426 06 1701 03March 2010

Specifications subject to change without notice.

EHTA Series Electric HeatersPAT3 Series Package Air Conditioners

PHT3 Series Package Heat Pumps

Installation Instructions

TABLE OF CONTENTSGENERAL 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SAFETY CONSIDERATIONS 1. . . . . . . . . . . . . . . . . . . . . . PACKAGE CONTENTS 1. . . . . . . . . . . . . . . . . . . . . . . . . . . DESCRIPTION AND USAGE 1. . . . . . . . . . . . . . . . . . . . . ELECTRIC HEATER USAGE CHART 2. . . . . . . . . . . . . . MINIMUM AIRFLOW CHART 2. . . . . . . . . . . . . . . . . . . . . . ELECTRIC HEATER INSTALLATION 2. . . . . . . . . . . . . . ELECTRIC CONNECTION 7. . . . . . . . . . . . . . . . . . . . . . . START−UP 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TROUBLE SHOOTING 7. . . . . . . . . . . . . . . . . . . . . . . . . . . WIRING DIAGRAMS 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GENERALIMPORTANT: Read these instructions completely beforeattempting to install the accessory electric heaters.

SAFETY CONSIDERATIONSImproper installation, adjustment, alteration, service,maintenance, or use can cause explosion, fire, electricalshock, or other conditions which may cause death,personal injury, or property damage. Consult a qualifiedinstaller, service agency, or your distributor or branch forinformation or assistance. The qualified installer oragency must use factory−authorized kits or accessorieswhen modifying this product. Refer to the individualinstructions packaged with the kits or accessories wheninstalling.Follow all safety codes. Wear safety glasses, protectiveclothing, and work gloves. Have a fire extinguisheravailable. Read these instructions thoroughly and followall warnings or cautions included in literature andattached to the unit. Consult local building codes, thecurrent editions of the National Fuel Gas Code (NFGC)NFPA 54/ANSI Z223.1, and the National Electrical Code(NEC) NFPA 70.In Canada refer to the current editions of the NationalStandards of Canada CAN/CSA−B149.1 and .2 NaturalGas and Propane Installation Codes, and CanadianElectrical Code CSA C22.1.Recognize safety information. This is the safety−alertsymbol . When you see this symbol on the unit and ininstructions or manuals, be alert to the potential forpersonal injury. Understand the signal words DANGER,WARNING, and CAUTION. These words are used withthe safety−alert symbol. DANGER identifies the most

serious hazards which will result in severe personal injuryor death. WARNING signifies hazards which could resultin personal injury or death. CAUTION is used to identifyunsafe practices which may result in minor personalinjury or product and property damage. NOTE is used tohighlight suggestions which will result in enhancedinstallation, reliability, or operation.

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result inpersonal injury or death.

Before performing service and maintenanceoperations on unit, turn off main power switch tounit. If gas unit, shut off gas supply beforeshutting off main power.

TAG DISCONNECT SWITCH WITH A SUITABLELOCK AND WARNING LABEL.

! WARNING

PACKAGE CONTENTS

ELECTRIC HEATER PACKAGE CONTENTS

1. Heater assembly2. UPC heater label3. Installation Instructions4. Identification label5. Wiring label6. Wire connectors (2)7. Wire tires−6” (5)8. Screws #10B (4)9. Ground lug (1) (See Fig. 7)10. Screws 3/8−16 (3)11. Plug attachment plate12. Washers (3)

INSTALLATIONDESCRIPTION AND USAGEThese heaters are comprised of a separate heater modulemounted on the blower inlet and remote mounted controlslocated in the unit control box. Heater models are providedwith single point electrical connections for powering boththe heater and the unit.

These heaters are intended for use only in packaged unitsas noted in Table 1.

2 426 06 1701 03Specifications subject to change without notice.

Table 1 ELECTRIC HEATER USAGE CHART

UnitNominal Capacity

(kW)Circuit Breaker

(Yes/N0) Stages Used With Heater Part #

PHT3

208/230 − Single Phase − 60 Hz (024−060)3.8 / 5.0 NO 1 024 − 042 EHTA05K0N3.8 / 5.0 YES 1 048 − 060 EHTA05K0B5.6 / 7.5 NO 2 024 EHTA07K0N5.6 / 7.5 YES 2 030 − 060 EHTA07K0B7.5 / 10.0 YES 2 ALL EHTA10K0B11.3 / 15.0 YES 2 036 − 060 EHTA15K0B15.0 / 20.0 YES 2 036 − 060 EHTA20K0B

PAT3

3.8 / 5.0 NO 1 ALL EHTA05K0N3.8 / 5.0 YES 1 NONE EHTA05K0B5.6 / 7.5 NO 2 ALL EHTA07K0N5.6 / 7.5 YES 2 NONE EHTA07K0B7.5 / 10.0 NO 2 024 − 042 EHTA10K0N7.5 / 10.0 YES 1 048 − 060 EHTA10K0B11.3 / 15.0 YES 2 030 − 060 EHTA15K0B15.0 / 20.0 YES 2 036 − 060 EHTA20K0B

Table 2 MINIMUM AIRFLOW FOR HEATER OPERATION

kW

PAT3 PHT3Unit Size

024 030 036 042 048 060 024 030 036 042 048 0605 400 450 450 450 450 450 500 600 600 600 600 600

7.5 550 600 600 600 600 600 650 800 800 800 800 80010 650 800 800 800 800 800 750 1050 1050 1050 1050 105015 850 850 850 850 850 1150 1150 1150 115020 900 900 900 900 1200 1200 1200 1200

HEATER INSTALLATION

1. Open all electrical disconnects and install lock−outtag before beginning any installation or service work.

2. Check for proper equipment model number from listin Table 1.

3. Remove unit side panel to access blower compart-ment (See Fig. 1).

4. Disconnect wiring to motor by removing speed selec-tion and power plugs from bottom of motor.

5. Remove rear blower support bracket; set bracket andattached motor wiring on top of unit.

6. Remove screws securing blower to front blower sup-port bracket; slide blower out of unit.

7. Open heater package and remove heater module;secure heater module to standoffs on blower inletwith (3) screws and (3) washers provided (see Fig. 2)and reinstall heater/blower assembly.

8. Reinstall rear motor support bracket and attachedmotor wiring. Do not reattach motor wiring plugs tomotor at this time.

9. Remove heater wiring cover plate from interior parti-tion between blower and control box (See Fig. 3) andinstall heater wiring plug attachment plate providedwith heater.

10. Remove unit side panel to access unit control boxcompartment.

11. Open heater package and remove heater controlpanel; set heater control panel on top of unit (See Fig.4).

12. Heater control panel will have black and yellow powerwires ending in panel mounted plugs; reach throughlarge rectangular opening in control panel and snapthese plugs into mating openings in heater wiring plugattachment plate installed in step 9 above (See Fig.3).

13. Rotate heater control panel into unit control box areaand locate it into top left corner of control box; secureheater control panel to unit control box with (4) screwsprovided (See Fig. 5).

14. Low voltage wires from heater control panel termin-ate in a harness plug; the mating 5 pin connector islocated on the unit fan control board at position P4.Open flexible ”fishpaper“ insulation cover providedwith unit control box and route heater low voltage har-ness along the bottom of the unit control box. Connectmating heater and fan control board plugs, dresswires and secure them to existing unit control wireswith wire ties provided (See Fig. 6).

15. Re−close flexible ”fishpaper” insulation cover; insureunit black and yellow power “pigtails” from contactorare properly routed through insulation cover (See Fig.7).

426 06 1701 03 Specifications subject to change without notice. 3

16. Connect the black and yellow (blue for 3 phase) ”pig-tails” from the heater control panel to the black andyellow pigtails from the unit contactor using the con-nectors provided with the heater.

17. Attach the adhesive backed wiring label provided withthe heater to the ”fishpaper” insulation cover.

18. Return to blower compartment and locate black andyellow power wires from heater module; these wireswill terminate in plug connectors that mate with theplug from the heater control installed in Step 13above. Snap these connectors into place; dress andsecure wires to fan wires with wire ties provided (SeeFig. 8).

19. Determine minimum airflow for safe heater operationfrom Table 2 and relocate black wire in motor fanspeed selection plug to required speed tap position(See Fig. 9). This wire may easily be relocated to therequired position by depressing the associated tab inthe front of the plastic housing, removing wire fromthe back of the housing and reinserting it into the

proper position (listen for the “click“ upon reinsertionto insure that the terminal is properly seated). Refer tounit installation instructions for airflow vs speed tapinformation.

20. Reinsert motor power plug into the rear opening in themating motor housing and then reinsert the motorspeed selection plug. Note that these plugs are inter-locked both to the motor housing and each other toinsure correct reinsertion.

21. Reattach the blower access panel and proceed toELECTRICAL CONNECTION section.

The circuit breakers supplied with these heaters areconsidered supplemental overcurrent protection and notbranch protection per the National Electrical Code (NFPA70−2008) article 422−11(f)

These heating elements shall be connected in protectedsubdivided circuits if any total concurrent loads of the unitexceeds 48 amps based on nameplate ratings perUL−1995 Section 30.

Figure 1 Indoor Blower Compartment

4 426 06 1701 03Specifications subject to change without notice.

Figure 2 Attach Heater Module

Figure 3 Inside Blower Compartment

426 06 1701 03 Specifications subject to change without notice. 5

Figure 4 Unit Control Box Compartment

Figure 5 Heater Control Panel Installation

6 426 06 1701 03Specifications subject to change without notice.

Figure 6 Heater Low Voltage Connection

Figure 7 Unit Power Connection

SINGLE POINT TERMINALS

426 06 1701 03 Specifications subject to change without notice. 7

Figure 8 Power Connection to Heater

Figure 9 Speed Taps

ELECTRICAL CONNECTION1. Open all electrical disconnects and install lock−out tag

before beginning any installation or service work.2. All electrical connections, wire sizes and type of conduit

shall meet the National Electric Code and State and LocalCodes. Main power supply, minimum wire sizes, circuits,fusing, etc. are shown on schematic wiring diagrams.

Use minimum 75° C copper wire only.

3. Refer to base unit instructions for recommended wiringprocedures.

4. Connect low voltage wires as shown in unit schematicdiagrams. These connections must be made in the 24−v.barrier section inside the unit panel (See Fig. 7).

5. Connect field power wiring as shown in heater wiringdiagram . All connections should be made inside the

unit and comply with the National Electric Code andState and Local Codes. Heaters with factory installedcircuit breakers may be installed on a branch cirecuitprotected by either a fuse or circuit breaker. For allother heaters, the branch circuit must be protectedby a fuse or circuit breaker supplied by others.

6. Make all high voltage wire splice connections inside theunit control box. Use splice connectors provided. Properlyinsulate connectors. Separate all wires from incomingpower leads.

7. Be sure that all electrical terminal connections, clamps,screws, etc. are tight before proceeding.

8. Check wiring diagram supplied with heater for specificconnections and information (See Fig. 10 thru 17).

9. Check operation as described in Start−Up section.

ELECTRICAL SHOCK HAZARD

!

Failure to follow this warning could result in personal injury,death and/or property damage.

Before performing installation, service, or maintenanceoperations on unit, turn off unit main power switch and installlockout tag. There may be more than on disconnect switch.Turn off accessory heater power switch if applicable.

Unit MUST be grounded before making line voltageconnections. Do NOT fuse ground or neutral conductors.

START−UP

ELECTRICAL SHOCK HAZARD

!

Failure to follow this warning could result in personal injury,death and/or property damage.Before proceeding, verify that all wiring is correct per factoryapproved schematic. Notify factory immediately of anydiscrepancies.

1. Refer to base unit installation instructions as required.2. Check for loose terminal connections.3. Check that all fuse and circuit breaker short circuit

interrupting ratings are adequate.4. Turn on unit and heater power.5. Set thermostat to call for heat.6. Check operation of heater.7. Check that airflow across the heater is at or above the

minimum recommended CFM requirement (See Table 2).Adjust indoor blower heat speed as required.

8. Any modifications or repairs to this equipment withoutwritten permission from the factory will be done at theinstaller’s own risk and expense.

TROUBLE SHOOTING1. Circuit Breakers − Malfunction will interrupt power to the

unit. Check for cause of failure, replace fuses.2. Limit Switch − Malfunction prevents heating element(s)

from being energized. Replace switch if malfunctionoccurs.

3. Relay − Malfunction will not allow heater to energize.Replace faulty relay. Do not attempt to repair.

8 426 06 1701 03Specifications subject to change without notice.

HE

AT

ER

WIR

ING

Figure 10

Figure 11

426 06 1701 03 Specifications subject to change without notice. 9

HE

AT

ER

WIR

ING

Figure 12

Figure 13

10 426 06 1701 03Specifications subject to change without notice.

HE

AT

ER

WIR

ING

Figure 14

Figure 15

426 06 1701 03 Specifications subject to change without notice. 11

HE

AT

ER

WIR

ING

Figure 16

Figure 17