69-1331 - t8635l microelectronic communicating ...library.ademconet.com/mwt/fs2/7/5619.pdft8635l...

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® U.S. Registered Trademark Copyright © 2003 Honeywell • All Rights Reserved INSTALLATION INSTRUCTIONS 69-1331-5 T8635L Microelectronic Communicating Programmable Thermostat APPLICATION The T8635L is a microelectronic communicating programmable thermostat that supports single-stage or multi-stage conventional and heat pump applications when used with the W8835 (3H/2C) or W8635A (up to 2H/2C conven- tional) or W8635B (up to 2H/1C heat pump) Equipment Interface Module (EIM). See Table 1. Table 1. T8635L Thermostat Description. a See System and Fan Keys section for specific information. Accessories Required (Not Included) W8835A,E EnviraZone Panel – For up to 3H/2C con- ventional or heat pump applications. W8635A – Equipment Interface Module (EIM) for up to 2H/2C conventional applications. W8635B – Equipment Interface Module (EIM) for up to 2H/1C heat pump applications. Optional W8703A – Damper Interface Module. C7089B – Outdoor Temperature Sensor. C7835A – Discharge Air Temperature Sensor. MERCURY NOTICE If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Dispose of properly. Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old control. INSTALLATION When Installing this Product… 1. Read these instructions carefully. Failure to follow these instructions can damage the product or cause a hazardous condition. 2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. 3. Installer must be a trained, experienced service technician. 4. After completing installation, use these instruc- tions to check out the product operation. CAUTION Voltage Hazard. Can cause electrical shock or equipment damage. Disconnect power before beginning installation. Location Install the thermostat about 5 ft. (1.5m) above the floor in an area with good circulation at average temperature. See Fig 1. Model System Changeover a System Selection a Fan Selection T8635L and W8835A,E Heat-Cool or Heat Pump Automatic or Manual Heat-Off-Cool-Auto Em. Ht On-Auto T8635L and W8635A Heat-Cool Automatic or Manual Heat-Off-Cool-Auto On-Auto T8635L and W8635B Heat Pump Heat-Off-Cool-Auto Em. Ht

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Page 1: 69-1331 - T8635L Microelectronic Communicating ...library.ademconet.com/MWT/fs2/7/5619.pdfT8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT 69-1331—5 6 SETTINGS Thermostat

® U.S. Registered TrademarkCopyright © 2003 Honeywell • • All Rights Reserved

INSTALLATION INSTRUCTIONS

69-1331-5

T8635L Microelectronic Communicating Programmable

Thermostat

APPLICATIONThe T8635L is a microelectronic communicating programmable thermostat that supports single-stage or multi-stage conventional and heat pump applications when used with the W8835 (3H/2C) or W8635A (up to 2H/2C conven-tional) or W8635B (up to 2H/1C heat pump) Equipment Interface Module (EIM). See Table 1.

Table 1. T8635L Thermostat Description.

aSee System and Fan Keys section for specific information.

Accessories

Required (Not Included)W8835A,E EnviraZone Panel – For up to 3H/2C con-

ventional or heat pump applications.W8635A – Equipment Interface Module (EIM) for up to

2H/2C conventional applications.W8635B – Equipment Interface Module (EIM) for up to

2H/1C heat pump applications.

OptionalW8703A – Damper Interface Module.C7089B – Outdoor Temperature Sensor.C7835A – Discharge Air Temperature Sensor.

MERCURY NOTICEIf this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Dispose of properly.

Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old control.

INSTALLATION

When Installing this Product…1. Read these instructions carefully. Failure to follow

these instructions can damage the product or cause a hazardous condition.

2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.

3. Installer must be a trained, experienced service technician.

4. After completing installation, use these instruc-tions to check out the product operation.

CAUTIONVoltage Hazard.Can cause electrical shock or equipment damage.Disconnect power before beginning installation.

LocationInstall the thermostat about 5 ft. (1.5m) above the floor in an area with good circulation at average temperature. See Fig 1.

Model System Changeovera System Selectiona Fan SelectionT8635L and W8835A,E Heat-Cool or

Heat PumpAutomatic orManual

Heat-Off-Cool-AutoEm. Ht

On-Auto

T8635L and W8635A Heat-Cool Automatic or Manual

Heat-Off-Cool-Auto On-AutoT8635L and W8635B Heat Pump Heat-Off-Cool-Auto

Em. Ht

Page 2: 69-1331 - T8635L Microelectronic Communicating ...library.ademconet.com/MWT/fs2/7/5619.pdfT8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT 69-1331—5 6 SETTINGS Thermostat

T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

69-1331—5 2

Fig. 1. Selecting thermostat location.

Do not install the thermostat where it can be affected by:— drafts or dead spots behind doors and in corners.— hot or cold air from ducts.— radiant heat from sun or appliances.— concealed pipes and chimneys.— unheated (uncooled) areas such as an outside wall

behind the thermostat.

Wallplate InstallationThe thermostat can be mounted horizontally on the wall or on a 2 in. by 4 in. wiring box. Position wallplate hori-zontally on the wall or on a 2 in. by 4 in. wiring box.

1. Position and level the wallplate (for appearance only). The thermostat functions properly even when not level.

2. Use a pencil to mark the mounting holes. See Fig. 2.

3. Remove the wallplate from the wall and drill two 3/16-in. holes in the wall (if drywall) as marked. For firmer material such as plaster, drill two 7/32-in. holes. Gently tap anchors (provided) into the drilled holes until flush with the wall.

4. Position the wallplate over the holes, pulling the wires through the wiring opening.

5. Loosely insert the mounting screws in the holes.6. Tighten the mounting screws. Fig. 2. Mounting the wallplate.

WIRINGAll wiring must comply with local electrical codes and ordinances. See Fig. 5 through 8 wiring diagrams for specific equipment applications. Refer to Table 2 for ter-minal designations.

5 FEET[1.5 METERS]

YES

NO

NO

NO

M10106

WIRES THROUGH WALL

WALL

MOUNTING HOLES

MOUNTING SCREWS

M6530A

WALLANCHORS(2)

Page 3: 69-1331 - T8635L Microelectronic Communicating ...library.ademconet.com/MWT/fs2/7/5619.pdfT8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT 69-1331—5 6 SETTINGS Thermostat

T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

3 69-1331—5

CAUTIONVoltage Hazard.Can cause electrical shock or equipment damage.Disconnect power before beginning installation.

1. Loosen the terminal screws on the wallplate and connect the system wires. See Fig. 3 and 4.

IMPORTANTUse 18-gauge color-coded thermostat cable for proper wiring. Shielded cable is not required.

2. Securely tighten each terminal screw.3. Push excess wire back in the hole.4. Plug the hole in the wall with non-flammable insu-

lation to help prevent drafts from adversely affect-ing thermostat operation.

Fig. 3. Correct wiring technique.

Fig. 4. Using wire nut to pigtail a connection when three or more wires

are terminated at one terminal.

Table 2. Terminal Designations.

Fig. 5. T8635L/W8635A with Outdoor Temperature Sensor.

Fig. 6. T8635L/W8635B with Outdoor Temperature Sensor.

M4826

FOR WRAPAROUND INSERTION STRIP 7/16 IN. (11 MM).

FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM).

WIRE NUT

M13378

T8635L Terminal Designations Function1 Data – Connect to terminal 1 on W8835 or W8635.2 Power – Connect to terminal 2 on W8835 or W8635.3 Power – Connect to terminal 3 on W8835 or W8635.

OT Outdoor Temperature Sensora

a Use optional C7089B Outdoor Temperature Sensor.

OT Outdoor Temperature Sensora

L1 (HOT)

L2

COOL 1RELAY

HEAT 2RELAY

FAN RELAY

OTOT 21 3

FACTORY INSTALLER JUMPERS. M13429

C7089B OUTDOORTEMPERATURE SENSOR

1

T8635L

HEAT 1RELAY

W8635A

C

R

RHRC

1

2

3

Y2

W2

Y1

G

W1

COOL 2RELAY

1

SYSTEMTRANSFORMER

EM. HT.RELAY

AUX. HT.RELAY

FAN RELAY

OTOT 21 3

FACTORY INSTALLER JUMPER. M13431

C7089B OUTDOORTEMPERATURE SENSOR

1

T8635L

COMP.RELAY

W8635B

C

R

RH

1

2

3

O

B

AUX

E

G

W1/Y1

COOLCHANGE-OVER

L

HEATCHANGE-OVER

COMPRESSORMONITOR

L1 (HOT)

L2

1

SYSTEMTRANSFORMER

Page 4: 69-1331 - T8635L Microelectronic Communicating ...library.ademconet.com/MWT/fs2/7/5619.pdfT8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT 69-1331—5 6 SETTINGS Thermostat

T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

69-1331—5 4

Fig. 7. T8635L/W8703A/W8635A with Outdoor Temperature Sensor.

IMPORTANT Connect outdoor sensor to only one thermo-stat and configure that thermostat Installer Setup No. 45 to 1. See Table 6. Connecting more than one outdoor sensor or configuring more than one thermostat for outdoor sensor causes the thermostat to incorrectly display the outdoor temperature.

L1 (HOT)

L2

SYSTEMTRANSFORMER

COOL 1RELAY

HEAT 2RELAY

FAN RELAY

OTOT 21 3

FACTORY INSTALLER

JUMPERS.

M13430B

C7089B OUTDOORTEMPERATURE SENSOR

T8635L

HEAT 1RELAY

W8635A

C

R

RHRC

1

2

3

Y2

W2

Y1

G

W1

COOL 2RELAY

W8703A

L1 (HOT)

L2

EXTERNAL40 VATRANSFORMER

OTOT 21 3

T8635L

OTOT 21 3

T8635L

ZO

NE

AZ

ON

E B

ZO

NE

C

CLOSEOPEN

OPEN

CLOSE

OPEN

CLOSE

COM

TR1

TR2

2

3

1

54 6 Z

21 3 X

MODEL AOBDZONE DAMPER

Power-closed/Spring-open(Model ZD)

Power-closed/Spring-open(Model ARD)

Page 5: 69-1331 - T8635L Microelectronic Communicating ...library.ademconet.com/MWT/fs2/7/5619.pdfT8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT 69-1331—5 6 SETTINGS Thermostat

T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

5 69-1331—5

Fig. 8. W8835 EnviraZone Panel wiring.

Mounting Thermostat on WallplateNOTE: To remove the thermostat from the wall, first

pull out at the bottom of the thermostat; remove the top last.

1. Engage tabs at the top of the thermostat and wall-plate. See Fig. 9.

2. Press the lower edge of the case to close and latch.

Fig. 9. Mounting thermostat on wallplate.

ZONE DAMPER MOTORSM1 - commonM4 - power openM6 - power closed

PURGEOVERRIDEBOOTDISCOVERY

T2

T1

C

R

This diagram shows the typicalequipment, thermostat, anddamper motor connections. For specific wiring,refer to the InstallationInstructions.

C R

24 VAC, 40 VA Optional

Transformer(required ifsystem load

is greaterthan singletransformer

output.)

C R

24 VAC, 40 VA Panel

Transformer

DamperXFRM

EnviracomXFRM

32003618-009REV. B

HEAT COOL PURGE FAN EM. HT. COMM ZONE 1 ZONE 2 ZONE 3

HVAC EquipmentL

C

Rh

Rc

W1/E

HP Fault

HP Fault Common

Heating Transformer24 VACEquipment Cooling Transformer

First Stage Heating/Emergency Heat Relay

W2Second Stage Heating Relay

W3/AUXThird Stage Heating/Auxiliary Heat Relay

Y1First Stage Cooling Relay

Y2Second Stage Cooling Relay

GFan Relay

Auxiliary EquipmentHUM

HUM

DHUM

DHUM

VENT

Humidifier

Humidifier

Dehumidifier

Dehumidifier

Ventilator

VENTVentilator

O/BReversing Valve (Cooling/Heating)

Golden Valley, MN 55422www.honeywell.com/yourhome

LED STATES:Heat LED Heating ModeCool LED Cooling ModePurge LED Purge ModeFan LED Fan ModeEm Heat LED Em Heat ModeCOMM LED Communications

ZONE LEDS:On Damper open or openingOff Damper closed or closingMOMENTARY PUSH BUTTONSBoot Clears MicroprocessorPurge Override Bypass Purge ModeDiscovery Initiates Discovery Mode

Single transformer heating/coolingsystems require a jumper to beinstalled connecting RH and RC(factory installed).

Power-open/Power-closed(Opposed BladeDamper Motors)

Power-closed/Spring-open(Model ZD)

Power-closed/Spring-open(Model ARD)

DIP SWITCH SETTINGS 1 SEE TABLE ON OFF 2 SEE TABLE 1 0 3 ENVIRACOM FURN NO YES 4 PURGE TIME 2.0 MIN 3.5 MIN 5 PURGE FAN HVAC PANEL 6 PURGE DAMPER NO CHG OPEN 7 # COMP STAGES 1 2 8 HEAT FAN HVAC PANEL 9 HP CHANGEOVER O B 10 UNUSED

#1 #2 CONV HT STG1 1 11 0 20 1 30 0 HP

1

ON

2 3 4 5 6 7 8 9 10

M6

14

XZ

25

36

M4 M1ZONE 1

M6 M4 M1ZONE 2

DAMPERSENVIRACOM BUS

M6 M4 M1ZONE 3

1 2 3 1 2 31 2 3 1 2 3

1 2 3(can connect to any set of 1,2,3 terminals)

1 2 31 2 3 1 2 3

XFRMJumpers

Attach jumpers(factory installedin open position)

if using onlyone transformer.

TM

M20850A

M14628

PRESS LOWER EDGE OF CASE TO LATCH.

ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.

A.

B.

Page 6: 69-1331 - T8635L Microelectronic Communicating ...library.ademconet.com/MWT/fs2/7/5619.pdfT8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT 69-1331—5 6 SETTINGS Thermostat

T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

69-1331—5 6

SETTINGS

Thermostat KeysThe thermostat keys are used to:— Set current day and time.— Program times and setpoints for heating and cooling.— Temporarily override program temperatures.— Display present setting.

— Configure Installer Setup.— Perform Installer System Test.

— Display outdoor temperature (when C7089B is connected).

— Set the System key setting.— Set the Fan key setting.— Set, view and clear the filter setting.

See Fig. 10 for key location.

Fig. 10. Thermostat key locations and descriptions.

System and Fan KeysUse the System and Fan keys on the thermostat to select the system and fan settings.

1. Use the System key setting (Fig. 11) to control the thermostat operation:

Heat: The thermostat controls the heating. When the thermostat is calling for heat, a is indicated in the display.

Cool: The thermostat controls the cooling. When the thermostat is calling for cool, a is indicated in the display.

Auto: The thermostat controls heating and cool-ing, automatically switching from heat to cool based on room temperature and thermostat setpoints.

NOTE: Auto is an option on non-zoned systems using W8635A,B or on zoned systems using W8835.

Off: Both Heating and cooling are off.

Em Heat: The thermostat controls heating. When thermostat is calling for emergency heat, a and Em Ht are indicated in display.

NOTE: Em Heat is an option on systems using the W8635B or W8835 and configured for a heat pump with auxiliary heat.

Fig. 11. System key setting.

IMPORTANT• The T8635L has an adjustable compressor

protection settingit can be set from 0 to 5 minutes.

• The thermostat waits to call for cooling (or heating when used with the heat pumps):—when power is first established,—when a power outage occurs or—when the call has just ended and another

call is immediately attempted.• “wait” is displayed during the compressor pro-

tection period.• To override the compressor protection during

installation, refer to the Installer System Test section.

• To permanently override the compressor pro-tection, see Installer Setup No. 33 and change the setting to 0. See Table 6.

Auto: The thermostat automatically changes between heating and cooling operation, depending on the indoor temperature.

Time Set Program

SystemFilter Fan

RunProgram

Hold Temp

Set CurrentDay/Time

Wake Leave Return Sleep

Day Heat/CoolSettings

DaylightTime

Copy

INCREASE TEMPERATURE SETTING OR SCROLL FORWARD THROUGH INSTALLER SETUP OPTIONS

DECREASE TEMPERATURESETTING OR SCROLL BACKWARD THROUGH INSTALLER SETUP OPTIONS

DISPLAYINFORMATIONSUCH AS PRESENTSETTINGS

RETURN TO NORMALOPERATIONS

ENTER INDEFINITE OR TIMED HOLD MODE

SET CURRENT DAY AND TIME

SET CURRENT ORPROGRAM DAY

CHANGE BETWEEN DAYLIGHT SAVINGS AND STANDARD TIME

INCREASE TIME SETTING OR SCROLL FORWARD THROUGH INSTALLER SETUP AND SYSTEM TEST

DECREASE TIME SETTING OR SCROLL BACKWARD THROUGH INSTALLERSETUP AND SYSTEM TEST

COPY ONE PROGRAMMED DAY TO ANOTHER DAY

SET WAKE TIMES AND SETPOINTS

CHANGE BETWEEN HEATING AND COOLING SETPOINTS

SET LEAVE TIMESAND SETPOINTS

SET RETURN TIMESAND SETPOINTS

SET SLEEP TIMESAND SETPOINTS

M17765

SELECT SYSTEM OPERATION (HEAT, COOL, OFF, AUTO)

SELECT FILTER EXPIRATION IN NUMBER OF DAYS

SELECT FAN OPERATION

Time Set Program

SystemFilter Fan

RunProgram

Hold Temp

Set CurrentDay/Time Wake Leave Return Sleep

DayHeat/CoolSettings

DaylightTime

Copy

System

M17764

SystemHeat

OffCoolAuto

Page 7: 69-1331 - T8635L Microelectronic Communicating ...library.ademconet.com/MWT/fs2/7/5619.pdfT8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT 69-1331—5 6 SETTINGS Thermostat

T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

7 69-1331—5

Em.Ht: Emergency Heat output is controlled as stage 1 heat. Cooling system is off, and compressor is de-energized. Em.Ht and

are displayed when the thermostat is calling for emergency heat.

2. Use the Fan key setting (Fig. 12) to control the system fan:

Auto: The fan operates with the heating and cooling equipment.

On: The fan temporarily operates continu-ously for the current program period. The

is displayed any time the thermostat is calling for fan operation.

NOTE: When used with the W8835 or W8703A Damper Interface Module, a flashing is displayed when one thermostat is call-ing for fan operation while a thermostat in another zone is calling for heat or cool. After the call ends from the other thermostat, the stops flashing and the re-quested call for fan is honored for this zone.

a. Press the Fan key during normal operation to change the fan setting only for the current pro-gram period.

b. To program the fan to operate in Auto or On for each program period individually, see the Owner’s Guide, 69-1332.

Fig. 12. Fan key setting.

Temperature SettingsTo program the time and temperature settings:

1. Refer to Table 3 for the default program time and temperature settings.

2. If the daytime energy savings period is not used, press Leave or Return (period) until the time and temperature is blank.

3. See Owner’s Guide, 69-1332, for complete instructions on changing the program.

Table 3. Default Program Settings.

LED IndicatorsThere are two LED indicators on the top right of the thermostat. See Fig. 13.

• The check (red) LED lights when 24 volts are applied to the L terminal on the W8635B EIM or W8835. This indicates a problem with the heat pump equipment.

Action for Homeowner: Switch to emergency heat and call for assistance.

• The filter (green) LED lights when the filter timer has expired.

Action for Homeowner: Replace the furnace filter or clean the electronic air cleaner cells. Press and hold the Filter key to reset the counter and turn off the LED.

Fig. 13. Check and filter LED locations.

Filter IndicationThis thermostat can track total fan and system run time. This feature can be used to tell the homeowner when to replace the furnace filter or clean the electronic air cleaner cells:

1. Select the number of days for the filter timer to count down from: 0, 15, 30, 60 or 120 days. (One day represents 24 hours of continuous fan/system run time.)

2. To activate this feature, select a value other than 0.

3. See Owner’s Guide, 69-1332, for more detailed information.

Communication Code NumbersCommunication codes 1-3 provide equipment and com-munication status after installation. Communication codes 4-6 can be used during initial system zoning installation when more than one thermostat is con-nected. See Table 4.

Time Set Program

SystemFilter Fan

RunProgram

Hold Temp

Set CurrentDay/Time Wake Leave Return Sleep

DayHeat/CoolSettings

DaylightTime

Copy

M17766

Fan FanOn

Auto

Period Time Heat Setpoint Cool Setpoint Fan SettingWake 6:00 am 70°F (21°C) 78°F (25.5°C) AutoLeave 8:00 am 62°F (16.5°C) 85F (29.5°C) AutoReturn 6:00 am 70°F (21°C) 78F (25.5°C) AutoSleep 10:00 am 62°F (16.5°C) 82F (28°C) Auto

M13375

CHECK (RED) LED

FILTER (GREEN) LED

Page 8: 69-1331 - T8635L Microelectronic Communicating ...library.ademconet.com/MWT/fs2/7/5619.pdfT8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT 69-1331—5 6 SETTINGS Thermostat

T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

69-1331—5 8

INSTALLER SETUP The installer can use the Installer Setup options to change factory settings to customize installations. See Table 6.

NOTE: The Advanced Setup options in Table 7 are for reference only and should remain as set at the factory.

ScopeThe installer can determine if the scope of the Installer Setup change will be globally applied to all thermostat locations in the system (when used in a zoned system); or locally applied to only one thermostat location.

— Local: Only the thermostat where the installer setup option is changed is affected by the change.

— Global: All thermostats are affected by the change.

Zoning Using the T8635L in a zoned application enables these features:— Time synchronization.— Shared filter indication.— Outdoor temperature display in all zones with only

one temperature sensor connected.— Vacation hold in all zones.— Check LED in all zones (when used with the

W8635B or W8835 configured for heat pump).— System switch setting automatically changed for all

zones when used with W8635A or W8635B.— System switch on each T8635 can be set

individually when used with a W8835.— Individual fan control by zone.

Table 4. Communication Code Numbers.

Thermostat Displays This

Communication Code Number Possible Cause Action

1 COM Terminal 1 is not connected at the thermostat or the Equipment Interface Module in a single zone system.

Check the connection on terminal 1 at the thermostat or the Equipment Interface Module. Check for broken wire if the connection is good.

Terminal 1 is not connected correctly at the thermostat in a zoned system.

Check the connection on terminal 1 at the thermostat. Check for broken wire if the connection is good.

Terminal 1 is incorrectly wired with either terminal 2 or terminal 3.

Ensure terminals 1, 2 and 3 are connected to the correct terminals at all devices.

2 COM Communication messages are not being sent or received correctly.

Check the connection on terminal 1 at the thermostat or the Equipment Interface Module. Check for broken wire if the connection is good.

Thermostat component may be defective Replace thermostat.3 COM Terminal 1 is not connected correctly at the

thermostat or the Equipment Interface Module in a single zone system.

Check the connection on terminal 1 at the thermostat or the Equipment Interface Module. Check for broken wire if the connection is good.

Terminal 1 is not connected correctly at the Equipment Interface Module in a zoned system.

Check the connection on terminal 1 at the Equipment Interface Module. Check for broken wire if the connection is good.

The system is not configured correctly. Enter Installer Setup and run Manual Discovery.

Communication messages are not being sent or received correctly.

Check the connection on terminal 1 at the thermostat or the Equipment Interface Module. Check for broken wire if the connection is good.

NOTE: During initial installation of system with more than one thermostat connected, codes 4 COM, 5 COM and 6 COM are intended to assist the installer.

4 COM Duplicate zone numbers. More than one thermo-stat was configured with the same zone number.

Configure each thermostat in the system with a different zone number beginning with one.

5 COM The system found a thermostat with its zone number set to zero. When more than one thermostat is connected to the zoning system, no thermostat can have its zone number set to zero.

Configure the thermostat zone numbers to begin with one.

6 COM The system does not have a thermostat with a zone number one. When more than one thermo-stat is connected to the zoning system, there must be a thermostat with a zone number of one.

Configure the thermostat zone numbers to begin with one.

7 COM The system is configured to use an external filter timer. This is feature that is not yet system-sup-ported.

Configure Installer Setup No. 43 to 0.

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T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

9 69-1331—5

Up to three T8635 Thermostats can be connected to the W8835 or W8703A Damper Interface Module. Up to nine T8535 Thermostats can be used with two addi-tional W8703 Damper Interface Modules:

1. Select zone number for each thermostat in the system.

2. If there is only one thermostat in the system, set the Installer Setup No. 1 to 0. See Table 6.

3. When more than one thermostat in the system, set Installer Setup No.1 at first thermostat to 1, second thermostat to 2, third thermostat to 3, etc, up to nine zones. Do not set more than one ther-mostat in the system to the same zone number.

4. Then match each thermostat with the correspond-ing zone on the W8703 Damper Interface Module or W8835 EnviraZone Panel.

5. Attach the zone number stickers, included with the thermostat, onto the thermostat case on the inside of the thermostat cover. See Fig. 14.

Fig. 14. Zone stickers included with T8635L Thermostat.

IMPORTANTNotice that if more than one thermostat is set to the same zone number, the thermostat dis-plays “4 COM”.

Discovery ModeDiscovery mode begins when T8635L Thermostat and the modules are first installed and power is connected:— The W8835 transmits data based on its configuration

on initial powerup and when its Disovery switch is pressed.

— The W8635 EIM transmits information to T8635L Thermostat that indicates maximum number of stages that are enabled and type of EIM connected.

— The thermostat receives information from the W8635 and then sets the cycle rates and equipment types automatically.

NOTE: While in Discovery mode, the thermostat dis-plays “wait” for 20 seconds.

To change these and other installer settings:— Follow the instructions in Table 6.— Manually changing the stage configuration and cycle

rate settings locks Discovery mode so if power is lost, all custom settings are retained in memory.

If at any time (such as adding new equipment or mod-ules) it is necessary to run Discovery mode:— Enter Installer Setup and follow the instructions in

Table 6.— Manually running Discovery mode unlocks it until

the stage configurations or cycle rates are changed.

Stage ConfigurationTo configure thermostat stages:— W8835 EnviraZone Panel:

a. automatically configures staging based on the W8835 configuration.

b. set Installer Setup No. 5, 8, and 9 to the num-ber of stages controlled. See Table 6.

— W8635A EIM and T8635L:a. automatically configures for two stages of

heat and two stages of cool.b. set Installer Setup No. 5 and No. 8 to 1 for

one stage heat /one stage cool conventional application. See Table 6.

— W8635B EIM and T8635L:a. automatically configures for two stages of

heat and one stage of cool.b. set Installer Setup No. 5 to 1 and Installer

Setup No. 9 to 0 for single-stage heat pump application. See Table 6.

Cycle RateThe thermostat automatically sets the cycle rate based on the information it received during Discovery mode.

To change the default cycle rate settings:— see Table 5 for typical cycle rate settings.— enter Installer Setup and select the desired cycle

rate settings for each stage. (All stages can be set between 1 and 12 cph.)

Default Cycle Rate Settings.

Place one label insideeach thermostat door.

Zone 1

Zone 2

Zone 3

M13426

1st Stage Heat2nd Stage Heat and 3rd

Stage Heat, W8835 1st Stage Cool 2nd Stage CoolW8635A Equipment Interface Module, or W8835 configured for conventional heat

6 cph 6 cph 3 cph 3 cph

1st Stage Heat/Cool 2nd Stage Heat (Auxiliary) Emergency HeatW8635B Equipment Interface Module or W8835 configured for heat pump

3 cph 9 cph 9 cph

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Table 5. Typical Heating Cycle Rate Settings.

Backlight OptionThe T8635L has a backlight that is activated:— on-demand: the thermostat is pre-set to turn on the

backlight when any key is pressed.— continuously: set Installer Setup No. 44 to 1 for

applications where the display is difficult to read due to poor lighting conditions.

Advanced SettingsThese settings are automatically configured during Dis-covery and should not be changed when using the T8635L with the W8635A or W8635B EIM.

The advanced settings, see Table 7, are not available to view or change when the ADV setting is set to Off. When ADV is set to Off, press to scroll to the beginning of the Installer Setup selections.

NOTE: If any of the settings in ADV are inadvertently changed, press Enter and run Discovery mode to reset the settings to the original selection.

ENTERING INSTALLER SETUP To enter Installer Setup:— simultaneously press and hold the , ▲ and ▼ keys

until Installer Setup No. 1 is displayed.

— all display segments appear for approximately three seconds before Installer Setup No.1 is displayed.

— see Fig. 15 and 16.

Fig. 15. LCD segments display.

Fig. 16. Installer Setup number and setting display.

1. To advance to the next Installer Setup No., press the key.

2. To go back, press the key.3. To change an Installer Setup, use the ▲ or ▼ key.4. To exit Installer Setup, press Run Program key.

System Cycles Per HourSteam, Gravity 1

Hydronic Heat, Condensing Gas Furnacesa, Compressor Stages

a High efficiency furnace (90+).

3

Gas or Oil Forced Air, Auxiliary Heat 6Electric Heat, Emergency Heat 9

M14559

Aux Ht

Set Day/TimeSet Program

MonWake Leave Return Sleep

OutdoorRoomFilter

Wait System

Fan

Em Heat

On

Auto

OffCoolAuto

AM

PMHold for

Heat CoolRepl Batt

Recovery

DSTTue Wed Thu Fri Sat Sun

Days

Temporary Setting

Em Ht

M13376

INSTALLER SETUPNUMBER DISPLAY(COLUMN 1 OF TABLE 5)

FACTORY SETTING OR OTHER CHOICE DISPLAY (COLUMN 4OR 5 OF TABLE 5)

Table 6. Installer Setup Numbers and Default Settings and Options.

Installer Setup

Number (Press

key to

change) Description Scope

Default SettingOther Options (Press ▲ or

▼ key to change

Display Description Display Description1 Zone number Local 0 No zoning. 1 to 9 Zone numbers can be set

to zones 1 through 9.LOC Lock/Unlock the system

to Automatic Discovery modea

Global LOC off.

Automatic Discovery mode occurs.

LOC on Automatic Discovery mode does not occur.

dIS Runs Automatic Discovery mode.

Global dIS Press the ▲ key to start Automatic Discovery mode.

— —

4 Fan operation (only when used with W8635A).

Global 0 Conventional applications where equipment controls fan operation in heat mode.

1 Electric heat applications where thermostat controls fan operation in heat mode.

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5 Number of heating stages.

Global 1, 2 Number of heating stages found during Automatic Discovery mode.

0, 1, 2, 3 Select the number of heating stages for this application.

8 Number of cooling stages (maximum for W8635B is one).

Global 1, 2 Number of cooling stages found during Automatic Discovery mode.

0, 1, 2 Select the number of cooling stages for this application.

9 Number of emergency heat stages (only when used with W8835 or W8635B).

Global 1 Number of emergency heating stages.

0, 1, 2 Select the number of emergency heat stages for this application.

13 Adaptive Intelligent Recovery™ (system starts early so setpoint is reached by start of program period).

Global 0 Adaptive Intelligent Recovery™ is activated.

1 Conventional recovery (system starts recovery at period start time).

14 Temperature indication scale (°F or °C)

Global 0 Temperature is indicated in °F.

1 Temperature is indicated in °C.

16 Clock format Global 0 12-hour clock format 1 24-hour clock format.19 Fan overrun in heating

(not implemented for gas/oil heat).

Global 0 0 seconds of fan operation after heating turns off.

1 90 seconds of fan operation after heating turns off.

20 Fan overrun in cooling. Global 0 0 seconds of fan operation after cooling turns off.

1 90 seconds of fan operation after cooling turns off.

25 Keypad lockout. Local 0 No lockout 1 1—Locks out all except ▲ ▼ i, run, dst, and set current day/time.2—Locks out all except i, run, dst, and set current day/time.(In all cases, the combination to enter the Installer Setup and the Installer Test is available.)

30 Minimum deadband between heating and cooling.

Global 3 Heating and cooling setpoints can be set no closer than 3°F (1.5°C) to 10°F(5 °C).

4 to 10 Heating and cooling setpoints can be set no closer than the chosen value between 3° F and 10 °F (1.5 and 5 °C).

33 Minimum off time for cooling and compressor.

Global 5 Five-minute minimum off time for the compressor.

0, 1, 2, 3, 4 or 5

Choose 0, 1, 2, 3, 4 or 5 minute minimum off time for the compressor.

34 Maximum setpoint range stop for heating.

Global 90°F (32°C).

Heating setpoint range can be set no higher than 90°F (30°C).

40°F through 90°F (4.5°C to 32°C).

Maximum setpoint range stop can be set anywhere between 40° F and 90°F in 1°F (0.5°C) increments.

35 Minimum setpoint range stop for cooling.

Global 45°F (7°C).

Cooling setpoint range can be set no lower than 45°F.

45°F through 99°F (7°C to 37°C).

Minimum setpoint range stop can be set anywhere between 45°F and 99°F in 1°F (0.5°C.) increments.

Table 6. Installer Setup Numbers and Default Settings and Options. (Continued)

Installer Setup

Number (Press

key to

change) Description Scope

Default SettingOther Options (Press ▲ or

▼ key to change

Display Description Display Description

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IMPORTANTReview the settings to confirm that they are correct for your application. Press Run Program key to exit Installer Setup. The settings will be saved indefinitely in memory. Upon exiting Installer Setup, “wait” appears in the display for approximately 20 seconds.

Set the time and day on the last thermostat configured after exiting Installer Setup. See Setting Current Day and Time section.

37 Field calibration adjustment.

Local 0 No difference between displayed temperature and actual room temperature.

-3, -2, -1, 1, 2, 3

Display adjusts to the chosen °F higher or lower than room temperature.

43 Filter timer. Global 0 Thermostat filter timer is used.

1 External filter timer is used.

44 Backlight operates continuously or with a key press.

Local 0 Backlight operates with a key press.

1 Backlight operates continuously.

45 Outdoor temperature sensor.

Local 0 Outdoor temperature sensor is not configured.

1 Outdoor temperature sensor is configured.

46 Enable humidity display. Global 0 Humidity display disabled.

1 Humidity display enabled.

51 Stage 1 heat cycle rate. Global 6b Cycle rate of equipment (cph).

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12

Cycle rate of equipment (cph).52 Stage 2 heat cycle rate.

55 Emergency heat cycle rate.

Global 9 Cycle rate of equipment (cph).

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12

Cycle rate of equipment (cph).

57 Stage 1 cool cycle rate. Global 3 Cycle rate of equipment (cph).

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12

Cycle rate of equipment (cph).58 Stage 2 cool cycle rate.

ADV Advance configuration menu to review/modify equipment ID and type.

ADV off.

No access to Advanced Installer Setup No. 61-63, 65-69, 71-73, 75-79.

ADV on Access to Advanced Installer Setup No. 61-63, 65-69, 71-73, 75-79.

a This value is not installer adjustable. If any of these Installer Setup No. are changed: 4, 5, 8, 9, 51, 52, 55-ADV from Table 6 and 62-63, 65-69, 71-73, 75-80 from Table 7, the settings are locked and Automatic Discovery cannot occur. To unlock Discovery, advance to “dIS” and press the ▲ key to manually initiate Discovery mode. During Dis-covery, “wait” appears in the display for approximately 20 seconds and the thermostat is not functional.

b 3 cph when used with W8635B or W8835 configured for heat pump; 9 cph when used with the T8635 set for electric heat.

Table 6. Installer Setup Numbers and Default Settings and Options. (Continued)

Installer Setup

Number (Press

key to

change) Description Scope

Default SettingOther Options (Press ▲ or

▼ key to change

Display Description Display Description

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SETTINGS

Setting Current Day and Time1. Press Set Current Day/Time key.

NOTE: On initial powerup or after an extended power loss, 1:00pm flashes in the dis-play until a key is pressed.

2. Press Day key until the current day is displayed.

Table 7. Advanced Setup Options.(For reference only. Do not change any of these settings.)

Advanced Installer Setup

Number (Press

key to

change) DescriptionDefault Setting

Other Options Press ▲ or ▼ key to change)

Display Description Display Description62 Equipment Type 1st Stage

of Heat1, 2, 3, 4 or 5

1 - Natural gas or oil heating.2 - Free heating (outside) air

without ventilation.3 - Free heating (outside) air

with ventilation.4 - Compressor heating (heat

pump).5 - Electric heating.Default display indicates the equipment that was found during Discovery mode.

1, 2, 3, 4 or 5

1 - Natural gas or oil heating.

2 - Free heating (outside) air without ventilation.

3 - Free heating (outside) air with ventilation.

4 - Compressor heating (heat pump).

5 - Electric heating.Default display indicates the equipment that was found during Discovery mode.

63 Equipment Type 2nd Stage of Heat

64 Equipment Type 3rd Stage of Heat

65 Equipment Type 1st Stage of Emergency Heat

67 Equipment Type 2nd Stage of Emergency Heat

68 Equipment Type 1st Stage of Cool

1, 2, 3, 4 or 5

1 - Evaporative cooling.2 - Free cooling (outside) air

without ventilation.3 - Free cooling (outside) air

with ventilation.4 - Compressor cooling.Default display indicates the equipment that was found during Discovery mode.

1 - Evaporative cooling.2 - Free cooling (outside)

air without ventilation.3 - Free cooling (outside)

air with ventilation.4 - Compressor cooling.Default display indicates the equipment that was found during Discovery mode.

69 Equipment Type 2nd Stage of Cool

70 Equipment Type 3rd Stage of Cool

72 Equipment ID 1st Stage of Heat

0, 1, 2 or 3

This is a unique identification number corresponding to the equipment assigned the same number.

Default display indicates the equipment that was found during Discovery mode.

0, 1, 2 or 3

This is a unique identification number corresponding to the equipment assigned the same number.

73 Equipment ID 2nd Stage of Heat

74 Equipment ID 3rd Stage of Heat

76 Equipment ID 1st Stage of Emergency Heat

77 Equipment ID 2nd Stage of Emergency Heat

78 Equipment ID 1st Stage of Cool

79 Equipment ID 2nd Stage of Cool

80 Equipment ID 3rd Stage of Cool

Time Set Program

SystemFilter Fan

RunProgram

Hold Temp

Set CurrentDay/Time Wake Leave Return Sleep

DayHeat/CoolSettings

DaylightTime

Copy

M17767

Set CurrentDay/Time

Set Day/Time

Mon

PM Time Set Program

SystemFilter Fan

RunProgram

Hold Temp

Set CurrentDay/Time Wake Leave Return Sleep

DayHeat/CoolSettings

DaylightTime

Copy

M17768

Day

Set Day/Time

PM

Tue

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3. Press or until the current time is dis-played.

NOTE: Tapping the Set Current Day/Time key changes the time in one-hour incre-ments.

4. If the current time is Daylight Savings Time, press Daylight Time key to display DST.

5. Press Run Program key.

Programming See the Owner’s Guide, 69-1332, for complete pro-gramming instructions.

INSTALLER SYSTEM TESTUse the Installer System Test to check the thermostat and W8635 Equipment Interface Module operation for each thermostat in the system. Table 8 lists the avail-able system tests.

IMPORTANTWhen used in zoning, you must exit Installer System Test before entering Installer System Test at another thermostat.

See Table 9 for Installer System Test descriptions.

Table 8. Installer System Tests.

CAUTIONEquipment Damage Hazard.Minimum compressor off-time is bypassed during Installer System Test.Do not allow compressor rapid cycling (on and off). Observe compressor protection period.

Starting Installer System TestPress and hold the ▲ and ▼ keys at the same time until 10 appears. All segments of the display are shown before the test number 10 appears. See Fig. 15 and 17.

Fig. 17. Test number display.

Time Set Program

SystemFilter Fan

RunProgram

Hold Temp

Set CurrentDay/Time Wake Leave Return Sleep

DayHeat/CoolSettings

DaylightTime

Copy

M17769

TimeSet Day/Time

AM

Tue

Time Set Program

SystemFilter Fan

RunProgram

Hold Temp

Set CurrentDay/Time Wake Leave Return Sleep

DayHeat/CoolSettings

DaylightTime

Copy

M17770

DaylightTime

Set Day/Time

AM

Tue

Time Set Program

SystemFilter Fan

RunProgram

Hold Temp

Set CurrentDay/Time Wake Leave Return Sleep

DayHeat/CoolSettings

DaylightTime

Copy

M17771

RunProgram Wake

Room

System

Fan

Heat

Auto

AM

DSTTue

Test Number System Test Description10-12 Heating stages can be turned on and off in

sequence.20-21 Emergency heating can be turned on and off.30-32 Cooling stages can be turned on and off in

sequence.40-42 Fan and damper test.60 Keyboard keys test.70-74 Thermostat information, including date code

and software versions, are displayed.

M10257ATEST NUMBER

Table 9. Installer System Test Options.

Key to Press Test Number DescriptionHeating Equipment System Test

10 Enter Heating Equipment system test.

▲ 11 First Stage Heat turns on.

▲ 12 Second Stage Heat turns on.

▼ 11 Second Stage Heat turns off.

▼ 10 First Stage Heat turns off.

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CHECKOUT

Outdoor Temperature SensorAllow the C7089B Outdoor Temperature Sensor to absorb the outdoor air for a minimum of five minutes before taking a reading.

TROUBLESHOOTING GUIDERefer to Table 10 for troubleshooting information.

Emergency Heat System Test (available only when using W8635B)20 Enter Emergency Heat Equipment system test.

▲21 Emergency Heat turns on.

▼20 Emergency Heat turns off.

Cooling Equipment System Test30 Enter Cooling Equipment system test.

▲31 First Stage Cool turns on.

▲32 Second Stage Cool turns on (W8635A only).

▼31 Second Stage Cool turns off (W8635A only).

▼30 First Stage Cool turns off.

Fan and Damper Test Damper Test available only when using W8703A)40 Enter Fan and Damper test.

▲41 Fan turns on; damper for this zone opens.

▲42 Damper closes for this zone (if not already closed); fan stays on.

▼41 Damper opens for this zone.

▼40 Fan turns off.

Key Operation Test 60 Enter Key Operation test.

Press any key to test if the key is functional. Each time a key is pressed, a different number is displayed. This indicates the key is functioning properly. Pressing enters the next test.

Thermostat Information70 Enter Thermostat Information mode.

▲71 Production date code is displayed. The first two large digits are the month

and the third digit is the last digit of the year (example: 031 = March 2001).

▲72 Software identification code is displayed.

▲73 Software revision number is displayed.

▲74 EEPROM identification code is displayed.

Exit Installer Test ModeRun Program key Thermostat returns to normal operating mode.

Table 9. Installer System Test Options. (Continued)

Key to Press Test Number Description

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Table 10. Troubleshooting Information.

Symptom Possible Cause ActionDisplay does not come on.

Thermostat is not being powered. Check if the thermostat is mounted and latched on the wallplate; if not:

—mount and latch the thermostat on the wallplate.Check if the circuit breaker is tripped; if it is:

—reset the circuit breaker.Check if the fuse in the fuse box is blown; if it is:

—replace the fuse.Check if the power switch at the equipment is in the Off position; if it is:

—set to the On position.Check for 24 vac on terminals 2 and 3:

—replace any broken wires.If 24 Vac is present on terminals 2 and 3, replace the thermostat.

“1 COM”, “2 COM”, or “3 COM” is displayed.

Thermostat is not communicating correctly with the W8835 or W8635A,B.

Check the connection to terminal 1 at the thermostat and W8835 or W8635 EIM:

—replace any broken wires.—cycle power.

“4 COM” is displayed on left side of the display.

More than one thermostat is set to the same zone number.

Enter Installer Setup and change Installer Setup Number 1 to another value (1-3) that is different from the thermostat with the same zone number.

5 COM Zone 0 was found in a zoned system

Enter Installer Setup and change Installer Setup Number 1 to another value (1-9) that corresponds to the zone it is controlling.

6 COM Zone 1 was not found. Enter Installer Setup on the Zone 1 Thermostat and change Installer Setup Number 1 to 1.

7 COM System is configured to use external timer.

The external timer function is not currently available. Enter Installer Setup and change Installer Setup 43 to 0.

System switch setting displays “off only.”

During Automatic Discovery mode, the thermostat did not correctly set the number of heat or cool stages.

Run Automatic Discovery mode by cycling power to the equipment.Manually run Discovery mode in Installer Setup.Manually configure heat and/or cool stages (Installer Setups 5, 8 and 9).

Thermostat is calling for heat or cool; or displays and the corresponding damper does not open.

Thermostat zone number is not set to the corresponding W8703 zone number.

Terminal 1 on W8703 Damper Interface Module is not properly connected.

W8703 Damper Interface Module is defective.

Set zone number at the thermostat to correspond with the correct zone number for the W8703 Damper Interface Module.

Properly connect terminal 1 on the W8703 Damper Interface Module.

If the W8703 indicates the damper is closed (red LED lights), replace the W8703 Damper Interface Module.

Heating does not come on. System on indicator displays.

Communication is not being completed.

Heat load at W8635 EIM is not connected correctly.

End the call and repeat the call. Check the Flash Com OK LED on the W8835 or W8635 EIM while the call is being made.If the Flash Com OK LED does not blink:

—check communication bus wiring.

If the Flash Com OK LED blinks correctly:—check that 24 Vac is present at W1 or W1/Y1 terminal, depending on which equipment module is being used.

If 24 Vac is not present, check the R to Rh connection. If the connection is good, replace the W8835 or W8635 EIM.

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Cooling does not come on. System on indicator displays.

Communication is not being completed.

Cool load at W8635 EIM is not connected correctly.

End and repeat the call for cool. Check the Flash Com OK LED on the W8635 EIM or W8835 while the call is being made. If the Flash Com OK LED does not blink:

—check communication bus wiring.

If the Flash Com OK LED blinks correctly:—check that 24 Vac is present at Y1 or W1/Y1 terminal,

depending on which EIM is being used.If 24 Vac is not present, check R to Rc and/or Rh connections. If the R to Rc and/or Rh connections are good, replace the W8635 EIM or W8835.

“wait” is displayed and the call for Cool (or Heat when used in a heat pump application) has not started.

Compressor protection is in effect. Compressor protection can be set from 0 to 5 minutes to prevent compressor damage due to rapid cycling. Wait until the compressor protection period expires.To bypass compressor protection during the installation phase, see the Installer System Test section.

2nd stage heat or cool does not energize (only when used with W8635A).

Stage configuration is not set correctly to match the number of selected stages.

Cool load at W8635 EIM is not connected correctly.

Set the Stage configuration in Installer Setup for two stages of heat and/or two stages of cool.

Check that 24 Vac is present at Y2, W2 or Aux. Terminal, depending on EIM used. If 24 Vac is not present, all connections are good and the thermostat is properly configured, replace W8635A EIM or W8835.

Emergency Heat does not energize (only when used with W8635B or W8835).

Emergency Heat load at W8635 or W8835 is not connected correctly.

Check that 24 Vac is present at E terminal. If 24 Vac is not present, all connections are good, and the thermostat is properly configured, replace W8635B or W8835.

Emergency Heat can not be selected with the System switch (W8635B only).

Stage configuration is not set correctly to match the number of stages selected.

Set the Stage configuration, Installer Setup No. 9 to 1, see table 5 for one stage of Emergency Heat.

Fan does not come on with a call for electric heat.

Electric heat setting is not configured.

Fan load at the W8835 or W8635 EIM is not connected correctly.

Set Installer Setup No. 4 to 1 for electric heat, see Table 6.

Check that 24 Vac is present at G terminal. If 24 Vac is not present, all connections are good, and the thermostat is configured, replace the W8635 EIM or W8835.

The is flashing and the damper does not open.

Thermostat is waiting for a call for heat or cool to end in another zone before opening this zone damper.

Wait until call from other zone ends.

Temperature setting does not change (example: cannot set the heating higher or the cooling lower).

The upper or lower temperature limits are reached.

Check temperature setpoint limits; setpoint limit ranges are:

—heating: 40° to 90°F (4.5° to 32°C).—cooling: 45° to 99°F (7° to 37°C).

See Installer Setup no. 34 and no. 35 to change the setpoint limits, see Table 6.

Fan runs continuously.

Fan setting set to On or programmed to On.

Pressing the Fan key changes the fan from On to Auto or vice versa for the duration of the current program period. To set the fan to run continuously for all periods, program the fan to On for each period and day.

The green LED is on.

Filter expired. Replace filter or clean electronic air cleaner cells. Press and hold the filter key to reset the timer.To disable the filter timer, select 0 as the timer value.

The red LED is on. Check LED. 24 Vac is present at the L terminal on the W8835 or W8635B EIM.

Check heat pump manufacturer instructions.

Table 10. Troubleshooting Information. (Continued)

Symptom Possible Cause Action

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Outdoor temperature not displayed or is incorrect.

Outdoor temperature setting is not enabled in Installer Setup.

Outdoor sensor is not connected, is connected incorrectly or is out-of-range.

Outdoor sensor is configured at more than one thermostat zone location.

Filter expired.

Install one C7089B Outdoor Temperature Sensor to OT terminals on one thermostat in the system and configure Installer Setup No. 45 to 1, see Table 6, only at the zone where the outdoor sensor is connected.

If the outdoor sensor is not connected or is out-of-range (below –40°F or above 120°F) “- -” is displayed on the thermostat where the outdoor sensor is located. All other thermostats do not display an outdoor temperature until the sensor is in range or connected correctly.

Outdoor temperature alternates between displaying outdoor temperature and “- -” . Configure only the thermostat where the outdoor sensor is connected.

Press key twice for outdoor temperature when filter expiration displays. Refer to the Filter Indication section.

Heat or cool turns on before programmed time.

Adaptive Intelligent Recovery™ is on.

Adaptive Intelligent Recovery™ brings on the heat or cool early to meet the temperature set for the programmed period. To disable Adaptive Intelligent Recovery™, configure Installer Setup No. 13 to 1, see Table 6.

Table 10. Troubleshooting Information. (Continued)

Symptom Possible Cause Action

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69-1331—5 G.H. Rev. 02-03 Printed in Taiwan R.O.C. www.honeywell.com/yourhome

Automation and Control SolutionsHoneywell International Inc. Honeywell Limited-Honeywell Limitée1985 Douglas Drive North 35 Dynamic DriveGolden Valley MN 55422 Scarborough, Ontario

M1V 4Z9

T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT