER
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
SR 506-EXP
ZONE 2
POWERZONE 1
ZONE 3ZONE 4ZONE 5ZONE 6
JUMPER
DHWCIRCULATOR
THERMOSTATS
SLAVE
MASTERA
AQUASTATON DHWHEATER
T
T
11
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
POWERCONTROLINTERFACE
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504-EXP
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
BOILER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On
120 VACINPUT
H
N
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: Off
1 2 3 4EXPANSION
1 2 3 4EXPANSION
SR504-EXP
SIX ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
ZONE 6
ONOFF
PRIORITY
120V RELAY
PLUG-IN CARDS
FUSE 1 AMP
SLAVE
MASTER
RESET NORMAL
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
TO: "TT" ON BOILER
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
SR 506-EXP
ZONE 2
POWERZONE 1
ZONE 3ZONE 4ZONE 5ZONE 6
JUMPER
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504-EXP
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: Off
1 2 3 4EXPANSION
SR504-EXP
DHWCIRCULATOR
AQUASTAT ONDHW HEATERAT
T TSLAVE
MASTER
SLAVE
3 Expandable Switching Relays Connected Together
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
TT T
BOILER
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 V AC
POWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
TT T
H
N
A
JUMPERJUMPER
SR 502 ZONE1 ZONE2 ZONE3
24 VACPOWER
FUSE 1 AMP
ZONE1 ZONE2 ZONE3
JUMPERS
N P ZC H X ZR1
X2
ZONE 2
POWERZONE 1
TWO ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
A
PRIORITYOFF
FOUR ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
FOUR ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
ZONENOTUSED
ZONENOTUSED
MASTER
SLAVE SLAVEPRIORITY
ONPRIORITY
ON
AQUASTATS ONDHW HEATERS
12 2 Indirect Water Heaters with Priority Connected to Standard Switching Relays
13
BOILER
120 VAC INPUT
TO: "TT" ON BOILER
H
N
A
SR 502 ZONE1 ZONE2 ZONE3
24 VACPOWER
FUSE 1 AMP
ZONE1 ZONE2 ZONE3
JUMPERS
N P ZC H X ZR1
X2
ZONE 2
POWERZONE 1
TWO ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
A
PRIORITYOFF
1 2 3 4EXPANSION
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504-EXP
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On
1 2 3 4EXPANSION
SR504-EXP
T
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504-EXP
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: Off
SR504-EXP
T
DHWCIRCULATORS
AQUASTATS ONDHW HEATERS
MASTER SLAVE
ZONENOTUSED
2 Indirect Water Heaters with Priority Connected to EXP Switching Relays
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
1234 PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
H
N
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
BOILER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: ResetPriority Zone: On or Off
SR 504-EXP
14 PC700 Boiler Reset Control Connected to EXP Switching Relay
15
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
1234 PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPERH
N
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#2
BOILER#1
DHWDEMAND SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On or Off
SR 504-EXP
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
SYSTEMCIRCULATOR(OPTIONAL)
T
PC702 2–Stage Boiler Reset Control Connected to EXP Switching Relay
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
1234 PLUG-IN CARDS
RESET NORMAL
SLAVE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
H
N
BOILER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: ResetPriority Zone: On or Off
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
AND/OR BOILER
BLACK
BLUE
RED
GREEN/GROUND
SR 504-EXP
(SEE NOTE B)
NOTE A: WHEN SYSTEM CIRCULATOR IS CONNECTED TO ZR TERMINAL ON SWITCHING RELAY, THE MODE SWITCH MUST BE SET TO NORMAL.THE PC705-2 WILL NOT RESET THE BOILER WHEN IN THE NORMAL MODE.
NOTE B: WHEN SYSTEM CIRCULATOR IS CONNECTED TO RED WIRE ON PC705-2, THE CIRCULATOR WILL OPERATE ONLY WHEN THERMOSTAT CALLS FOR HEATAND THE OUTDOOR TEMPERATURE IS BELOW THE WARM WEATHER SHUT DOWN (WWSD) TEMPERATURE. THE WWSD CAN BE ADJUSTED OR TURNEDOFF SO THAT THE CIRCULATOR IS NOT AFFECTED BY OUTDOOR TEMPERATURE.
SYSTEMCIRCULATOR
AND/OR BOILER(SEE NOTE A)
T
16 PC705 Variable Speed Pump Injection Control Connected to EXP Switching Relay
17
PC700 Boiler Reset Control Connected to 2 EXP Switching Relays
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VACINPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
BOILER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: ResetPriority Zone: On or Off
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VACPOWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER H
N
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: No Priority
1 2 3 4EXPANSION
1 2 3 4EXPANSION
SR 504-EXP
SR 504-EXP
MASTER
SLAVE
SYSTEMCIRCULATOR(OPTIONAL)
T
T
18
PC702 2–Stage Boiler Reset Control Connected to 2 EXP Switching Relays
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On or Off
1 2 3 4EXPANSION
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#2
BOILER#1
DHWDEMAND
SR 504-EXP
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
MASTER
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPERH
N
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: No Priority
1 2 3 4EXPANSION
SR 504-EXP
SLAVE
SYSTEMCIRCULATOR(OPTIONAL)
T
T
19
PC705 Variable Speed Pump Injection Control Connected to 2 EXP Switching Relays
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VACINPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
BOILER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: ResetPriority Zone: On or Off
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPERH
N
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: No Priority
1 2 3 4EXPANSION
1 2 3 4EXPANSION
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
SR 504-EXP
SR 504-EXP
MASTER
SLAVE
SYSTEMCIRCULATOR(OPTIONAL)
(SEE NOTE A ON PAGE 16)
(SEE NOTE BON PAGE 16)
T
T
20
PC700 and PC705 Controls Connected to 2 EXP Switching Relays
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUTTO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
BOILER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: ResetPriority Zone: On or Off
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
H
N
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: No Priority
1 2 3 4EXPANSION
1 2 3 4EXPANSION
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
SYSTEM CIRCULATOR(OPTIONAL LOCATION)
(SEE NOTE A ON PAGE 16)
SR 504-EXP
SR 504-EXP
MASTER
SLAVE
JUMPER
(SEE NOTE BON PAGE 16)
T
T
21
PC702 and PC705 Controls Connected to 2 EXP Switching Relays
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
POWERCONTROLINTERFACE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On or Off
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
MASTER
PLUG-IN CARDS
RESET NORMAL
SLAVE
THERMOSTATS
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
H
N
SWITCH SETTINGS
Master/Slave: SlaveReset/Normal: NormalPriority Zone: No Priority
1 2 3 4EXPANSION
1 2 3 4EXPANSION
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
SYSTEM CIRCULATOR(OPTIONAL LOCATION)
(SEE NOTE A ON PAGE 16)
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#2
BOILER#1
DHWDEMAND
SR 504-EXP
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
SR 504-EXP
MASTER
SLAVE(SEE NOTE BON PAGE 16)
T
T
24 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
FUSE (5 A
MP M
AX
)
T T T T T T T T T T
ZVC 405
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
T STAT 1
VALVE 1
T STAT 2
VALVE 2T STAT 3VALVE 3T STAT 4
VALVE 4T STAT 5VALVE 5POWER
FIVE ZONE ZONE VALVE CONTROL
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ENDSWITCH
N/O COM N/C
TO BOILER AQUASTAT RELAYPO
WER
IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
BOILER
H
N
SYSTEMPUMP
SYSTEM PUMP AND BOILER TURN ONWHEN ANY ZONE VALVE OPENS.
T T T
22 ZVC403/405 with System Pump
23
24 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
MODENORMAL RESET
FUSE (7 A
MP M
AX
)
T T T T T T T T T T T T
ZONE 6 PRIORITY
OFF
ON
ZVC 406
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIREZONE VALVE
(POWER OPEN, SELF CLOSING)
T STAT 1
VALVE 1
T STAT 2
VALVE 2T STAT 3VALVE 3T STAT 4
VALVE 4T STAT 5VALVE 5T STAT 6VALVE 6POWER
SIX ZONE ZONE VALVE CONTROLWITH OPTIONAL PRIORITY
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
N/O COMZONE 6 RELAY
DRYCONTACTS
ENDSWITCH
EXTRAEND
SWITCH
MAIN N/C
TO BOILER AQUASTAT RELAY
BOILER
H
N
SYSTEMPUMP
A AQUASTAT ONDHW HEATER
SYSTEM PUMP AND BOILER TURN ONWHEN ANY ZONE VALVE OPENS.
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
T T T
ZVC404/406 with System Pump
24 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
MODENORMAL RESET
FUSE (7 A
MP M
AX
)
T T T T T T T T T T T T
ZONE 6 PRIORITY
OFF
ON
ZVC 406
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
T STAT 1
VALVE 1
T STAT 2
VALVE 2T STAT 3VALVE 3T STAT 4
VALVE 4T STAT 5VALVE 5T STAT 6VALVE 6POWER
SIX ZONE ZONE VALVE CONTROLWITH OPTIONAL PRIORITY
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
POW
ER IN
24 VAC F
AC
TORY
INST
ALL
EDTR
AN
SFO
RMER
120 VACINPUT
WHITE
BLACK
N/O COMZONE 6 RELAYEND
SWITCH
EXTRAEND
SWITCH
MAIN N/C
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
TO BOILER AQUASTAT RELAY
BOILER
H
N
DHWPUMP
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
A AQUASTAT ONDHW HEATER
BOILER TURNS ON WHEN ANY ZONE VALVE OPENS.
DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
T T T
24 ZVC404/406 with Domestic Hot Water (DHW) Pump
25
24 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
MODENORMAL RESET
FUSE (7 A
MP M
AX
)
T T T T T T T T T T T T
ZONE 6 PRIORITY
OFF
ON
ZVC 406
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
T STAT 1
VALVE 1
T STAT 2
VALVE 2T STAT 3VALVE 3T STAT 4
VALVE 4T STAT 5VALVE 5T STAT 6VALVE 6POWER
SIX ZONE ZONE VALVE CONTROLWITH OPTIONAL PRIORITY
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
N/O COMZONE 6 RELAYEND
SWITCH
EXTRAEND
SWITCH
MAIN N/C
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
TO BOILER AQUASTAT RELAY
BOILER
H
N
DHWPUMP
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
A AQUASTAT ONDHW HEATER
SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.
DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
SYSTEMPUMP
T T T
ZVC404/406 with System and DHW Pumps
26
24 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
MODENORMAL RESET
FUSE (7 A
MP M
AX
)
T T T T T T T T T T T T
ZONE 6 PRIORITY
OFF
ON
ZVC 406
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
T STAT 1
VALVE 1
T STAT 2
VALVE 2T STAT 3VALVE 3T STAT 4
VALVE 4T STAT 5VALVE 5T STAT 6VALVE 6POWER
SIX ZONE ZONE VALVE CONTROLWITH OPTIONAL PRIORITY
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
POW
ER IN
24 VAC F
AC
TORY
INST
ALL
EDTR
AN
SFO
RMER
120 VACINPUT
WHITE
BLACK
N/O COMZONE 6 RELAYEND
SWITCH
EXTRAEND
SWITCH
MAIN N/C
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
TO BOILER AQUASTAT RELAY
BOILER
H
N
DHWPUMP
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
A AQUASTAT ONDHW HEATER
SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.
DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
SECONDARY PUMP COMES ON WHEN ANY ZONE CALLS EXCEPT PRIORITY ZONE.
SYSTEMPUMP
SECONDARYPUMP
T T T
ZVC404/406 with System, DHW and Secondary Pumps
27
2 ZVC404/406 Connected Together with Priority
24 VAC
POWER IN
ZONE 2 ZONE 3 ZONE 4
MODENORMAL RESET
FUSE (3 A
MP M
AX
)
ZONE 1T T T T T T T T
ZONE 4 PRIORITY
OFF
ON
N/O COM N/CZONE 4 RELAY
DRYCONTACTS
1 2 3 4 1 2 3 4ZONE 1 ZONE 2
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
THERMOSTAT THERMOSTAT THERMOSTAT
1 2 3 4ZONE 3
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
T STAT 1
VALVE 1T STAT 2VALVE 2T STAT 3
VALVE 3T STAT 4VALVE 4POWER
ENDSWITCH
EXTRAEND
SWITCH
MAIN
24VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZVC 404FOUR ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
1 2 3 4ZONE 4
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
24 VAC
POWER IN
ZONE 2 ZONE 3 ZONE 4
MODENORMAL RESET
FUSE (3 A
MP M
AX
)
ZONE 1T T T T T T T T
ZONE 4 PRIORITY
OFF
ON
N/O COM N/CZONE 4 RELAY
TO BOILER AQUASTAT RELAY
DRYCONTACTS
1 2 3 4 1 2 3 4ZONE 1 ZONE 2
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
THERMOSTAT THERMOSTAT THERMOSTAT
1 2 3 4ZONE 3
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN,SELF CLOSING)
T STAT 1
VALVE 1T STAT 2VALVE 2T STAT 3
VALVE 3T STAT 4VALVE 4POWER
ENDSWITCH
EXTRAEND
SWITCH
MAIN
24VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
FOUR ZONE ZONE VALVE CONTROLWITH OPTIONAL PRIORITY
BOILER
H
N
AAQUASTAT ONDHW HEATER
PRIORITYON
PRIORITYON
TO BOILERAQUASTAT RELAY
ZVC 404
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
1 2 3 4ZONE 4
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
T T T
T T T
28
2 EXP Zone Valve Controls Connected Together with System Pump
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
24 VAC
POW
ER IN
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO BOILER AQUASTAT RELAY
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
MODENORMALRESET
2 WIREZONE VALVE
(NO END SWITCH)
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIREZONE VALVE
(POWER OPEN, SELF CLOSING)
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN 24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: Normal Priority Zone: Off
A AQUASTAT ONDHW HEATERTTT
T T T
120 VACINPUT
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
MASTER
SLAVE
SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.
SYSTEMPUMP
29
2 EXP Zone Valve Controls Connected Together with DHW Pump
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
24 VAC
POW
ER IN
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO BOILERAQUASTAT RELAY
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
MODENORMALRESET
2 WIREZONE VALVE
(NO END SWITCH)
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIREZONE VALVE
(POWER OPEN, SELF CLOSING)
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN 24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: Normal Priority Zone: Off
A AQUASTAT ONDHW HEATERTTT
T T T
120 VACINPUT
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
MASTER
SLAVE
BOILER TURNS ON WHEN ANY ZONE VALVE OPENS.DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
DHWPUMP
2 EXP Zone Valve Controls Connected Together with System and DHW Pumps
30
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
24 VACPO
WER
IN
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO BOILERAQUASTAT RELAY
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
MODENORMALRESET
2 WIREZONE VALVE
(NO END SWITCH)
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIREZONE VALVE
(POWER OPEN, SELF CLOSING)
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN 24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: Normal Priority Zone: Off
A AQUASTAT ONDHW HEATERTTT
T T T
120 VACINPUT
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
MASTER
SLAVE
SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
DHWPUMP
SYSTEMPUMP
31
2 EXP Zone Valve Controls Connected Together with System, DHW and Secondary Pumps
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
24 VAC
POW
ER IN
24 VAC FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO BOILERAQUASTAT RELAY
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
MODENORMALRESET
2 WIREZONE VALVE
(NO END SWITCH)
TACO3 WIRE
ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIREZONE VALVE
(POWER OPEN, SELF CLOSING)
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN 24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGS
Master/Slave: MasterReset/Normal: NormalPriority Zone: On
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: Normal Priority Zone: Off
A AQUASTAT ONDHW HEATERTTT
T T T
120 VACINPUT
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
MASTER
SLAVE
SYSTEM PUMP AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW PUMP TURNS ON ONLY WHEN PRIORITY ZONE CALLS.SECONDARY PUMP TURNS ON WHEN ANY ZONE CALLS, EXCEPT PRIORITY ZONE.
DHWPUMP
SYSTEMPUMP SECONDARY
PUMP
32 PC700 Boiler Reset Control Connected To EXP Zone Valve Control
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
INDIRECTWATER HEATERAQUASTATOR THERMOSTAT
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
24 VAC
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO BOILERAQUASTAT RELAY
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
SYSTEMCIRCULATOR
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: ResetPriority Zone: On or Off
SYSTEM CIRCULATOR AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.
T T T
33
PC702 2–Stage Boiler Reset Control Connected To EXP Zone Valve Control
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
INDIRECTWATER HEATERAQUASTATOR THERMOSTAT
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
24 VAC
POW
ER IN
24
VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
SYSTEMCIRCULATOR
H
N
BOILER#2
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#1
DHWDEMAND
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: NormalPriority Zone: On or Off
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
SYSTEM CIRCULATOR AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW CIRCULATOR TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
DHWCIRCULATOR
T T T
34 PC705 Variable Speed Pump Injection Control Connected To EXP Zone Valve Control
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
INDIRECTWATER HEATERAQUASTATOR THERMOSTAT
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
24 VAC
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO BOILERAQUASTAT RELAY
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
H
N
BOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
(SEE NOTE B ON PAGE 16)
BLACK
BLUE
RED
GREEN/GROUND
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: ResetPriority Zone: On or Off
SYSTEM CIRCULATOR(OPTIONAL LOCATION)
SYSTEM CIRCULATOR AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.
T T T
35
PC700 Boiler Reset Control Connected To 2 EXP Zone Valve Controls
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO BOILERAQUASTAT RELAY
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
SYSTEMCIRCULATOR
H
N
BOILER
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset Priority Zone: On or Off
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: Normal Priority Zone: Off
MASTER
SLAVE
INDIRECT WATER HEATERAQUASTAT OR THERMOSTAT
24 VAC
TTT
24 VAC
TTT
SYSTEM CIRCULATOR AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW CIRCULATOR TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
DHWCIRCULATOR
36
PC702 2–Stage Boiler Reset Control Connected To 2 EXP Zone Valve Controls
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACKN/O COM
ZONE 6 RELAYN/C
ENDSWITCH
APUMP
ENDSWITCH
BBOILER
SYSTEMCIRCULATOR
H
N
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24
VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
BOILER#2
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#1
DHWDEMAND
24
VAC
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Normal Priority Zone: On or Off
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: NormalPriority Zone: Off
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
MASTER
SLAVE
INDIRECT WATER HEATERAQUASTAT OR THERMOSTAT
24 VAC
TTT
24 VAC
TTT
SYSTEM CIRCULATOR AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW CIRCULATOR TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
DHWCIRCULATOR
37
PC705 Variable Speed Pump Injection Control Connected To 2 EXP Zone Valve Controls
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ERWHITE
BLACK
TO BOILERAQUASTAT RELAY
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
H
N
BOILER
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ERWHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
SWITCH SETTINGSMaster/Slave: Master Reset/Normal: ResetPriority Zone: On or Off
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: NormalPriority Zone: Off
SYSTEM CIRCULATOR(OPTIONAL LOCATION)
MASTER
SLAVE
INDIRECT WATER HEATERAQUASTAT OR THERMOSTAT
24 VAC
TTT
24 VAC
TTT
(SEE NOTE B ON PAGE 16)
38
PC700 and PC705 Connected To 2 EXP Zone Valve Controls
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO BOILERAQUASTAT RELAY
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC700
SYSTEMCIRCULATOR
H
N
BOILER
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Reset Priority Zone: On or Off
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: Normal Priority Zone: Off
MASTER
SLAVE
INDIRECT WATER HEATERAQUASTAT OR THERMOSTAT
24 VAC
TTT
24 VAC
TTT
SYSTEM CIRCULATOR AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW CIRCULATOR TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
DHWCIRCULATOR
(SEE NOTE B ON PAGE 16)
39
PC702 and PC705 Connected To 2 EXP Zone Valve Controls
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACKN/O COM
ZONE 6 RELAYN/C
ENDSWITCH
APUMP
ENDSWITCH
BBOILER
SYSTEMCIRCULATOR
H
N
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
BOILER#2
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC702
STAGE1
STAGE2
BOILER#1
DHWDEMAND
24
VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVEPOWER
CONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTROL
WITH OPTIONAL PRIORITY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
PUMP
ENDSWITCH
BBOILER
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ZONECONTROL
BOILSEN
OUTSEN
BOILER SENSOR
OUTDOORSENSOR
PC705-2
SUPSEN
SUPPLY SENSOR
INJECTIONCIRCULATOR
SYSTEMCIRCULATOR
BLACK
BLUE
RED
GREEN/GROUND
Note: When a circulator is used on thepriority zone instead of a zone valve,jumper 3 and 4 of the priority zone.
SWITCH SETTINGSMaster/Slave: MasterReset/Normal: Normal Priority Zone: On or Off
SWITCH SETTINGSMaster/Slave: SlaveReset/Normal: Normal Priority Zone: Off
WIRING NEEDED ONLY IFPRIORITY ZONE IS DHW
MASTER
SLAVE
INDIRECT WATER HEATERAQUASTAT OR THERMOSTAT
24 VAC
TTT
24 VAC
TTT
SYSTEM CIRCULATOR AND BOILER TURN ON WHEN ANY ZONE VALVE OPENS.DHW CIRCULATOR TURNS ON ONLY WHEN PRIORITY ZONE CALLS.
DHWCIRCULATOR
(SEE NOTE B ON PAGE 16)
40
HAFC101 with 1 Speed Air Handler
HAFC 101 WITH 1 SPEED AIR HANDLER(Both HFC 101 and HAFC 201 are
capable of 1 and 2 speed applications.)
THERMOSTAT
Optional Power Wireto Thermostatthat Requires 24VAC
To: Aquastat onReturn Line ofHydro Coil
Dry Contacts To:“T T” on Boileror Switching Relay
Power OnCall for HeatFan, CoolingFan, Heating
OutdoorCondenserUnit
T T
BOILER AIR HANDLER
G GX X C R Y
C R GY TWTHERMOSTAT AQUASTAT
HAFC101HYDRO AIR FAN CONTROL
Jumper
M
FanRelay
Line
24 V
AC
LOW HIGH
T
41
HAFC101 with 2 Speed Air Handler
HAFC 101 WITH 2 SPEED AIR HANDLER(Both HFC 101 and HAFC 201 are
capable of 1 and 2 speed applications.)
THERMOSTAT
Optional Power Wireto Thermostatthat Requires 24VAC
To: Aquastat onReturn Line ofHydro Coil
Dry Contacts To:“T T” on Boileror Switching Relay
Power OnCall for HeatFan, CoolingFan, Heating
OutdoorCondenserUnit
T T
BOILER AIR HANDLER
G GX X C R Y
C R GY TWTHERMOSTAT AQUASTAT
HAFC101HYDRO AIR FAN CONTROL
M
Low
Hig
h
Line
24 V
AC
Fan
Rela
ys
LOW HIGH
T
42
HAFC201 with 1 Speed Air Handler
M
FanRelay
Line
24 V
AC
THERMOSTAT
Optional Power Wireto Thermostatthat Requires 24VAC
To: OptionalAquastat onReturn Line ofHydro Coil
Power OnCall for HeatFan, CoolingFan, Heating
OutdoorCondenserUnit
T T
BOILER AIR HANDLER
G GX X C R Y
C R GYWTHERMOSTAT AQUASTATS
HAFC201HYDRO AIR FAN CONTROL
TTWATER COIL FREEZE PR
To: Optional Aquastator Thermostat to senselow ambienttemperature
Hot
Neutral
Circulator
XXPUMP
5 AMP 1/6 HP RATEDDRY CONTACTS
1 MIN
ON
DELA
Y - FAN
3 MIN
ON
DELA
Y - FAN
2 MIN
@ 24 H
R - PUM
P30 SEC
@ 2 W
K - PUM
P
OFF O
N
Jumper
(or to “T T” onswitching relay)
HAFC 201 WITH 1 SPEED AIR HANDLER(Both HFC 101 and HAFC 201 are
capable of 1 and 2 speed applications.)
Dry Contacts To:“T T” on Boileror SwitchingRelay
LOW HIGH
T
NOTE: For 4 minuteon delay of Heating Fan,switch 1 and 3 MIN ONDELAY to ON position.
43
HAFC201 with 2 Speed Air Handler
THERMOSTAT
Optional Power Wireto Thermostatthat Requires 24VAC
To: OptionalAquastat onReturn Line ofHydro Coil
Power OnCall for HeatFan, CoolingFan, Heating
OutdoorCondenserUnit
T T
BOILER AIR HANDLER
G GX X C R Y
C R GYWTHERMOSTAT AQUASTATS
HAFC201HYDRO AIR FAN CONTROL
TTWATER COIL FREEZE PR
To: Optional Aquastator Thermostat to senselow ambienttemperature
Hot
Neutral
Circulator
XXPUMP
5 AMP 1/6 HP RATEDDRY CONTACTS
1 MIN
ON
DELA
Y - FAN
3 MIN
ON
DELA
Y - FAN
2 MIN
@ 24 H
R - PUM
P30 SEC
@ 2 W
K - PUM
P
OFF O
N
(or to “T T” onswitching relay)
HAFC 201 WITH 2 SPEED AIR HANDLER(Both HFC 101 and HAFC 201 are
capable of 1 and 2 speed applications.)
“T T” on Boileror SwitchingRelay M
Low
Hig
h
Line
24 V
AC
Fan
Rela
ys
LOW HIGH
T
NOTE: For 4 minuteon delay of Heating Fan,switch 1 and 3 MIN ONDELAY to ON position.
44 Multiple HAFC’s and Switching Relay
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VACPOWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
BOILER
H
N
SR 504
DHWHEATER
AQUASTAT
THERMOSTAT
POWER PMCALL FOR HEATFAN, COOLINGFAN, HEATING
OUTDOORCONDENSER
UNIT
T T
BOILER AIR HANDLER
G GX X C R Y
C R GY TWTHERMOSTAT AQUASTAT
HAFC101HYDRO AIR FAN CONTROL
M
Low
Hig
h
Line
24 V
AC
Fan
Rela
ys
LOW HIGH
THERMOSTAT
T T
BOILER AIR HANDLER
G GX X C R Y
C R GY TWTHERMOSTAT AQUASTAT
HAFC101HYDRO AIR FAN CONTROL
M
Low
Hig
h
Line
24 V
AC
Fan
Rela
ys
LOW HIGH
2 SPEED AIR HANDLER
THERMOSTAT
T T
BOILER AIR HANDLER
G GX X C R Y
C R GY TWTHERMOSTAT AQUASTAT
HAFC101HYDRO AIR FAN CONTROL
M
Low
Hig
h
Line
24 V
AC
Fan
Rela
ys
LOW HIGH
OPTIONAL POWER WIRETO THERMOSTAT
THAT REQUIRES 24VAC
OPTIONAL POWER WIRETO THERMOSTAT
THAT REQUIRES 24VAC
OPTIONAL POWER WIRETO THERMOSTAT
THAT REQUIRES 24VAC
TO: AQUASTAT ONRETURN LINE OF
HYDRO COIL
TO: AQUASTAT ONRETURN LINE OF
HYDRO COIL
TO: AQUASTAT ONRETURN LINE OF
HYDRO COIL
OUTDOORCONDENSER
UNIT
OUTDOORCONDENSER
UNIT
2 SPEED AIR HANDLER2 SPEED AIR HANDLER
POWER PMCALL FOR HEATFAN, COOLINGFAN, HEATING
POWER PMCALL FOR HEATFAN, COOLINGFAN, HEATING
T T T
45
3 Wire Thermostat Connected to TACO Switching Relay
BOILER
H
N
TT
T
FOUR ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 4
ONOFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VACPOWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
JUMPER
T
W R
COM
3 WIRETHERMOSTAT
46 3 Wire Thermostat Connected to TACO Zone Valve Control
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5T T T T T T T T T T
ZVC 405
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
3 WIRE ZONE VALVE(TACO TYPE)
123
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(HONEYWELL TYPE)
T STAT 1
VALVE 1
T STAT 2
VALVE 2T STAT 3VALVE 3T STAT 4
VALVE 4T STAT 5VALVE 5POWER
FIVE ZONE ZONE VALVE CONTROL
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ENDSWITCH
TT
TO T&T ON BOILEROR PUMP RELAY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
BLA
CK
RED
BLA
CK
RED
WH
RED
CO
MM
ON
W RC
T T T
47
White-Rogers 1361 Hydronic Zone Valve with TACO Zone Valve Control
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5T T T T T T T T T T
ZVC 405
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
WHITE-ROGERS 1361HYDRONIC ZONE VALVE
3
3 WIRE ZONE VALVE(TACO TYPE)
123
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(HONEYWELL TYPE)
T STAT 1
VALVE 1
T STAT 2
VALVE 2T STAT 3VALVE 3T STAT 4
VALVE 4T STAT 5VALVE 5POWER
FIVE ZONE ZONE VALVE CONTROL
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ENDSWITCH
TT
TO T&T ON BOILEROR PUMP RELAY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
BLA
CK
RED
BLA
CK
RED
RIGHT TTSCREW
(SEE NOTE)
412
NOTE: WHEN USING ZVC 404 OR ZVC 406,CONNECT WIRE #2 OF ZONE VALVETO PRIORITY ZONE RIGHT TT SCREW
T T T
3
TERMINAL ASSIGNMENTZONE VALVE CONTROL
1 123
TT (Rt)
4 2
48 Honeywell VC 40 & 80 (spdt) Hydronic Zone Valve with TACO Zone Valve Control
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5T T T T T T T T T T
ZVC 405
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
HONEYWELL VC (SPST)HYDRONIC ZONE VALVE
SERIES 40 & 80
1
3 WIRE ZONE VALVE(TACO TYPE)
123
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(HONEYWELL TYPE)
T STAT 1
VALVE 1
T STAT 2
VALVE 2T STAT 3VALVE 3T STAT 4
VALVE 4T STAT 5VALVE 5POWER
FIVE ZONE ZONE VALVE CONTROL
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ENDSWITCH
TT
TO T&T ON BOILEROR PUMP RELAY
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
BLA
CK
RED
BLA
CK
RED
RIGHT TTSCREW
(SEE NOTE)
4623
NOTE: WHEN USING ZVC 404 OR ZVC 406,CONNECT WIRE #3 OF ZONE VALVETO PRIORITY ZONE RIGHT TT SCREW
T T T
TERMINAL ASSIGNMENTZONE VALVE CONTROLORANGE 1 3BLUE 2BROWN 3
1
GRAY 4 4BLACK 6 2
TT (Rt)
570 Zone Valve to Switching Relay
SR 503 ZONE1 ZONE2 ZONE3
24 VACPOWER
FUSE 1 AMP
120 VOLTCIRCULATORS
ZONE1 ZONE2 ZONE3JUMPERS
N P ZC H X ZR1
X2
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
ZONE 2
POWERZONE 1
ZONE 3
TO: 120 VAC POWER (NEUTRAL)
TO: 120 VAC POWER (HOT)
TO: "TT" ON AQUASTAT CONTROL
TO: "TT" ON AQUASTAT CONTROL
T
1
2
3
24 VACTRANSFORMER
THERMOSTAT
49
Zone Valve Control with 1 Low Temperature Zone Using Priority Zoning Circulator
24 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
MODENORMAL RESET
FUSE (7 A
MP M
AX
)
T T T T T T T T T T T T
ZONE 6 PRIORITY
OFF
ON
ZVC 406
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
JUMPER3 & 4
TACO3 WIRE
ZONE VALVE
123
ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIREZONE VALVE
(POWER OPEN,SELF CLOSING)
T STAT 1
VALVE 1
T STAT 2
VALVE 2T STAT 3VALVE 3T STAT 4
VALVE 4T STAT 5VALVE 5T STAT 6VALVE 6POWER
SIX ZONE ZONE VALVE CONTROLWITH OPTIONAL PRIORITY
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
N/O COMZONE 6 RELAY
DRYCONTACTS
ENDSWITCH
EXTRAEND
SWITCH
MAIN N/C
TO BOILER AQUASTAT RELAY
BOILER
H
N
SYSTEMPUMP
A AQUASTAT ONDHW HEATER
SYSTEM PUMP AND BOILER TURN ONWHEN ANY ZONE VALVE OPENS.
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
Note: When a circulator isused on the priority zoneinstead of a zone valve,jumper 3 and 4 of thepriority zone.
T T T
MOTORMOTOR ENDSWITCH
4 WIREZONE VALVE
(POWER OPEN,SELF CLOSING)
ONOFF
PRIORITYPOWER IN
120 VAC INPUT
THERMOSTAT BOILER PRIORITY
PRIORITY ZONING CIRCULATOR
PR-IN PR-OUT LIVE NEUT1 2 3 4
PRIORITYON
50
51
TACO SR501 REPLACEMNENT CROSS-REFERENCE
MANUFACTURER MODEL CONNECTIONS
Taco SR501 H N 3 4 NO 4 NC 5 6 NO 6 NC R/T W/T C
Argo AR821 1 2 3 4 5 6 T
AR822 L1 L2 3 4 NO 4 NC 5 6 NO 6 NC R/T G/T C
Colombus MR10 L1 L2 3 4 NO 4 NC 5 6 NO 6 NC R/T G/T C
Erie SR100 L1 L2 3 4 NO 4 NC 5 6 NO 6 NC R/T G/T C
Honeywell RA89A 1 2 3 4 T T
RA832A 1 2 3 4 X X T T
R845A 1 2 3 4 5 6 T T
White-Rogers 889-189 1 2 3 4 T T
829-845 1 2 3 4 5 6 T T
Features:External Indicator LightsUniversal ReplaceabilitySnap-in PC BoardSimplified WiringFully Enclosed Snap-Out Relays100% Factory TestedContractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL ApprovedExtended 3 Year WarrantyMade in the USA
Operation:Connect a thermostat to the “T T” terminals onthe switching relay. When the thermostat calls forheat, the relay is energized and power is given to thecirculator.
Power Input:Connect 120 volt ac power to terminals N and H.
Jumper Placement:The jumper is factory installed between terminals Hand 3 to switch power on terminals 4 n/o and 4 n/c.
External Diagnostics:The External lights show full functionality of theswitching relay. The green light should always be on,indicating that power is connected. When the ther-mostat calls for heat, both the appropriate circulatorand red indicating light is energized.
The Taco Connection:Combine the reliability of the Taco Zone Valves,Priority Zoning Circulators, Thermostats, and the “00”family of circulators with the advanced features of theTaco Zone Controls to achieve total system integra-tion. No matter the application, Taco now providesthe products to maximize system performance whilesimplifying both installation and service.
Warning:Wiring connections must be made in accordance with all applicable electrical codes.Use copper wire only. Failure to follow this instruction can result in personal injury ordeath and/or property damage. 10-18 gauge wire recommended for 120 VAC connec-tions with 9 in.lbs. max torque, 12-22 gauge wire for thermostat connections with9 in.lbs. max torque, and 12-22 gauge wire for 24 VAC source with 5 in.lbs. max torque.
TypicalWiring
AlternativeWiring
AT
TO: 120 VAC POWERCIRCULATOR
JUMPER
120 VACINPUT
THERMOST
R WT T COM
24VAC
N/O N/C N/C N/ON H 3 4 4 6 6 5
TO: ZC
SR5011 ZONE SWITCHING RELAY
POWER
T STAT
TO: ZR
AT
TO: 120 VAC POWERCIRCULATOR
JUMPER
120 VACINPUT
THERMOST
R WT T COM
24VAC
N/O N/C N/C N/ON H 3 4 4 6 6 5
TO: TT ON BOILER
SR5011 ZONE SWITCHING RELAY
POWER
T STAT
Terminal Description:T & T Thermostat ConnectionCOM Common side of transformer, to power some setback thermostatsN Neutral wire of power inputH Hot wire of power input3 Common terminal for 4 n/o and 4 n/c4 n/o Normally open terminal4 n/c Normally closed terminal6 n/c Normally closed terminal6 n/o Normally open terminal5 Common terminal for 6 n/o and 6 n/c
Specifications:PRODUCT NUMBER TRANSFORMER MAXIMUM DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR501 1 Zone 120 VAC Input 7.2 amps 4 1/4" 5 1/4" 2 3/4"
All Switching Relays are relay type DPDT, have a thermostat current of .18, and have a singlephase motor rating per zone of 1/3 hp (7.2A) @ 120 VAC.
Instruction SheetSR501 Switching Relay
Do it Once. Do it Right.TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2000
TACO, Inc.
52
TACO SR501-845RP REPLACEMENT CROSS-REFERENCE
MANUFACTURER MODEL CONNECTIONS
Taco SR501-845RP L1 L2 3 4 5 6 R/T W/T
Argo AR821 1 2 3 4 5 6 T
AR822 L1 L2 3 4 NO 5 6 NO R/T G/T
Colombus MR10 L1 L2 3 4 NO 5 6 NO R/T G/T
Erie SR100 L1 L2 3 4 NO 5 6 NO R/T G/T
Honeywell RA89A 1 2 3 4 T T
RA832A 1 2 3 4 X X T T
R845A 1 2 3 4 5 6 T T
White-Rogers 889-189 1 2 3 4 T T
829-845 1 2 3 4 5 6 T T
Features:Universal ReplaceabilityIndicator LightsSnap-in PC Board to Existing EnclosureSimplified WiringFully Enclosed Snap-Out Relay100% Factory TestedUniversal Thermostat CompatibilityUL ApprovedExtended 3 Year WarrantyMade in the USA
Operation:Connect a thermostat to the “T T” terminals onthe switching relay. When the thermostat calls forheat, the relay is energized and power is given tothe circulator.
Power Input:Connect 120 volt ac power to terminals L1 and L2.
Jumper Placement:The jumper is factory installed between terminalsL1 and 3 to switch power on terminal 4.
Diagnostics:The Indicator lights show full functionality of theswitching relay. The green light should always beon, indicating that power is connected. When thethermostat calls for heat, both the appropriate cir-culator and red indicating light is energized.
The Taco Connection:Combine the reliability of the Taco Zone Valves,Priority Zoning Circulators, Thermostats, and the“00” family of circulators with the advanced featuresof the Taco Zone Controls to achieve total systemintegration. No matter the application, Taco now pro-vides the products to maximize system performancewhile simplifying both installation and service.
TypicalWiring
AlternativeWiring
TO: ZR
TO: ZC
THERMOSTAT
JUMPER
TO: 120 VAC POWER
INPUT
R WT T
L2 L1 3 4 5 6
120 VAC
POWER
T STATUNIVERSAL REPLACEMENT RELAY MODEL: SR501-845RP
REPL
AC
ES H
ON
EYW
ELL
R845
, RA
89A
& R
A83
2O
R C
OM
PARA
BLE
RELA
Y
CIRCULATOR
THERMOSTAT
TO: 120 VAC POWER
CIRCULATOR
TO: TT ON BOILER
JUMPER
R WT T
L2 L1 3 4 5 6
120 VACINPUT
POWER
T STATUNIVERSAL REPLACEMENT RELAY MODEL: SR501-845RP
REPL
AC
ES H
ON
EYW
ELL
R845
, RA
89A
& R
A83
2O
R C
OM
PARA
BLE
RELA
Y
Terminal Description:T & T Thermostat ConnectionL2 Neutral wire of power inputL1 Hot wire of power input3 Common terminal for 44 Normally open terminal6 Normally open terminal5 Common terminal for 6
Specifications:PRODUCT NUMBER TRANSFORMER MAXIMUM DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR501-845RP 1 Zone 120 VAC Input 7.2 amps 4 1/4" 5 1/4" 2 3/4"
All Switching Relays are relay type DPDT, have a thermostat current of .18, and have a single phase motor rating per zone of 1/3 hp (7.2A) @ 120 VAC.
Instruction SheetSR501-845RP Universal Replacement Relay
Warning:Wiring connections must be made in accordance with all applicable electrical codes.Use copper wire only. Failure to follow this instruction can result in personal injury ordeath and/or property damage. 10-18 gauge wire recommended for 120 VAC connec-tions with 9 in.lbs. max torque, 12-22 gauge wire for thermostat connections with9 in.lbs. max torque, and 12-22 gauge wire for 24 VAC source with 5 in.lbs. max torque.
Do it Once. Do it Right.TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 1999
TACO, Inc.
53
Do it Once. Do it Right.TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 1999
TACO, Inc.
SR 503
24 VACPOWER
FUSE 1 AMP
THERMOSTATS
ZONE1 ZONE2 ZONE3
120 VOLTCIRCULATORS
ZONE1 ZONE2 ZONE3
TO: "TT" ON AQUASTAT CONTROL
TO: "TT" ON AQUASTAT CONTROL
TO: 120 VAC POWER (HOT)
TO: 120 VAC POWER (NEUTRAL)
JUMPERSN P ZC H X ZR1
X2
ZONE 2
POWERZONE 1
ZONE 3
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
SR 503
24 VACPOWER
FUSE 1 AMP
THERMOSTATS
ZONE1 ZONE2 ZONE3
120 VOLTCIRCULATORS
TO: 120 VAC POWER (HOT)
TO: 120 VAC POWER (NEUTRAL)
TO: "ZC" ON AQUASTAT CONTROL
TO: "ZR" ON AQUASTAT CONTROL
ZONE1 ZONE2 ZONE3JUMPERS
N P ZC H X ZR1
X2
ZONE 2
POWERZONE 1
ZONE 3
THREE ZONE SWITCHING RELAYWITH OPTIONAL PRIORITY
Cold Start Boiler Application
Tankless Coil Boiler Application
Specifications:PRODUCT NUMBER TRANSFORMER MAXIMUM DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR502 2 with Priority 120 VAC Input 15 amps 10 1/4" 6 3/4" 2 3/4"SR503 3 with Priority 120 VAC Input 15 amps 10 1/4" 6 3/4" 2 3/4"
All Switching Relays are relay type DPST, have a thermostat current of .18, and have a single phase motor rating per zone of 1/3 hp (7.2A) @ 120 VAC.
Features: External Indicator LightsPrioritySimplified WiringFully Enclosed Snap-Out RelaysCompact DesignFuse Protected100% Factory TestedIsolated End SwitchContractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL Approved24 volt Power Input or Output TerminalExtended 3 Year WarrantyMade in the USA
The Taco Connection:Combine the reliability of the Taco Zone Valves, Priority ZoningCirculators, Thermostats, and the “00” family of circulators with theadvanced features of the Taco Zone Controls to achieve total systemintegration. No matter the application, Taco now provides the productsto maximize system performance while simplifying both installationand service.
External Diagnostics:Externally visible lights show full functionality of the switching relay.The green light should always be on, indicating that power is connect-ed. When the thermostat calls for heat, both the appropriate circulatorand red indicating light is energized.
Warning:Wiring connections must be made in accordance with all applicable electrical codes. Use copper wire only.Failure to follow this instruction can result in personal injury or death and/or property damage. 10-18 gaugewire recommended for 120 VAC connections with 9 in.lbs. max torque, 12-22 gauge wire for thermostat
Instruction SheetSR502 & SR503 Switching Relay
Operation: When the thermostat calls for heat, the appropriate circu-lator is energized and the isolated end switch (X1 and X2) will start theboiler.
Jumper Placement: The jumper should be placed between terminalsZC and H. Connect the isolated end switch, X1 and X2 to the boileraquastat control. For zone 1 priority, remove jumper betweenterminals P and ZC.
Power Input: Connect 120 volt ac power input to terminals N and H.Neutral wire to terminal N. Hot wire to terminal H.
Operation: When any thermostat calls for heat, the boiler is given asignal to start. The appropriate circulator is energized only when theboiler temperature is above the set low limit.
Jumper Placement: The jumper should be placed between terminalsH and X1. Connect terminal ZC to ZC terminal on the aquastat control.Connect terminal ZR to ZR terminal on the aquastat control. Confirmpolarity is consistent between boiler aquastat and switching relay. Forzone 1 priority, remove jumper between terminalsP and ZC.
Power Input: Connect 120 volt ac power input to terminals N and H.Neutral wire to terminal N. Hot wire to terminal H.
54
SIX ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 6
ON
OFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VAC INPUT
TO: "TT" ON BOILER
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
THERMOSTATS
FUSE 1 AMP
24 VACPOWER
SR 506
ZONE 2
POWERZONE 1
ZONE 3ZONE 4
ZONE 5ZONE 6
JUMPER
SIX ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 6
ON
OFF
PRIORITY
120V RELAY
TO: "ZR" ON AQUASTAT
TO: "ZC" ON AQUASTAT
FUSE 1 AMP
24 VACPOWER
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VAC INPUT
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
THERMOSTATS
SR 506
ZONE 2
POWERZONE 1
ZONE 3
ZONE 4
ZONE 5ZONE 6
Operation: When any thermostat calls for heat, the appropriate circu-lator is energized and the isolated end switch (X and X) will start theboiler.
Priority Operation: When zone 6 is switched to the priority settingand is actuated, all other zones will stop operation until zone 6 is sat-isfied. When zone 6 is not switched to priority, all zones will operateindependently.
Jumper Placement: The jumper should be placed between terminalsZC and ZR. Connect the isolated end switch to the aquastat control onthe boiler.
Power Input: Connect 120 volt ac power input to terminals N and H.Neutral wire to terminal N. Hot wire to terminal H.
Operation: When any thermostat calls for heat, the boiler is given asignal to start. The appropriate circulator is energized only when theboiler temperature is above the set low limit.
Priority Operation: When zone 6 is switched to the priority settingand is actuated, all other zones will stop operation until zone 6 is sat-isfied. When zone 6 is not switched to priority, all zones will operateindependently.
Jumper Placement: REMOVE the jumper between terminals ZC andZR. Connect terminal ZC to ZC terminal on the aqua-stat control.Connect terminal ZR to ZR terminal on the aqua-stat control. Confirmpolarity is consistent between boiler aquastat and switching relay.
Power Input: Connect 120 volt ac power input to terminals N and H.Neutral wire to terminal N. Hot wire to terminal H.
The Taco Connection:Combine the reliability of the Taco Zone Valves, Priority ZoningCirculators, Thermostats, and the “00” family of circulators with theadvanced features of the Taco Zone Controls to achieve total systemintegration. No matter the application, Taco now provides the productsto maximize system performance while simplifying both installationand service.
External Diagnostics:Externally visible lights show full functionality of the switching relay.The green light should always be on, indicating that power is connected.When the thermostat calls for heat, both the appropriate circulator andred indicating light is energized.
Warning:Wiring connections must be made in accordance with all applicable electrical codes. Use copper wire only.Failure to follow this instruction can result in personal injury or death and/or property damage. 10-18 gaugewire recommended for 120 VAC connections with 9 in.lbs. max torque, 12-22 gauge wire for thermostatconnections with 9 in.lbs. max torque, and 12-22 gauge wire for 24 VAC source with 5 in.lbs. max torque.
Cold Start BoilerApplication
Tankless Coil BoilerApplication
Specifications:PRODUCT NUMBER TRANSFORMER MAXIMUM DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR504 4 with Priority 120 VAC Input 20 amps 10 1/4" 6 3/4" 2 3/4"SR506 6 with Priority 120 VAC Input 20 amps 11 3/4" 7 1/2" 3"
All Switching Relays are relay type DPST, have a thermostat current of .18, and have a single phase motor rating per zone of 1/3 hp (7.2A) @ 120 VAC.
Instruction SheetSR504 & SR506 Switching Relay
Features: External Indicator LightsSwitchable PrioritySimplified WiringFully Enclosed Snap-Out RelaysCompact DesignFuse Protected100% Factory TestedIsolated End SwitchContractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL Approved24 volt Power Input or Output TerminalExtended 3 Year WarrantyMade in the USA
Do it Once. Do it Right.TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 1999
TACO, Inc.
55
SIX ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 6
ONOFF
PRIORITY
120V RELAY
PLUG-IN CARDS
FUSE 1 AMP
24 VACPOWER
EXPANSIONCONNECTIONS
SLAVE
MASTER
1234
RESET NORMAL
POWERCONTROLINTERFACE
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWERINPUT
120 VAC INPUTTO: "TT" ON BOILER
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
THERMOSTATS
SR 506-EXP
ZONE 2
POWERZONE 1
ZONE 3ZONE 4ZONE 5ZONE 6
JUMPER
SIX ZONE SWITCHING RELAY WITH OPTIONAL PRIORITY
ZONE 6
ONOFF
PRIORITY
120V RELAY
PLUG-IN CARDS
FUSE 1 AMP
24 VACPOWER
EXPANSIONCONNECTIONS
SLAVE
MASTER
1234
RESET NORMAL
TO: "ZC" ON AQUASTAT
TO: "ZR" ON AQUASTAT
POWERCONTROLINTERFACE
120 VOLT CIRCULATORSZC ZR
X XEND
SWITCH
POWER
INPUT
120 VAC INPUT
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
THERMOSTATS
SR 506-EXP
ZONE 2
POWERZONE 1
ZONE 3ZONE 4ZONE 5ZONE 6
Operation: When any thermostat calls for heat, the appropriate circulator isenergized and the isolated end switch (X and X) will start the boiler.
Priority Operation: When zone 6 is switched to the priority setting and is actu-ated, all other zones will stop operation until zone 6 is satisfied. When zone 6 isnot switched to priority, all zones will operate independently.
Mode Operation: When the mode switch is set to NORMAL, the end switchrelay will be energized if any zone is in operation. When the switch is set toRESET, the end switch relay will only be energized if priority zone is in operation,or through the operation of a plug-in reset control.
Jumper Placement: The jumper should be placed between terminals ZC and ZR.Connect the isolated end switch to the aquastat control on the boiler.
Power Input: Connect 120 volt ac power input to terminals N and H. Neutralwire to terminal N. Hot wire to terminal H.
Expansion Connections: Set the expansion switch to MASTER on the switchingrelay that has the designated priority zone or is utilizing the PowerPort options.Set all other daisy chained controls to SLAVE. Connect thermostat wire (18-22gauge) between terminals 1, 2, 3, 4 on the master control to the corresponding1, 2, 3, 4 on the SLAVE control(s). Controls may be daisy chained up to 20 zonesusing any combination of -EXP controls.
Operation: When any thermostat calls for heat, the boiler is given a signal tostart. The appropriate circulator is energized only when the boiler temperature isabove the set low limit.
Priority Operation: When zone 6 is switched to the priority setting and is actu-ated, all other zones will stop operation until zone 6 is satisfied. When zone 6 isnot switched to priority, all zones will operate independently.
Mode Operation: When the mode switch is set to NORMAL, the end switchrelay will be energized if any zone is in operation. When the switch is set toRESET, the end switch relay will only be energized if priority zone is in operation,or through the operation of a plug-in reset control.
Jumper Placement: REMOVE the jumper between terminals ZC and ZR.Connect terminal ZC to ZC terminal on the aqua-stat control. Connect terminalZR to ZR terminal on the aqua-stat control. Confirm polarity is consistentbetween boiler aquastat and switching relay.
Power Input: Connect 120 volt ac power input to terminals N and H. Neutralwire to terminal N. Hot wire to terminal H.
Expansion Connections: Set the expansion switch to MASTER on the switchingrelay that has the designated priority zone or is utilizing the PowerPort options.Set all other daisy chained controls to SLAVE. Connect thermostat wire (18-22gauge) between terminals 1, 2, 3, 4 on the master control to the corresponding1, 2, 3, 4 on the SLAVE control(s). Controls may be daisy chained up to 20 zonesusing any combination of -EXP controls.
External Diagnostics: Externally visible lights show full functionality of theswitching relay. The green light should always be on, indicating that power isconnected. When the thermostat calls for heat, both the appropriate circulatorand red indicating light is energized.
Warning: Wiring connections must be made in accordance with all applicable electrical codes. Use copper wire only. Failure to follow this instruction can result in personal injury or death and/or propertydamage. 10-18 gauge wire recommended for 120 VAC connections with 9 in.lbs. max torque, 12-22 gauge wire for thermostat connections with 9 in.lbs. max torque, and 12-22 gauge wire for 24 VAC source with5 in.lbs. max torque.
Cold Start Boiler Application
Tankless Coil Boiler Application
Specifications:PRODUCT NUMBER POWER TRANSFORMER MAXIMUM DIMENSIONS OF ENCLOSURENUMBER OF ZONES PORTS VOLTAGE COMBINED LOAD WIDTH HEIGHT DEPTH
SR503-EXP 3 with Priority 3 120 VAC Input 20 amps 10 1/4" 6 3/4" 2 3/4"SR504-EXP 4 with Priority 3 120 VAC Input 20 amps 10 1/4" 6 3/4" 2 3/4"SR506-EXP 6 with Priority 3 120 VAC Input 20 amps 11 3/4" 7 1/2" 3"
All Switching Relays are relay type DPST, have a thermostat current of .18, and have a single phase motor rating per zone of 1/3 hp (7.2A) @ 120 VAC.
Instruction SheetSR503-EXP, SR504-EXP & SR506-EXP Switching Relay
Features: External Indicator Lights
Plug-In PowerPort CardsSwitchable PrioritySimplified WiringAdd-On Power ControlsFully Enclosed Snap-Out
RelaysCompact DesignFuse Protected100% Factory Tested
Isolated End SwitchExpandable to 20 ZonesContractor Friendly PC Board
LayoutUniversal ThermostatCompatibilityUL Approved24 volt Power Input or Output
TerminalExtended 3 Year WarrantyMade in the USA
Do it Once. Do it Right.TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 1999
TACO, Inc.
56
24 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
FUSE (5 A
MP M
AX
)
T T T T T T T T T T
ZVC 405
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
T STAT 1
VALVE 1
T STAT 2
VALVE 2T STAT 3VALVE 3T STAT 4
VALVE 4T STAT 5VALVE 5POWER
FIVE ZONE ZONE VALVE CONTROL
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
ENDSWITCH
N/O COM N/C
TT
TO CIRCULATOROR BOILERAQUASTAT RELAY
DRYCONTACTS
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
Operation/External Diagnostics: When any thermostatcalls for heat, the appropriate zone valve is energized andthe yellow light goes on. When the zone valve is fullyopen, the red light goes on and energizes the end switchrelay. The green light should always be on, indicating thatpower is connected.
The Taco Connection: Combine the reliability of the TacoZone Valves, Priority Zoning Circulators, Thermostats, andthe “00” family of circulators with the advanced features ofthe Taco Zone Controls to achieve total system integra-tion. No matter the application, Taco now provides theproducts to maximize system performance while simplify-ing both installation and service.
Warning: Wiring connections must be made in accordance with all applicableelectrical codes. Use copper wire only. Failure to follow this instruction can resultin personal injury or death and/or property damage. 10-18 gauge wire recom-mended for 120 VAC connections with 9 in.lbs. max torque, 12-22 gauge wire forthermostat connections with 9 in.lbs. max torque, and 12-22 gauge wire for 24VAC source with 5 in.lbs. max torque.
WiringDiagram
Specifications:PRODUCT NUMBER TRANSFORMER MAX OUTPUT DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE AT 24 VAC WIDTH HEIGHT DEPTH
ZVC403 3 Zone 120 VAC Input 40 VA 10 1⁄4" 6 3⁄4" 2 3⁄4"ZVC405 5 Zone 120 VAC Input 80 VA 113⁄4" 71⁄2" 3"
All Zone Valve Controls are relay type DPDT and have a single phase motor rating per zone of 1⁄6 hp (5A) @ 120 VAC.
Instruction SheetZVC403 & ZVC405 Zone Valve Control
Features: External Indicator Lights
Simplified WiringWorks with 2, 3, or 4-
Wire Zone ValvesCompact DesignFuse Protected100% Factory TestedIsolated End Switch
Extra Set of Dry ContactsContractor Friendly PC
Board LayoutUniversal Thermostat
CompatibilityUL ApprovedSturdy Screw ConnectionsExtended 3 Year WarrantyMade in the USA
Do it Once. Do it Right.TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2000
TACO, Inc.
ENDSWITCH
N/O COM N/C
TT BOILER
HOT
NEUTRAL
120 VAC
Installation ofOptional System
57
24 VAC
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
MODENORMAL RESET
FUSE (7 A
MP M
AX
)
T T T T T T T T T T T T
ZONE 6 PRIORITY
OFF
ON
ZVC 406
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5
INDIRECTWATER HEATERAQUASTATOR THERMOSTAT
2 WIRE ZONE VALVE(NO END SWITCH)
JUMPER3 & 4
TACO3 WIRE ZONE VALVE
123
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
T STAT 1
VALVE 1
T STAT 2
VALVE 2T STAT 3VALVE 3T STAT 4
VALVE 4T STAT 5VALVE 5T STAT 6VALVE 6POWER
SIX ZONE ZONE VALVE CONTROLWITH OPTIONAL PRIORITY
24 VAC F
AC
TORY
INST
ALL
EDTR
AN
SFO
RMER
120 VACINPUT
WHITE
BLACK
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
N/O COMZONE 6 RELAY
TT
TO CIRCULATOROR BOILERAQUASTAT RELAY
DRYCONTACTS
ENDSWITCH
EXTRAEND
SWITCH
MAIN N/C
1 2 3 4ZONE 6
PRIORITYZONE
JUMPER3 & 4 SEE NOTE
Operation/External Diagnostics: When any thermostatcalls for heat, the appropriate zone valve is energized and theyellow light goes on. When the zone valve is fully open, thered light goes on and energizes the end switch relay. The greenlight should always be on, indicating that power is connected.
Priority Operation: When zone 6 is switched to the prioritysetting and is actuated, all other zones will stop operation untilzone 6 is satisfied. When zone 6 is not switched to priority, allzones will operate independently. Note: When a circulator isused on the priority zone instead of a zone valve, jumper 3 and4 of the priority zone.
Mode Operation: When the mode switch is set to NORMAL,the end switch relay will be energized if any zone is in opera-tion. When the switch is set to RESET, the end switch relaywill only be energized if priority zone is in operation.
The Taco Connection: Combine the reliability of the TacoZone Valves, Priority Zoning Circulators, Thermostats, and the“00” family of circulators with the advanced features of theTaco Zone Controls to achieve total system integration. Nomatter the application, Taco now provides the products tomaximize system performance while simplifying both instal-lation and service.
WiringDiagram
Specifications:PRODUCT NUMBER TRANSFORMER MAX OUTPUT DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE AT 24 VAC WIDTH HEIGHT DEPTH
ZVC404 4 with Priority 120 VAC Input 40 VA 101⁄4" 63⁄4" 23⁄4"ZVC406 6 with Priority 120 VAC Input 80 VA 113⁄4" 71⁄2" 3"
All Zone Valve Controls are relay type DPDT and have a single phase motor rating per zone of 1⁄6 hp (5A) @ 120 VAC.
Instruction SheetZVC404 & ZVC406 Zone Valve Control
Features: External Indicator LightsSwitchable PrioritySimplified WiringWorks with 2, 3, or 4-Wire Zone ValvesCompact DesignFuse Protected100% Factory TestedIsolated End SwitchExtra Set of Dry ContactsContractor Friendly PC Board LayoutUniversal Thermostat CompatibilityUL ApprovedSturdy Screw ConnectionsExtended 3 Year WarrantyMade in the USA
Warning: Wiring connections must be made in accordance with all applicable electrical codes. Use copperwire only. Failure to follow this instruction can result in personal injury or death and/or property damage.10-18 gauge wire recommended for 120 VAC connections with 9 in.lbs. max torque, 12-22 gauge wire forthermostat connections with 9 in.lbs. max torque, and 12-22 gauge wire for 24 VAC source with 5 in.lbs.
Do it Once. Do it Right.TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2000
TACO, Inc.
Installation ofOptional Systemand/or DHW Circulator
N/O COM N/C
TT BOILER
HOT
NEUTRAL120 VAC
ENDSWITCH
EXTRAEND
SWITCH
MAIN
(See Note)
SYSTEM CIRCULATOR
DHW CIRCULATOR
58
ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 ZONE 6
FUSE
7 A
MP
MA
X
T T T T T T T T T T T T
ZONE 6
OFF
ON
1 2 3 4ZONE 1
1 2 3 4ZONE 2
1 2 3 4ZONE 3
1 2 3 4ZONE 4
1 2 3 4ZONE 5
1 2 3 4ZONE 6
MODENORMALRESET
INDIRECTWATER HEATERAQUASTATOR THERMOSTAT
PRIORITYZONE
2 WIRE ZONE VALVE(NO END SWITCH)
TACO3 WIRE ZONE VALVE
123
JUMPER3 & 4
MOTOR ENDSWITCH
THERMOSTAT THERMOSTAT THERMOSTAT
4 WIRE ZONE VALVE(POWER OPEN, SELF CLOSING)
JUMPER3 & 4
1 2 3 4
MASTER
SLAVE
POWERCONTROLS
PLUG-INCARDS PRIORITY
TAC
O, I
NC
ZVC
406-
EXP
T STAT 1
T STAT 2
T STAT 3
T STAT 4
T STAT 5
T STAT 6
POWER ON
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 5
VALVE 6
SEE NOTE
EXPANSION
ZVC 406-EXPSIX ZONE ZONE VALVE CONTOL
WITH OPTIONAL PRIORITY
24 VAC 24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
POW
ER IN
24 VAC
FA
CTO
RYIN
STA
LLED
TRA
NSF
ORM
ER
120 VACINPUT
WHITE
BLACK
TO CIRCULATOROR BOILER
AQUASTAT RELAY
DRYCONTACTS
N/O COMZONE 6 RELAY
N/CEND
SWITCHA
BOILER
ENDSWITCH
BPUMP
TO CIRCULATOROR BOILER
AQUASTAT RELAY
Operation/External Diagnostics: When any thermostat calls forheat, the appropriate zone valve is energized and the yellow light goeson. When the zone valve is fully open, the red light goes on and ener-gizes the end switch relays. The green light should always be on, indi-cating that power is connected.Priority Operation: When zone 6 is switched to the priority settingand is actuated, all other zones will stop operation until zone 6 is sat-isfied. When zone 6 is not switched to priority, all zones will operateindependently. Note: When a circulator is used on the priority zoneinstead of a zone valve, jumper 3 and 4 of the priority zone.Mode Operation: When the mode switch is set to NORMAL, both endswitch relays will be energized if any zone is in operation. When themode switch is set to RESET, the end switch relay “A” will only be ener-gized when the priority zone is in operation. The end switch relay “B”will be energized when any zone is in operationPower Input: Connect 120 volt ac power input to leads on trans-former. Neutral to white wire. Hot to black wire.Expansion Connections: Set the expansion switch to MASTER on thezone valve control that has the designated priority zone or is utilizingthe PowerPort options. Set all other daisy chained controls to SLAVE.Connect thermostat wire (18-22 gauge) between terminals 1, 2, 3, 4 onthe master control to the corresponding 1, 2, 3, 4 on the SLAVE control(s).Controls may be daisy chained up to 20 zones using any combinationof Switching Relay -EXP or Zone Valve -EXP controls.
The Taco Connection: Combine the reliability of the Taco Zone Valves,Priority Zoning Circulators, Thermostats, and the “00” family of circula-tors with the advanced features of the Taco Zone Controls to achievetotal system integration. No matter the application, Taco now providesthe products to maximize system performance while simplifying bothinstallation and service.
WiringDiagram
Specifications:PRODUCT NUMBER TRANSFORMER MAX OUTPUT DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE AT 24 VAC WIDTH HEIGHT DEPTH
ZVC404-EXP 4 with Priority 120 VAC Input 80 VA 113⁄4" 71⁄2" 3"ZVC406-EXP 6 with Priority 120 VAC Input 80 VA 113⁄4" 71⁄2" 3"
All Zone Valve Controls are relay type DPDT and have a single phase motor rating per zoneof 1⁄6 hp (5A) @ 120 VAC.
Instruction SheetZVC404-EXP & ZVC406-EXP Zone Valve Control
Features:External Indicator LightsPlug-In PowerPort CardsSwitchable PrioritySimplified WiringAdd-On Power ControlsWorks with 2, 3, or 4-Wire
Zone ValvesUL ApprovedFuse Protected100% Factory Tested
Isolated End SwitchExpandable to 20 ZonesExtra Set of Dry ContactsContractor Friendly PC
Board LayoutUniversal Thermostat
CompatibilitySturdy Screw ConnectionsExtended 3 Year WarrantyMade in the USA
Warning: Wiring connections must be made in accordance with all applicable electrical codes. Use copper wire only. Failure to follow this instruction can result in personal injury or death and/or propertydamage. 10-18 gauge wire recommended for 120 VAC connections with 9 in.lbs. max torque, 12-22 gauge wire for thermostat connections with 9 in.lbs. max torque, and 12-22 gauge wire for 24 VAC source with5 in.lbs. max torque.
Do it Once. Do it Right.TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2000
TACO, Inc.
N/O COM N/C
T TBOILER
HOTNEUTRAL
120 VAC
(See Note)
SYSTEMCIRCULATOR
DHWCIRCULATOR
ENDSWITCH
ABOILER
ENDSWITCH
BPUMP
Installation ofOptional Systemand/or DHW Circulator
59
Operation HAFC101 and 201:The Hydro Air Fan Control is an interfacebetween the thermostat and air handler. Italso has an isolated end switch to start theboiler and/or pump. When the thermostatcalls for heat, the Fan Control energizes theend switch relay and allows the fan to operateat low speed when the water is above theoptional aquastat setting. When the thermo-stat calls for cooling, the Fan Control energizesthe condenser and operates on high speed.
Additional HAFC201 Operations:Selectable one, three or four minute delay onfan operation in heating mode. Selectablepump exercise activates circulator but doesnot enable boiler contacts. Two minutes every24 hours minimizes the chance of bacteriabuild-up in an open loop system. Thirty sec-onds every two weeks minimizes seasonalstart-up problems generally associated withharsh water conditions. Optional aquastat orthermostat can be connected to FreezeProtection TT terminals to reduce the chanceof pipes freezing by energizing the pump drycontacts (boiler contacts not activated.)
Switch Settings (HAFC201):1 1 minute on fan delay, in heating mode2 3 minute on fan delay, in heating mode
1&2 4 minute on fan delay, in heating mode3 Pump dry contact activated for 2 min-
utes every 24 hours (boiler contacts notactivated)
4 Pump dry contacts activated for 30 sec-onds every two weeks (boiler contacts not activated)
External Diagnostics:The external lights show full functionality ofthe Hydro Air Fan Control. The green lightshould always be on, indicating that power isconnected. Red lights indicate fan operationfor heating and cooling modes.
Warning:Wiring connections must be made in accordance withall applicable electrical codes. Use copper wire only.Failure to follow this instruction can result in personalinjury or death and/or property damage. 10-18 gaugewire recommended for 120 VAC connections with9 in.lbs. max torque, 12-22 gauge wire for thermostatconnections with 9 in.lbs. max torque, and 12-22 gaugewire for 24 VAC source with 5 in.lbs. max torque.
M
FanRelay
Line
24 V
AC
1 Speed Air Handler*
THERMOSTAT
Optional Power Wireto Thermostatthat Requires 24VAC
To: OptionalAquastat onReturn Line ofHydro Coil
Dry ContactsTo: “T T” onBoiler orSwitchingRelay
Power OnCall for HeatFan, CoolingFan, Heating
OutdoorCondenserUnit
T T
BOILER AIR HANDLER
G GX X C R Y
C R GYWTHERMOSTAT AQUASTATS
HAFC201HYDRO AIR FAN CONTROL
TTWATER COIL FREEZE PR
To: Optional Aquastator Thermostat to senselow ambienttemperature
Hot
Neutral
Circulator
XXPUMP
5 AMP 1/6 HP RATEDDRY CONTACTS
1 MIN
ON
DELA
Y - FAN
3 MIN
ON
DELA
Y - FAN
2 MIN
@ 24 H
R - PUM
P30 SEC
@ 2 W
K - PUM
P
OFF O
N
Jumper
(or to “T T” onswitching relay)
2 Speed Air Handler*
THERMOSTAT
Optional Power Wireto Thermostatthat Requires 24VAC
To: Aquastat onReturn Line ofHydro Coil
Dry ContactsTo: “T T” on Boileror Switching Relay
Power OnCall for HeatFan, CoolingFan, Heating
OutdoorCondenserUnit
T T
BOILER AIR HANDLER
G GX X C R Y
C R GY TWTHERMOSTAT AQUASTAT
HAFC101HYDRO AIR FAN CONTROL
M
Low
Hig
h
Line
24 V
AC
Fan
Rela
ys
Terminal Description:Thermostat:C Optional: Common side of transformer W White - Heating signal
to power some styles of thermostats Y Yellow - Condenser signalR Red - Hot side of transformer used to G Green - Fan signal
switch all functionsWater Coil Aquastat:TT Connect to aquastat at air handler to control operation of the fan when
in the heating mode. Install a jumper if the aquastat is not usedFreeze Protection Aquastat:TT Connect to aquastat or thermostat to sense low ambient temperature.
Reduces the chance of pipes freezing by energizing the pump dry contacts.Pump Dry Contacts:XX May switch pump directly by bringing in external line voltage or connect
to “T T” on a switching relay.Boiler Dry Contacts:XX Connect to the boiler or “T T” terminals on a switching relay.Air Handler:C Common side of transformer to power the Fan ControlR Red - Hot side of transformer used to switch all functionsY Yellow - Condenser signal
One Speed Motor:Glow Connect the fan to the relay. Keep the jumper installed between Ghigh and Glow.
Two Speed Motor:Ghigh Remove jumper and connect Ghigh to the high speed fan relay and
connect Glow to the low speed fan relay.
Specifications: ** Model number changed from SR501-FPRODUCT NUMBER POWER INPUT MAXIMUM RELAY THERMOSTAT SINGLE PHAZE MOTOR DIMENSIONS OF ENCLOSURENUMBER OF ZONES VOLTAGE COMBINED LOAD TYPE CURRENT RATING (RELAY) WIDTH HEIGHT DEPTH
HAFC101** 1 Zone 24 VAC Input 5 amps DPDT .18 1/6 HP(5A) @120VAC 4 1/4" 5 1/4" 2 3/4"HAFC201•• 1 Zone 24 VAC Input 5 amps DPDT .18 1/6 HP(5A) @120VAC 4 1/4" 5 1/4" 2 3/4"The Hydro Air Fan Controls are relay type DPDT, have a thermostat current of .18 and a single phase motor rating per zone of 1/6 HP (5A) @ 120 VAC.
Instruction SheetHydro Air Fan Controls
Printed in USA
Copyright 1999
TACO, Inc.
* Both HAFC101 and 201 capable of 1 and 2 speed applications
Do it Once. Do it Right.TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 1999
TACO, Inc.
60
Do it Once. Do it Right.TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Printed in USA
Copyright 2000
TACO, Inc.
Instruction SheetPC600 Post Purge Timer Plug-In PowerPort Card
102-094
SUPERSEDES: August 1, 1997 EFFECTIVE: May 1, 2000
Plant ID No. 9300-867
Operation:Once the priority zone is satisfied, the PC600 maintains power to the circulator, but does not fire the boiler. The circulator purges excess heat into the priority zone,minimizing standby loss during warm weather months and optimizing boiler operation when used with a boiler reset control. Power can be maintained to the circu-lator from a minimum of 10 seconds to a maximum of 420 seconds. The power LED light is energized when the priority zone or the post purge card is in operation.Installation:The PC600 can be installed in any one of the PowerPort terminals located on the Taco Expandable (-EXP) Control(s). Remove the shunt/jumper between pins 9& 10 on the PowerPort terminal before installing the PC600. Align the connector on the base of the post purge card with the PowerPort terminal on the ExpandableControl and push until the two mate.XX Terminals (Optional):The XX terminals on the post purge card can be wired to TT on the boiler to fire only when the priority zone is calling for heat. If using a boiler with an internalreset control, wire the XX terminals in parallel with the TT connections of the internal reset control.
Instruction SheetPC605 Priority Protection Plug-In PowerPort Card
102-095
SUPERSEDES: MAY 1, 1998 EFFECTIVE: MAY 1, 2000
PLANT ID NO. 9300-1012
Operation:The PC605 Priority Protection Plug-In Card is a solid state control that helps prevent freeze-ups in the event of a priority zone failure. If the priority zone calls for heatcontinuously for more than one hour, power is returned to the space heating (non-priority) zones, allowing all zones to function independently. Once the priority zone issatisfied, the PC605’s auto-reset is activated and the priority zone is again allowed to have priority for up to one hour the next time it calls. The one hour time frame isnot adjustable. The red LED light is energized only when the Priority Protection Card is operating in priority override mode.
Installation:The PC605 can be installed in any unoccupied PowerPort terminal located on the Taco Expandable (-EXP) Control(s). Do not remove the shunt between pins 9 &10 on the Expandable Control unless a PC600 is also installed. Align the connector on the base of the priority protection card with the PowerPort terminal on theExpandable Control and push until the two mate. The PC605 can be used in conjunction with any other Taco PC style PowerPort Cards or Add-on Controls.
Do it Once. Do it Right.TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Printed in USA
Copyright 2000
TACO, Inc.
Operation:The PC610 Pump Exercise and Timer Plug-In Card is a solid state universal timer designed to cycle all the pumps that are attached to the Expandable Control(s)at selected time intervals. This minimizes seasonal start-up problems generally associated with harsh water conditions. The control can be configured to reducethe chance of freeze-ups by cycling the pumps more often during cold weather months. Bacteria can be minimized in heating systems that utilize domestic hotwater heaters as their heat source by systematically circulating the water.
Installation:The PC610 can be installed in any unoccupied PowerPort terminal located on the Taco Expandable (-EXP) Control(s). Do not remove the shunt between pins 9 & 10 onthe Expandable Switching Relay unless a PC600 is also installed. Align the connector on the base of the priority protection card with the PowerPort terminal on theExpandable Switching Relay and push until the two mate. The PC610 can be used in conjunction with any other Taco PC style PowerPort Cards or Add-on Controls.
Typical Settings:
Instruction SheetPC610 Pump Exercise and Timer Plug-In PowerPort Card
102-096
SUPERSEDES: May 31, 1998 EFFECTIVE: May 1, 2000
Plant ID No. 9300-1025
Application On Time Off TimePump Exercise 30 sec. 2 weeks
Bacteria Minimization 4 min. 12 hoursFreeze Protection 4 min. 1 hour
Do it Once. Do it Right.TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Printed in USA
Copyright 2000
TACO, Inc.
61
Taco Low Water Cutoff Replacement Guide
Taco McDonnell & Miller Hydrolevel Honeywell
LTA1203N-1
900900CPS-800-120PS-801-120PS-850-120PS-851-120
450650
RW700A1031RW700A1056RW700A1080
LTM1203N-1
900M901M902MPS-801-M-120PS-850-M-120PS-851-M-120
550750
RW700B1054RW700B1039RW700B1021
LTA0243N-1
PS-800-24PS-802-24PS-850-24PS-852-24
400600
RW700A1098
LTM0243N-1PS-850-M-24PS-802-M-24PS-852-M-24
500700
LTA1203R-1750-120750-T-120
650R
LTM1203R-1750-M-120750-MT-120
550R
LTA1202R-1 PS-851-RX2-120 650RLTM1202R-1 PS-851-M-RX2-120 550RLTA0242R-1 PS-802-RX2-24 400RLNA0243S-1 RB-24 24SV
LNA1203S-1
901RB-120RB-120IIRB-122
170SVRW700A1007RW700A1106
P3R-1 RS-1-LPLTA1203S-1 PS-851-SP-120 650SVLTM1203S-1 PS-851-SP-M-120 550SVLTA0243S-1 PS-852-SP-24 600SVLTM0243S-1 PS-852-SP-M-24 500SV
Bold / Italics Indicates Discontinued Part Number
62
Taco LT Series 120 Volt LWCO Competitive Wiring Cross Reference
120 VAC Models with 120 VAC Burner Circuits
LTx120x
NC COM NO H N GND P
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
PS-801/851-120w/Red & Amber LEDs
Series 750
1 2 3 4 5
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
450, 550, 650 & 750
2 1 P1 P2 A
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
N H C W B
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
PS-801/851-120w/Red & Green LEDs
120 VAC Models with 24 VAC Burner Circuits
LTx120x
NC COM NO H N GND P
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
PS-801/851-120w/Red & Amber LEDs
Series 750
1 2 3 4 5
450, 550, 650 & 750
2 1 P1 P2 A
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
N H C W B
PS-801/851-120w/Red & Green LEDs
24 VACTRANSFORMER
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
63
Taco LT Series 24 Volt LWCO Competitive Wiring Cross Reference
24 VAC Models with 24 VAC Burner Circuits
LTx024x
NC COM NO H N GND P
BURNERCIRCUIT
HOT
NEUTRAL
24 VACCIRCUIT
400, 500, 600 & 700
2 1 P1 P2 A
BURNERCIRCUIT
HOT
NEUTRAL
24 VACCIRCUIT
N H C W B
BURNERCIRCUIT
HOT
NEUTRAL
24 VACCIRCUIT
PS-802/852-24
24 VAC Models with 120 VAC Burner Circuits
LTx024x
NC COM NO H N GND P
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
400, 500, 600 & 700
2 1 P1 P2 A
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
N H C W B
PS-802/852-24
24 VACTRANSFORMER
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
64
Taco LN Series 120 Volt LWCO Competitive Wiring Cross Reference
120 VAC Models with 120 VAC Burner Circuits
LNA120S
N H COM NC NO
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
RB-120
1 2 3 4 5
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
RB-122
N H B C
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
GN H P1 P2 A
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
170
120 VAC Models with 24 VAC Burner Circuits
LNA120S
N H COM NC NO
RB-120
1 2 3 4 5
RB-122
N H B C GN H P1 P2 A
170
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
65
Taco LN Series 24 Volt LWCO Competitive Wiring Cross Reference
24 VAC Models with 24 VAC Burner Circuits
LNA024S
N H COM NC NO
BURNERCIRCUIT
HOT
NEUTRAL
24 VACCIRCUIT
RB-24
BURNERCIRCUIT
HOT
NEUTRAL
24 VACCIRCUIT
24
BURNERCIRCUIT
HOT
NEUTRAL
24 VACCIRCUIT
YellowWire
YellowWire
WhiteWire
RedWire
OrangeWire
BrownWire
WhiteWire
BlackWire
24 VAC Models with 120 VAC Burner Circuits
LNA024S
N H COM NC NO
BURNERCIRCUIT
HOT
NEUTRAL
120 VACCIRCUIT
24 VACTRANSFORMER
66
Wiring TACO LN or LT Series 24VAC Low Water Cutoff toMcDonnell & Miller Series WF2 Uni-Match Electric Water Feeder
UNI-MATCHWATER FEEDER
MODEL WF2-U-24
24VACSUPPLY
50/60 HzH
N
N H COM NC NOAC POWER OUTPUT CONTACTS
N HW
1 2 3
BURNER
SWITCH POSITION #2
M&M23
Set the TACO LT Model’s DOM to30 seconds and DOB to 15 seconds.*
0R
Remove jumper between H and COM if using power sourceother than burner circuit or when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
* Note on switch position:
Switch setting 1 (M&M), the feed cycle repeats indefinitely. Position 2 and 3 gives one feed cycle.
If using the LN series, choose whichever position best matches the application:
WF-2 switch to position 1- 60 sec. delay, 90 sec. feed, repeats
WF-2 switch to position 2- 90 sec. delay, 90 sec. feed
WF-2 switch to position 3- 100 sec. delay, 90 sec. feed
Wiring TACO LN or LT Series 120VAC Low Water Cutoff toMcDonnell & Miller Series WF2 Uni-Match Electric Water Feeder
UNI-MATCHWATER FEEDER
MODEL WF2-U-120
120VACSUPPLY
50/60 Hz H
N
N H COM NC NOAC POWER OUTPUT CONTACTS
N HW
1 2 3
BURNER
SWITCH POSITION #2
M&M23
Set the TACO LT Model’s DOM to30 seconds and DOB to 15 seconds.*
0R
* Note on switch position:
Switch setting 1 (M&M), the feed cycle repeats indefinitely. Position 2 and 3 gives one feed cycle.
If using the LN series, choose whichever position best matches the application:
WF-2 switch to position 1- 60 sec. delay, 90 sec. feed, repeats
WF-2 switch to position 2- 90 sec. delay, 90 sec. feed
WF-2 switch to position 3- 100 sec. delay, 90 sec. feed
24 VAC LWCO Using Burner Circuit Power Source
Remove jumper between H and COM if using power sourceother than burner circuit or when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
120 VAC LWCO Using Burner Circuit Power Source
67
Wiring TACO LN or LT Series 24VAC Low Water Cutoff toHydrolevel VXT-24 Water Feeder (Non-Display Model)
SAFGARD VXT-24WATER FEEDER
24VACSUPPLY
50/60 Hz H
N
N H COM NC NOAC POWER OUTPUT CONTACTS
BURNER
Set the TACO LT Model’s DOB to30 seconds and DOM to 15 seconds.
Set Safgard as desired.
WHITE BLACK
Remove jumper between H and COM if using power sourceother than burner circuit or when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
Wiring TACO LN or LT Series 120VAC Low Water Cutoff toHydrolevel VXT-120 Water Feeder (Non-Display Model)
SAFGARD VXT-120WATER FEEDER
120VACSUPPLY
50/60 Hz H
N
N H COM NC NOAC POWER OUTPUT CONTACTS
BURNER
Set the TACO LT Model’s DOB to30 seconds and DOM to 15 seconds.
Set Safgard as desired.
WHITE BLACK
24 VAC LWCO Using Burner Circuit Power Source
Remove jumper between H and COM if using power sourceother than burner circuit or when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
120 VAC LWCO Using Burner Circuit Power Source
68
Wiring TACO LN or LT Series 24VAC Low Water Cutoff toHydrolevel VXT-24 Programmable Water Feeder (Model with Display)
SAFGARD VRTX-24WATER FEEDER
24VACSUPPLY
50/60 Hz H
N
N H COM NC NOAC POWER OUTPUT CONTACTS
BURNER
Set the TACO LT Model’s DOB to30 seconds and DOM to 15 seconds.
Set Safgard as desired.
WHITE REDBLACK
Remove jumper between H and COM if using power sourceother than burner circuit or when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
Wiring TACO LN or LT Series 120VAC Low Water Cutoff toHydrolevel VXT-120 Programmable Water Feeder (Model with Display)
SAFGARD VRTX-120WATER FEEDER
120VACSUPPLY
50/60 Hz H
N
N H COM NC NOAC POWER OUTPUT CONTACTS
BURNER
Set the TACO LT Model’s DOB to30 seconds and DOM to 15 seconds.
Set Safgard as desired.
WHITE REDBLACK
24 VAC LWCO Using Burner Circuit Power Source
Remove jumper between H and COM if using power sourceother than burner circuit or when using mixed voltages.
Do not connect feeder to a manual reset LWCO.
120 VAC LWCO Using Burner Circuit Power Source
69
Taco Industrial Flow Switch Replacement Guide
Taco PotterMcDonnell
& Miller
JohnsonControls /
PennHydrolevel
IFS01BF-1 IFS-1 FS4-3F61KB-11F61LB-1
44-100
IFS01BR-1 FS4-3-RP
IFS01SF-1 IFSS-1FS4-3SFS4-3S-E
IFS02BF-1 IFS-2FS4-3DFS4-3D-E
IFS02SF-1 IFSS-2 FS4-3DSIFSH1BF-1 IFS-HC-1IFSH1SF-1 IFSS-HC-1IFSH2BF-1 IFS-HC-2IFSH2SF-1 IFSS-HC-2IFSW2BF-1 IFS-WP-2IFSW2SF-1 IFSS-WP-2
IFSWSBF-1IFS-WPSIFS-WP-1
FS8-WF61MB-1F61MB-5
IFSWSSF-1IFSS-WPSIFSS-WP-1
IFSWTBF-1 IFS-WPTIFSWTBR-1 FS4-3RP-T
70
Aquastat Wiring
L1 L2 T T
L1(HOT)
L2(NEUTRAL)
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
B2 C2 B1ZR
TACOZONE
CONTROL
HONEYWELL L8124A & C OR EQUAL
120 VACINPUT
C1 ZC
END SWITCH
B1 B2 T T
L1(HOT)
L2(NEUTRAL)
CIRCULATORON BOILER
(IF ATTACHED)L1 C2L2
TACOZONE
CONTROL
HONEYWELL L8124B OR EQUAL120 VACINPUT
C
MILLI-VOLTAGEGAS VALVE
END SWITCH
T1 T2 Z
L1(HOT)
L2(NEUTRAL)
CIRCULATORON BOILER
(IF ATTACHED)
L1
C2
L2
TACOZONE
CONTROL
HONEYWELL L8124E OR EQUAL
120 VACINPUT
C1
LOW VOLTAGEGAS VALVE
END SWITCH
B1 B2
Aquastat Wiring
TV T Z
L1(HOT)
CIRCULATORON BOILER
(IF ATTACHED)
B2C2
B1
C1
TACOZONE
CONTROL
HONEYWELL L8124G & L OR EQUAL120 VACINPUT
ZR
END SWITCH
L1
L2(NEUTRAL)
L2
ZC
LINEVOLTAGE
OIL BURNERRELAY OR
GAS VALVE
71
L1 L2 T T
L1(HOT)
L2(NEUTRAL)
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
B2
C1
B1ZR
TACOZONE
CONTROL
HONEYWELL L8124M OR EQUAL
120 VACINPUT
C2
ZC
END SWITCH
L1 L2 T T
L1(HOT)
L2(NEUTRAL)
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
C1 B2B1
TACOZONE
CONTROL
HONEYWELL L8148A OR EQUAL
120 VACINPUT
C2
END SWITCH
3
Aquastat Wiring
TV W T
L1(HOT)
L2(NEUTRAL)
CIRCULATORON BOILER
(IF ATTACHED)
L1
C2
L2
TACOZONE
CONTROL
HONEYWELL L8148E OR EQUAL
120 VACINPUT
C1
LOW VOLTAGEGAS VALVE
END SWITCH
B1 B2
Z
72
TV W T
L1(HOT)
L2(NEUTRAL)
CIRCULATORON BOILER
(IF ATTACHED)
L1
C2
L2
TACOZONE
CONTROL
HONEYWELL L8148J OR EQUAL
120 VACINPUT
C1
LOW VOLTAGEGAS VALVE
END SWITCH
B1 B3
ZTP
B2
MILLI-VOLTAGE
GASVALVE
OR
L1 L2B2C2
B1
L1(HOT)
L2(NEUTRAL)
OIL BURNERAND
IGNITION
CIRCULATORON BOILER
(IF ATTACHED)
T T FF
TACOZONE
CONTROL
HONEYWELL L8182D OR EQUAL
120 VACINPUT
ZC
ZR
END SWITCH
C1
CAD CELL
Aquastat Wiring
L1 L2 T T
L1(HOT)
L2(NEUTRAL)
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
B2 C2 B1ZR
TACOSWITCHING
RELAY
HONEYWELL L8124A & C OR EQUAL
120 VACINPUT
C1 ZC
ZC ZR N HTTHERMOSTAT
(IF INDEPENDENT ZONE)
73
TV T Z
L1(HOT)
CIRCULATORON BOILER
(IF ATTACHED)
B2C2
B1
C1
HONEYWELL L8124G & L OR EQUAL
120 VACINPUT
ZR
L1
L2(NEUTRAL)
L2
ZC
LINEVOLTAGE
OIL BURNERRELAY OR
GAS VALVE
TACOSWITCHING
RELAY
ZC ZR N H
T THERMOSTAT(IF INDEPENDENT ZONE)
L1 L2 T T
L1(HOT)
L2(NEUTRAL)
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
B2 C2 B1ZR
TACOSWITCHING
RELAY
HONEYWELL L8124M OR EQUAL
120 VACINPUT
C1 ZC
ZC ZR N HTTHERMOSTAT
(IF INDEPENDENT ZONE)
Aquastat Wiring
LINE VOLTAGEOIL BURNER RELAY
OR GAS VALVE
CIRCULATORON BOILER
(IF ATTACHED)
C1
B2
B1
HONEYWELL L8148A OR EQUAL
C2
3
L1 L2 T T
L1(HOT)
L2(NEUTRAL)
TACOSWITCHING
RELAY
120 VACINPUT
ZC ZR N HT
THERMOSTAT(IF INDEPENDENT ZONE)
R
W
BB
RL6006LOWLIMIT
CONTROLERB2
74
L1 L2B2C2
B1
L1(HOT)
L2(NEUTRAL)
OIL BURNERAND
IGNITION
CIRCULATORON BOILER
(IF ATTACHED)
T T FF
HONEYWELL L8182D OR EQUAL
120 VACINPUT
ZC
ZR
C1
CAD CELL
TACOSWITCHING
RELAY
ZC ZR N H
TTHERMOSTAT
(IF INDEPENDENTZONE)
75
Standard Terms and Definitions
Switching Relay: Transformer and relay in one box, which allows a low voltage thermostat to control a line voltage load (circulator),with an isolated end switch that can energize the boiler.
Zone Valve Control: Transformer and relay in one box, which allows a low voltage thermostat to control a low voltage zone valve, withan isolated end switch that can energize the boiler and/or circulators.
Dry Contacts: Set of relay contacts that make and beak, where no voltage is present. Usually can switch 24 or 120 VAC.
Isolated End Set Switch: Set of dry contacts that make when a zone calls for heat. Usually connected to a boiler’s aquastat TT.
Mode Switch: Switch set to NORMAL – When any zone calls for heat, the end switch will make and fire the boiler.Switch set to RESET – When any zone calls for heat, a heat demand signal is given to external add-on reset control and it controlsboiler operation.Also when the priority zone calls for heat and is switched to priority, the end switch will override reset control andfire boiler to high limit.
TT: Where thermostat or aquastat connects on a heating control.
XX: Denotes Isolated End Switch.
Low Voltage: 24 VAC for most HVAC systems.
Line Voltage: Normally 120 VAC relative to ground.
H or L1: Hot side of line voltage.
N or L2: Neutral side of line voltage.
ZR: 120 VAC (Hot) signal from switching relay to boiler’s operating aquastat to fire the burner to high limit when any zone calls forheat. Also ideal for controlling primary circulator.
ZC: 120 VAC (Hot) signal from boiler’s operating aquastat to switching relay allowing circulator(s) to run when aquastat is above theset low limit.
Cold Start: A boiler that fires only when there is a call for heat.
Tankless Coil: A method of heating domestic water utilizing a heat exchanger inside a boiler.The boiler also maintains heat year roundto deliver hot water on demand.
DHW Heater: A method of heating domestic water utilizing a heat exchanger and storage tank.
Transformer: A component for increasing or reducing AC voltage. Rated in VA (volts x amps).
OHMS Law: Example: A 24 volt, 40 VA transformer can produce how much current?
Current = VA / Voltage 40 / 24 = 1.6 Amps
I = E/R where I = Current in AmpsR = E/I R = Resistance in OhmsE = I x R E = Volts
W = E x I W = Watts or VAI = W(VA)/E
RELAY CONTACTS:
N/C: Normally closed connection of a relay, when not energized.N/O: Normally open connection of a relay, when not energized.Com: The common terminal for normally open and normally closed.Pole: The number of independent circuits of a switch or relay.
Throw: The number of settings which a switch or relay can have.
DPDT = Double Pole Double Throw
N/O N/C N/C N/O3 4 4 6 6 5
COM COM
76 TACO Zone Controls Cross-Reference
TACO ARGO ERIE HONEYWELL WHITE-ROGERS
SWITCHING RELAYS
1 Zone Switching Relay (DPDT) SR501 AR821 (1), AR822 SR100 RA89A (2), RA845A (1), RA832A (1) 889-189 (2), 829-845 (1)1 Zone Switching Relay Replacement PC Board (DTSP) SR501-845RP2 Zone Switching Relay with Priority SR502 AR-861-2 (3) SR2013 Zone Switching Relay with Priority SR503 AR-861-3 (3) SR301 R8888A10074 Zone Switching Relay with Priority SR504 AR-842 SR601 R8888B10056 Zone Switching Relay with Priority SR506 AR-866 SR601 (4)
SWITCHING RELAYSWITH POWERPORT OPTIONS
3 Zone Switching Relay with Priority and 3 Power Ports SR503-EXP ARM-861-DP (5,6),ARM-3P4 Zone Switching Relay with Priority and 3 Power Ports SR504-EXP ARM-842-DP (5,6),ARM-4P6 Zone Switching Relay with Priority and 3 Power Ports SR506-EXP ARM-866-DP (5,6),ARM-6P
ZONE VALVE CONTROLS
3 Zone Valve Control ZVC403 (7) AZ-3 R8889A10144 Zone Valve Control with Priority ZVC404 (7) AZ-4P R8889B10125 Zone Valve Control ZVC405 (7) AZ-5 VL500 (8)6 Zone Valve Control with Priority ZVC406 (7) AZ-6P VL500 (8)
ZONE VALVE CONTROLSWITH POWERPORT OPTIONS
4 Zone Valve Control with Priority and 2 Power Ports ZVC404-EXP6 Zone Valve Control with Priority and 2 Power Ports ZVC406-EXP
PLUG IN POWERPORT CARDS
Post Purge Timer Plug-In Card PC600Priority Protection Plug-In Card PC605 DPM-1Universal Timer/Pump Exercize Plug-In Card PC610
77
TACO Zone Controls Cross-Reference (Continued)
TACO ARGO ERIE HONEYWELL WHITE-ROGERS
ADD-ON POWER CONTROLS
Boiler Reset Control PC700 DPM-2 BB12002-Stage Boiler Reset Control PC702Variable Speed Pump Injection Mixing Control PC705 BB3000
FAN CONTROLS
1 Zone Hydro Air Fan Control (1 or 2 Speed) HAFC101 ARH-1,ARH-2,ARH-3 WA3001 Zone Hydro Air Fan Control with Time Delays (1 or 2 Speed) HAFC201
REPLACEMENT PARTS
24 Volt Replacement Relay SR024-001RP R-35 EXP10120 Volt Replacement Relay SR120-001RP R-49
NOTES:
1. Does not have both normally open and normally closed contacts.2. Has only one set of normally open contacts (SPST).3. Does not have optional priority.4. Can be expanded to five and six zones with the addition of EXP10 relays.5. Argo ARM units are expandable to 10 zones using special controls (ARM-1,ARM-4) with a phone jack.
TACO switching relays can be expanded up to 20 zones using any combination of -EXP models with no special connections.6. Includes only one data port for adding data port modules.7. All TACO zone valve controls include an extra set of dry contacts (N/O, Common, N/C).8. VL500 is only 5 zones, 4 normal and 1 priority.
Do it Once. Do it Right.TACO, INC., 1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.TACO (Canada), Ltd., 6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Visit our web site at: http://www.taco-hvac.com
Printed in USA
Copyright 2003
TACO, Inc.
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