packaged terminal air conditioners - This is a secure site - Whirlpool

PACKAGED 

TERMINAL 

AIR 

CONDITIONERS 

CONSUMER SERVICES TECHNICAL 

EDUCATION GROUP PRESENTS R-99 

Models: ATE0743SPP, ATE0943SPP, ATE1243SPP, ATE1545SPP, 

ATR0743SPP, ATR0943SPP, ATR1243SPP, ATR1545SPP 

ATE0953SPP, ATE1253SPP, ATE1555SPP, 

ATR0953SPP, ATR1253SPP, ATR1555SPP, 

ATE0743RPP, ATE0943RPP, ATE1243RPP, ATE1545RPP, 

ATR0743RPP, ATR0943RPP, ATR1243RPP, ATR1545RPP 

JOB AID 

Part No. 8178315

FORWARD 

This Whirlpool Job Aid, “Packaged Terminal Air Conditioners” (Part No. 8178315), provides the 

technician with information on the installation, operation, and service of the Packaged Terminal Air 

Conditioners . It is to be used as a training Job Aid and Service Manual. For specific information 

on the model being serviced, refer to the “Use and Care Guide,” or “Tech Sheet” provided with the 

air conditioner. 

The Wiring Diagrams and Strip Circuits used in this Job Aid are typical and should be used for 

training purposes only. Always use the Wiring Diagram supplied with the product when servicing 

the unit. 

GOALS AND OBJECTIVES 

The goal of this Job Aid is to provide detailed information that will enable the service technician to 

properly diagnose malfunctions and repair the Packaged Terminal Air Conditioners. 

The objectives of this Job Aid are to: 

• Understand and follow proper safety precautions. 

• Successfully troubleshoot and diagnose malfunctions. 

• Successfully perform necessary repairs. 

• Successfully return the air conditioner to its proper operational status. 

WHIRLPOOL CORPORATION assumes no responsibility for any repairs made 

on our products by anyone other than Authorized Service Technicians. 

Copyright © 2004, Whirlpool Corporation, Benton Harbor, MI 49022 

- ii -

TABLE OF CONTENTS 

- iii - 

Page 

GENERAL............................................................................................................................... 1-1 

Whirlpool Model & Serial Number Designations ................................................................ 1-1 

Model & Serial Number Label & Wiring Diagram Locations .............................................. 1-2 

Specifications..................................................................................................................... 1-3 

Whirlpool Packaged Terminal Air Conditioner (PTAC) And 

Packaged Terminal Heat Pump (PTHP) Warranty ......................................................... 1-4 

INSTALLATION INFORMATION ........................................................................................... 2-1 

Electrical Requirements ..................................................................................................... 2-1 

Drain Kit Installation ........................................................................................................... 2-2 

Chassis Installation ............................................................................................................ 2-5 

Remote Wall Thermostat Installation ................................................................................. 2-9 

PRODUCT OPERATION ........................................................................................................ 3-1 

Theory Of Operation .......................................................................................................... 3-1 

Refrigeration Operation .................................................................................................. 3-1 

Heat Pump Operation .................................................................................................... 3-3 

Reversing Valve Operation ............................................................................................ 3-4 

Remote Thermostat Operation....................................................................................... 3-5 

Heat Pump Function ...................................................................................................... 3-7 

Operating The Controls ..................................................................................................... 3-8 

COMPONENT ACCESS ......................................................................................................... 4-1 

Component Locations ........................................................................................................ 4-1 

Removing The Indoor Thermostat, Mode (System) Switch, And Heat Anticipator ............ 4-2 

Removing The Power Supply Cord ................................................................................... 4-4 

Removing The Defrost Thermostat.................................................................................... 4-5 

Removing The Hot Start Relay And Hot Start Sensor ....................................................... 4-6 

Removing The Capacitor & Fan Cycle Switch ................................................................... 4-7 

Removing The Remote Control Unit Fan Switch ............................................................... 4-8 

Removing The Heater & Limit Switch ................................................................................ 4-9 

Removing The Fan Motor ................................................................................................ 4-10 

Removing The Condensate Valve Bellows...................................................................... 4-13 

Removing The Overload Protector And The Compressor ............................................... 4-14 

Removing The Evaporator ............................................................................................... 4-16 

Removing The Condenser ............................................................................................... 4-18 

Removing The Solenoid Coil & Reversing Valve............................................................. 4-20

COMPONENT TESTING ........................................................................................................ 5-1 

Indoor Thermostat ............................................................................................................. 5-1 

Mode (System) Switch ....................................................................................................... 5-2 

Heat Anticipator ................................................................................................................. 5-2 

Defrost Thermostat (Emergency Heat Switch) .................................................................. 5-3 

Hot Start Relay .................................................................................................................. 5-4 

Hot Start Sensor ................................................................................................................ 5-4 

Capacitor ........................................................................................................................... 5-5 

Fan Cycle Switch & Remote Control Unit Fan Switch ....................................................... 5-5 

Heater & Limit Switch ........................................................................................................ 5-6 

Fan Motor ......................................................................................................................... 5-6 

Overload Protector............................................................................................................. 5-7 

Compressor ....................................................................................................................... 5-7 

Solenoid Coil...................................................................................................................... 5-8 

DIAGNOSIS & TROUBLESHOOTING ................................................................................... 6-1 

Diagnosing The Sealed System ........................................................................................ 6-1 

Troubleshooting Charts ..................................................................................................... 6-7 

WIRING DIAGRAMS & STRIP CIRCUITS ............................................................................. 7-1 

Wiring Diagrams ................................................................................................................ 7-5 

Strip Circuits .................................................................................................................... 7-10 

TECH TIPS ............................................................................................................................. 8-1 

Routine Maintenance ......................................................................................................... 8-1 

Accessories ....................................................................................................................... 8-2 

Optional Desk Control Unit ................................................................................................ 8-4 

General Troubleshooting ................................................................................................... 8-5 

- iv -

WHIRLPOOL MODEL & SERIAL NUMBER DESIGNATIONS 

MODEL NUMBER 

SERIAL NUMBER 

GENERAL 

MODEL NUMBER 

PRODUCT GROUP 

A = AIR CONDITIONER 

A T R 12 4 3 S P P 0 

PRODUCT IDENTIFICATION 

T = PTAC, WHIRLPOOL 

MODEL TYPE 

R = HEAT PUMP W/AUXILIARY HEAT 

E = COOLING W/ELECTRIC HEAT 

NOMINAL COOLING CAPACITY 

07 = 7,000 BTU/HR 

09 = 9,000 BTU/HR 

12 = 12,000 BTU/HR 

15 = 15,000 BTU/HR 

ELECTRICAL CODE 

4 = 208V-230V, 1 PHASE, 60 HZ 

5 = 265V, 1 PHASE, 60 HZ 

HEATER 

2 = 2.5 KW 

3 = 3.4 KW 

5 = 5.0 KW 

FEATURE CODE OPTIONS 

S = STANDARD ELECTROMECHANICAL 

R = REMOTE WALL-MOUNTED THERMOSTAT 

C = SEACOAST PROTECTION / STD. CONTROLS 

B = REMOTE THERMOSTAT / SEACOAST PROTECTION 

MANUFACTURING LOCATION 

P = PURCHASED PRODUCT 

YEAR OF INTRODUCTION 

M = 2003, P = 2004, R = 2005, S = 2006, T = 2007 

ENGINEERING CHANGE 

0, 1, 2, ETC. 

SERIAL NUMBER 

MANUFACTURING RESPONSIBILITY 

QR = FRIEDRICH MANUFACTURING CO. 

YEAR OF PRODUCTION 

P = 2003, R = 2004 

WEEK OF PRODUCTION 

5TH WEEK 

PRODUCT SEQUENCE NUMBER 

QR P 05 21234 

1-1

MODEL & SERIAL NUMBER LABEL & 

WIRING DIAGRAM LOCATIONS 

The Model/Serial Number label and Wiring Diagram locations are shown below. 

Wiring Diagram Location 

(Front Cover Removed) 

1-2 

Model & Serial 

Number Location

Whirlpool Model 

Control 

Type 

Cooling BTU 

230/208v 

SPECIFICATIONS 

ATE-SERIES PTAC W/ELECTRIC HEAT — COOLING PERFORMANCE 

Heating 

BTU 

Electric 

Volts Heater 

KW 

1-3 

Amps- NEMA Plug Dehum- 

EER CFM COP 

Breaker Plug Type* Pts/Hr 

ATE0743SPP Standard 7500/7000 11600 230 3.4 12.2 20 6-20 20 Amp 2.1 250 NA 



ATE1545SPP Standard 15000-15000 17000 230 5.0 9.5 30 6-30 30 Amp 5.5 350 NA 



ATE1555SPP Remote 15000/15000 17000 265 5.0 9.5 30 6-20 30 Amp 3.5 350 NA 

ATE0743RPP Remote 7500/75000 11600 230 3.4 12.2 20 6-20 20 Amp 2.1 250 NA 



ATE1545RPP Remote 15000-15000 17000 230 5.0 9.5 30 6-30 30 Amp 5.5 350 NA 

ATR-SERIES PTHP W/HEATING — COOLING PERFORMANCE 

Whirlpool Model 

Control 

Type 

Cooling BTU 

230/208v 

Heating 

BTU 

Electric 

Volts Heater 

KW 

Amps- NEMA Plug Dehum- 

EER CFM COP 

Breaker Plug Type* Pts/Hr 

ATR0743SPP Standard 7200/7000 11600 230 3.4 12.1 20 6-20 20 Amp 2.1 250 3.3 







ATR0743RPP Remote 7200/7200 11600 230 3.4 12.1 20 6-20 20 Amp 2.1 250 3.3 




* 15 Amps available on special order models 

CFM = Cubic Feet per Minute 

COP = Coefficient Of Performance (applies to PTHP only)

WHIRLPOOL PACKAGED TERMINAL 

AIR CONDITIONER (PTAC) AND PACKAGED 

TERMINAL HEAT PUMP (PTHP) WARRANTY 

LENGTH OF WARRANTY: 

ONE YEAR FULL WARRANTY 

FIVE YEAR FULL WARRANTY 

SECOND THROUGH FIFTH YEAR 

LIMITED WARRANTY 

WHIRLPOOL WILL NOT PAY FOR: 

WHIRLPOOL WILL PAY FOR: 

For one year from the date of installation, if this PTAC/PTHP fails 

when operated and maintained according to instructions attached 

to or furnished with the product, Whirlpool Corporation will pay for 

replacement parts and repair labor to correct defects in materials 

or workmanship. Service must be provided by a Whirlpool designated 

service company. 

For five years from the date of purchase, if this PTAC/PTHP fails 

when operated and maintained according to instructions attached 

to or furnished with the product, Whirlpool Corporation will pay for 

replacement parts and repair labor to correct defects in materials 

or workmanship in the sealed refrigeration system, including the 

compressor, evaporator, condenser, reversing valve and connecting 

tubing. Service must be provided by a Whirlpool designated 

service company. 

For the second through fifth year from the date of purchase, if this 

PTAC/PTHP fails when operated and maintained according to instructions 

attached to or furnished with the product, Whirlpool Corporation 

will pay for replacement parts to correct defects in materials 

or workmanship in the electrical or air flow systems including 

the fan motor, capacitor, fan, blower wheel, switches, thermostat, 

relays, frost controls, heat control, heater, heater protectors, compressor 

overload, solenoids, auxiliary controls, and transformer. 

This is a limited parts-only warranty and does not include labor or 

transportation to and from the service shop. Service must be provided 

by a Whirlpool designated service company. 

1. Service calls to correct the installation of the PTAC/PTHP, instruct you how to use the PTAC/PTHP, to replace 

fuses, correct wiring, reset circuit breakers, or to clean or replace owner accessible air filters. 

2. Damage resulting from accident, alteration, misuse, abuse, fire, floods, acts of God, improper installation not 

in accordance with local electrical and plumbing codes, or use of products not approved by Whirlpool 

Corporation, or Whirlpool Canada, Inc. 

3. Replacement parts or repair labor costs for units operated outside the United States or Canada. 

4. Pickup and delivery, or any transportation and reinstallation charges that may be required. 

5. The removal and reinstallation of the PTAC/PTHP. 

6. Repairs to parts or systems resulting from unauthorized modifications made to the PTAC/PTHP. 

WHIRLPOOL CORPORATION AND WHIRLPOOL CANADA, INC. SHALL NOT BE LIABLE FOR INCIDENTAL 

OR CONSEQUENTIAL DAMAGES. 

Some states and provinces do not allow the exclusion or limitation of incidental or consequential damages, so this 

exclusion or limitation may not apply to you. This warranty gives you specific legal rights and you may also have other 

rights which vary from state to state or province to province. 

Outside the United States and Canada, a different warranty may apply. For details, please contact your 

Whirlpool authorized dealer. 

If you need service, first see "Troubleshooting" section of the Installation/Operation Manual. After checking 

“Troubleshooting,” additional help can be found by checking the “Assistance or Service” section, or by calling the 

Whirlpool Corporation Customer Interaction Center at 1-800-253-1301 (toll-free), from anywhere in the United 

States. In Canada, please call 1-800-807-6777. 

1-4

INSTALLATION INFORMATION 

Electrical Shock Hazard 

Plug into a grounded 3 prong outlet. 

Do not remove ground prong. 

Do not use an adapter. 

Do not use an extension cord. 

Failure to follow these instructions can 

result in death, fire, or electrical shock. 

IMPORTANT: Connect PTAC/PTHP to a 

single-outlet circuit only. 

230/208 VOLT PTAC/PTHP 

All 230/208 volt PTAC/PTHPs are equipped 

with power cords. 

230/208 volt 250 volt Receptacles and 

PTAC/PTHP Overcurrent Protection 

AMPS 15 20 30 

RECEPTACLE 

NEMA Type 6-15R 6-20R 6-30R 

The field-supplied outlet must match plug on 

service cord and be within reach of service 

cord. 

ELECTRICAL REQUIREMENTS 

2-1 


Electrically ground PTAC/PTHP. 

Connect ground wire to green pigtail lead. 

Use copper wire for supply connection. 

Correct wire gauge is shown in the chart 

below. 


result in death or electrical shock. 

Rating Plate Ampacity AWG 

Less than 15 14 

16 - 20 12 

21 - 30 10 

265 VOLT PTAC/PTHP 

All 265 volt PTAC/PTHPs are equipped with 

pigtail leads for field wiring. 

IMPORTANT: 

• Use copper conductors only. 

• Wire sizes are per NEC. 

• Use on individual branch circuit only. 

• Use overcurrent protection indicated on 

PTAC/PTHP’s rating plate. 

• PTAC/PTHP must be grounded to branch 

circuit. 

• Check local codes.

LOCATION REQUIREMENTS 

• Unpack and dispose of packaging materials. 

• The drain kit accessory contains 10 complete 

drain kits. 

• Locate the drain kit in the primary area for 

best drainage. Maintain at least 1/2″ (1.27 

cm) distance from the embossed area. If the 

primary area cannot be used, locate the 

drain kit in the secondary area and cut away 

the foam insulation to allow access to the 

drain. Do not locate the drain kit within 3″ (7.6 

cm) of the indoor side of the sleeve. 

1 

2 

3 

1. Secondary area 

2. Primary area - no foam insulation 

3. If the drain must be located in the secondary area, 

the foam insulation must be cut away and removed 

to allow access to the drain. 

4. Embossed area 

DRAIN KIT INSTALLATION 

4 

3" 

(7.6 cm) 

2-2 

NOTES: 

Determine whether the drain will be located 

on the exterior of the wall, internally in the wall 

cavity or internally in the room. 

Internal Drain 

• Drain kit located inside the room will allow 

condensate to drain to a field drain located 

inside the room. 

• Drain kit located inside the wall cavity will 

allow condensate to drain to a field drain 

located inside the wall cavity. 

External Drain 

• Drain kit located outside will allow condensate 

to drain to a field drain located outside 

or to drain away from the wall sleeve. 

• When using an external drain system, select 

the drain hole on the back of the wall sleeve 

which best meets your drainage situation. 

• The cover plate and external drain tube 

assembly may be placed on either side of the 

wall sleeve.

INTERNAL DRAIN INSTALLATION 

(Located Inside The Wall Cavity Or 

In The Interior Of The Room) 

NOTE: If installing an internal drain, install drain 

kit on the wall sleeve before the wall sleeve is 

installed. 

1. Using the mounting plate from the drain kit 

as a template, mark and drill two 3/16″ 

mounting holes and a 1/2″ drain hole at the 

location chosen above. 

2. Remove the backing from the gasket and 

mount it on the flat side of the mounting 

plate. Insert the drain tube through the 

hole in the gasket and mounting plate so 

the tube flange will be against the wall 

sleeve. 

1 

2 

3 

4 

5 

6 

1. Screw 

2. Wall sleeve 

3. Gasket 

4. Mounting plate 

5. Nut 

6. Drain tube 

7. Optional 4 in. (10.2 cm) 

straight drain tube 

2-3 

3. Position the assembly beneath the drilled 

holes and secure it with #10 - 24 x 1/2″ 

machine screws and locknuts (provided). 

Seal the tops of the screws with silicone 

sealant. 

4. Connect the drain tube to the drain system 

in the building. 

IMPORTANT: Follow all local building 

codes when making this connection. 

5. Attach the 2 cover plates and gaskets over 

the drain holes at the rear of the wall 

sleeve with #10 sheet metal screws (provided). 

NOTE: Check that the 4 overflow slots at 

the rear of the wall sleeve are not blocked. 

1 

2 

1. Drain holes 

2. Overflow slots 

3. Gasket 

4. Cover plate 

5. #10 sheet metal screws 

1 

3 

4 

5

EXTERNAL DRAIN INSTALLATION 

(Located On The Exterior 

Of The Wall) 

1. Peel the backing tape from the gaskets 

and mount them on the curved side of one 

cover plate and one mounting plate. 

2. Place the drain tube through the gasket 

and the mounting plate with the flange 

toward the wall sleeve. 

3. Using 2 - #10 x 1/2″ sheet metal screws 

(provided), attach the drain tube assembly 

to one of the 2 drain holes at the rear of the 

wall sleeve. 

Position the large flange at the bottom of 

the sleeve facing toward the sleeve, and 

partially tighten the screws. Rotate the 

drain tube to a horizontal position to allow 

for the wall sleeve to be installed into the 

wall. Once the wall sleeve is installed, 

position the drain tube to the desired angle. 

Before tightening the screws, check to be 

sure the tube’s position will allow the wall 

sleeve to fit through the wall. Tighten screws. 

2-4 

1 

2 

3 

4 

1. Drain holes 

2. Overflow slots 

3. Foam gasket 

4. Mounting plate 

5. #10 x 1/2 in. sheet metal screws 

6. 1/2 in. O.D. tube 

7. Optional 4 in. (10.2 cm) straight drain tube 

8. Cover plate (no center hole) 

4. Using 2 - #10 x 1/2″ sheet metal screws 

(provided), attach the cover plate to the 

remaining drain hole. Check that the large 

flange on the plate is positioned at the 

bottom of the sleeve. 

NOTE: Check that the 4 overflow slots at 

the rear of the wall 

5. Discard any unused kit parts. 

1 

3 

8 

7 

6 

5

Excessive Weight Hazard 

Use two or more people to move and 

install PTAC/PTHP. 

Failure to do so can result in back or other 

injury. 

NOTES: 

• Check to be sure wall sleeve, wall sleeve 

extension (if used), wall sleeve adapter (if 

used), rear grille, and drain kit are properly 

installed before chassis installation. 

• Locate PTAC/PTHP near the location it will 

be installed. 

IMPORTANT: Copper refrigerant tubes are not 

handles. Product damage will occur if tubes 

are used to lift or move the chassis. 

CHASSIS INSTALLATION 

2-5 

1. Remove banding and carton. 

2. Remove the 2 chassis shipping brackets 

from the ends of the shipping pallet. 

1 

2 

3 

1. Compressor 

2. Chassis shipping bracket 

3. Shipping pallet 

3. Remove the front cover, which is contained 

in a protective plastic bag, from 

chassis. 

4. Dispose of all shipping and packaging material.

INSTALL THE CHASSIS 


Disconnect power before servicing. 

Replace all parts and panels before 

operating. 

Failure to do so can result in death or 

electrical shock. 

1. Disconnect power. 

2. Center the chassis in the installed sleeve 

and carefully push the chassis until the 

chassis flange and gasket contact the 

sleeve flange. 

1. Wall sleeve 

2. Chassis flange and gasket 

1 

2 

2-6 

3. Locate the 4 - #10 x 1″ chassis mounting 

screws (provided). Tighten the screws into 

the wall sleeve screw clips. 

1 

1. Chassis mounting screw 

2. Screw clips 

3. Chassis flange 

4. Install the front cover by placing the top of 

the front cover onto the metal flange at the 

top of the chassis. Rotate the front cover 

into place. Insert the thumbscrews (provided) 

into the slots located at the bottom 

back corners of the front cover. Tighten to 

secure the cover. 

NOTE: If the unit has been placed in such 

a way that there is no room to insert the 

thumbscrews from the bottom, a side 

mounting kit may be used. 

MAKE ELECTRICAL CONNECTIONS 

IMPORTANT: The installation of field wiring 

must conform to the requirements of the National 

Electrical Code, ANSI/NFPA NO. 70 (latest 

edition) in the United States, and any state 

laws and local ordinances (including plumbing 

or wastewater codes). In Canada, field wiring 

must conform to the Canadian electrical code 

PART I, CSA STANDARD C22.1-1993 or current 

edition. Local authorities having jurisdiction 

should be consulted before installation is 

made. Such applicable regulations or requirements 

take precedence over the general instructions 

in this Job Aid. 

2 

3

Cord Connected Models 


Plug into a grounded 3 prong outlet. 

Do not remove ground prong. 

Do not use an adapter. 

Do not use an extension cord. 


result in death, fire, or electrical shock. 

1. Plug into a grounded 3 prong outlet. 

2. Reconnect power. 

Direct Wired Models 




operating. 



Field wiring connections for direct-wired models 

can be done in one of 2 ways: 

• Using field-supplied conduit and wires. 

• Using the Conduit with Junction Box Kit 

accessory. 

2-7 

FIELD WIRING CONNECTIONS 

1. Disconnect power. 

2. Remove the PTAC/PTHP front cover using 

the thumbscrews. 

3. Route the incoming power supply through 

suitable conduit to the PTAC/PTHP control 

box. 

4. Remove the 4 screws holding the control 

box. 

1 

2 

1. Remove these screws. 

2. Do not remove these screws. 

3. Bushing 

5. Pivot the control box down, pull the chassis 

pigtail wires into the control box, and 

remove the bushing from the hole. The 

field-supplied wires will be routed through 

this hole. 

1. Bushing 

2. Control box 

1 

2 

3 

1 

2

6. Install field-supplied conduit into the same 

hole as the original bushing for the chassis 

pigtail wires on the control box. 

1. Field-supplied conduit 

2. Control box 

1 

2 

2-8 

7. Connect the chassis pigtail wires to the 

incoming power supply wires using the UL 

listed wire nuts (provided). Connect the 

black wire to the incoming L1 (black) wire. 

Connect the white wire to the incoming 

neutral (white) wire. Connect the green 

wire to the incoming ground (green or 

bare) wire. 

1. Black wire 

2. Incoming L1 wire (black wire) 

3. Green wire 

1 2 3 4 56 

4. Ground wire (green or bare wire) 

5. White wire 

6. Neutral wire (white wire) 

8. Reattach the PTAC/PTHP control panel 

using the 4 screws removed earlier. 

9. Reattach the PTAC/PTHP front cover using 

the thumbscrews removed earlier. 

10. Reconnect power.

REMOTE WALL THERMOSTAT INSTALLATION 

INSTALLATION REQUIREMENTS 

• Unpack and dispose of packaging materials. 

• This thermostat is a wall mounted, low-voltage 

thermostat that maintains room temperature 

by controlling the operation of the 

PTAC/PTHP. Batteries are not required— 

temperature and mode settings are preserved 

with the power off. 

• This is not a 2-stage heat pump thermostat 

with emergency heat selection. The PTAC/ 

PTHP turns on the electric heat automatically 

based on the outdoor coil temperature, 

which is influenced by the outdoor temperature 

and humidity conditions. 

• Chassis must be installed before installing 

remote thermostat. 

IMPORTANT: Improper wiring or installation 

may cause the thermostat not to function. Wiring 

must conform to local and national electrical 

codes. 

Wall Thermostat Terminal Designation 

Terminal Letter Operation Contact Made 

Y Cooling During call for 

cooling. 

W Heating During call for heating. 

G Fan Continuous if the 

slider is in the “Fan” 

position; otherwise, 

on call for cooling or 

heating. 

C (common) Common 

Terminal 

Constant 

R 24 V to the Constant (directly 

thermostat from the transformer) 

B (Heat Pump Reversing Made continuously 

units Only) Valve when the mode 

switch is in heating. 

2-9 

LOCATION REQUIREMENTS 

For best performance, thermostat should be 

mounted: 

• Approximately 5 ft (152.4 cm) from floor. 

• Close to or in the room with the PTAC/PTHP, 

preferably on an inside partitioning wall. 

• On a section of wall without pipes or duct 

work. 

For best performance, do not mount thermostat: 

• Close to a window, on an outside wall, or 

next to a door leading to the outside. 

• Exposed to direct light and heat from a lamp, 

the sun, a fireplace, or other heat source. 

This may cause a false reading. 

• Close to or in direct airflow from the PTAC/ 

PTHP. 

• In areas with poor air circulation (behind a 

door or in an alcove). 

INSTALL THE REMOTE WALL 

THERMOSTAT 

Replacing Existing Thermostat 

1. Disconnect power to avoid product damage 

during removal of existing thermostat. 

2. Disconnect wires from existing thermostat, 

one at a time. Do not allow wires to fall 

back into the wall. 

3. As each wire is disconnected, record wire 

color and terminal marking. 

4. Remove existing thermostat from wall. 

5. See “Installing The New Thermostat.” 

IMPORTANT: Mercury is a hazardous waste 

and must be disposed of properly. Contact the 

Thermostat Recycling Corporation at 

www.nema.org/trc for further information, or 

contact your local waste management authorities.

Installing The New Thermostat 

1. Disconnect power to avoid product damage 

during installation of new thermostat. 

2. Remove the PTAC/PTHP front cover. 

3. Locate the terminal strip on the front of the 

control box. 

CWY RG B 

Remote Remote Control Control Unit Unit 

4. Connect the field supplied 5 or 6 conductor, 

NEC Class 2, 24 volt thermostat wire 

to the terminals in accordance with the 

wiring diagram. 

1. Typical PTAC/PTHP unit 

2. Used for PTHP only 

3. Wall thermostat 

ON 

OFF 

1 

2 

3 

2-10 

5. Route the 24 volt thermostat wire alongside 

the conduit or service cord to the 

location chosen for the thermostat. 

6. Separate the front housing and back plate 

of the thermostat. 

1. Back plate 

2. Front housing 

7. Route thermostat wires through hole in 

back plate. Level back plate against wall 

(for aesthetic value only—thermostat need 

not be leveled for proper operation) and 

mark wall through any 2 of the 6 available 

mounting holes. 

8. Drill two 3/18″ mounting holes in wall where 

marked. 

Optional Mounting Method: Mounting holes 

on thermostat are designed to fit on a 

horizontally-mounted junction box. 

1.587 

2.625 

3.275 

2.375 

1 

2

9. Secure back plate to wall with 2 anchors 

and screws (provided) making sure all 

wires extend through hole in back plate. 

10. Connect wires to proper terminals of the 

thermostat connector block. 

1. Typical PTAC/PTHP unit 

2. Used for PTHP only 

3. Wall thermostat 

11. Push any excess wire back into wall. Excess 

wire inside the thermostat housing 

can interfere with proper airflow across 

the temperature sensor. Seal hole in wall 

to prevent air leaks. Air leaks can affect 

operation. 

12. Install thermostat housing on back plate. 

13. Reattach the PTAC/PTHP front cover. 

1 

2 

3 

2-11 

14. Reconnect power. 

NOTE: On power up, the LCD readout will display 

“oP” momentarily, and then the room temperature. 

1 

2 

3 

4 

5 

6 

0.8" 

(20.3 mm) 

4.55" 

(115.6 mm) 

1. Heat display 

2. Cool display 

3. Fan display 

4. Set display 

5. Mode button 

6. Fan button 

WHIRLPOOL DIGITAL 

THERMOSTAT OPERATION 

Error Messages 

3.30" 

(83.8 mm) 

E4 Internal memory failure. 

Replace thermostat. 

- - (two dashes) Cannot read room temperature. 

Replace 

thermostat. 

Random Restart Feature 

After a power outage, the Whirlpool digital thermostat 

will wait between 3 and 5 minutes before 

allowing the unit to restart. This is to keep 

multiple units from restarting at the same time 

when power is restored, thus preventing a circuit 

overload.

— NOTES — 

2-12

The refrigeration system uses the following 

four basic principles in its operation: 

1. Heat always flows from a warmer body to 

a cooler body. 

2. Heat must be added to or removed from a 

substance before a change in state can 

occur. 

3. Flow is always from a higher pressure 

area to a lower pressure area. 

4. The temperature at which a liquid or gas 

changes state is dependent upon the pressure. 

The refrigeration cycle begins at the compressor. 

Starting the compressor creates a low 

pressure in the suction line which draws refrigerant 

gas (vapor) into the compressor. The 

compressor then “compresses” this refrigerant, 

raising its pressure, and its temperature. 

PRODUCT OPERATION 

THEORY OF OPERATION 

Refrigeration Operation 

Suction Line 

3-1 

The refrigerant leaves the compressor through 

the discharge line as a hot, high pressure gas. 

The refrigerant enters the condenser coil where 

it gives up some of its heat. The condenser fan 

moves air across the finned surface of the 

condenser coil, and facilitates the transfer of 

heat from the refrigerant to the relatively cooler 

outdoor air. 

When a sufficient quantity of heat has been 

removed from the refrigerant gas, the refrigerant 

will “condense” (change to a liquid). Once 

the refrigerant has been condensed to a liquid, 

it is further cooled by the air flowing across the 

condenser coil. 

The Packaged Terminal Air Conditioner (PTAC) 

design determines at exactly what point (in the 

condenser) the change of state (gas to liquid) 

takes place. In all cases, however, the refrigerant 

must be totally evaporated (changed to a 

gas) before leaving the evaporator coil. 

Discharge Line 

Evaporator Coil Condenser Coil 

Compressor 

Capillary Tube 

(Metering) 

Refrigerant 

Strainer Filter/Drier 

Liquid Line

The refrigerant leaves the condenser coil as a 

warm high pressure liquid. It then passes 

through the filter/drier (if so equipped). It is the 

function of the filter/drier to trap any moisture, 

contaminants, and large particulate matter 

present in the sealed system. 

The liquid refrigerant next enters a metering 

device called a “capillary tube” whose purpose 

is to “meter” (control or measure) the quantity 

of refrigerant entering the evaporator coil. 

In the capillary tube, this is accomplished 

through its size and length, and the pressure 

difference present across the device. 

Since the evaporator coil is under a lower 

pressure than the liquid line, (due to the suction 

created by the compressor), the liquid refrigerant 

leaves the capillary tube, and enters the 

evaporator coil. 

As the liquid enters the evaporator coil, the 

larger area and lower pressure allows the 

refrigerant to expand, and lower its temperature. 

This expansion is often referred to as 

“boiling.” 

Suction Line 

3-2 

Since the blower is moving indoor air across 

the finned surface of the evaporator coil, the 

expanding refrigerant absorbs some of the 

heat. This results in a lowering of the indoor air 

temperature, hence the “cooling” effect. 

The expansion and absorption of heat causes 

the liquid refrigerant to evaporate, and change 

back to a gas. Once the refrigerant has been 

evaporated, it is further heated by the air that 

continues to flow across the evaporator coil. 

The particular system design determines at 

exactly what point the change of state, from a 

liquid to a gas, takes place in the evaporator. In 

all cases, however, the refrigerant must be 

totally evaporated (changed to a gas) before 

leaving the evaporator coil. 

The low pressure (suction) created by the 

compressor causes the refrigerant to leave the 

evaporator through the suction line as a cool, 

low pressure vapor. The refrigerant then returns 

to the compressor, where the cycle is 

repeated. 

Discharge Line 

Evaporator Coil Condenser Coil 

Compressor 

Capillary Tube 

(Metering) 

Refrigerant 

Strainer Filter/Drier 

Liquid Line

COOLING 

All air conditioners are basically heat pumps. 

They move, or “pump,” heat from inside a room 

to the outdoors. A heat pump air conditioner 

adds a component called a “reversing valve.” It 

HEATING 

INSIDE COIL 

REVERSING 

VALVE 

DISCHARGE 

LINE 

When the reversing valve is energized, the 

normal direction of refrigerant flow is diverted 

at the valve. The outdoor coil now becomes the 

low-pressure side of the system, and the inside 

INSIDE COIL 

Heat Pump Operation 

REVERSING 

VALVE 

DISCHARGE 

LINE 

COMPRESSOR 

COMPRESSOR 

3-3 

allows heat to be transferred from the outdoors 

into the room. When the reversing valve is not 

energized, the system operates in the cooling 

mode. 

ACCUMULATOR 

ACCUMULATOR 

SUCTION LINE 

SUCTION LINE 

OUTSIDE COIL 

coil becomes the high-pressure side. The flow 

of all refrigerant past the reversing valve 

changes direction, and now brings heat into the 

room from the outdoors. 

OUTSIDE COIL

PILOT VALVE SOLENOID 

DE-ENERGIZED (COOLING) 

The operation of the reversing valve is governed 

by the pilot solenoid coil. There are two 

small lines going to the pilot valve, and two 

lines going from the pilot valve to the main 

valve body. With the solenoid de-energized, 

the direction of flow is as shown, and the valve 

is in the cooling mode. 

PILOT VALVE SOLENOID 

ENERGIZED (HEATING) 

When the solenoid is energized, refrigerant 

flow from the suction and discharge lines is 

redirected (reversed) through the pilot valve to 

opposite ends of the main valve body. This 

reverse in flow (pressure) causes the main 

slide in the valve body to shift to the opposite 

end, and reverses the flow of the entire system. 

This reversed direction of refrigerant flow is 

maintained as long as the pilot solenoid is 

energized. 

Reversing Valve Operation 

TO EVAPORATOR 

TO EVAPORATOR 

3-4 

PILOT VALVE 

(SOLENOID DE-ENERGIZED) 

PILOT VALVE 

(SOLENOID ENERGIZED) 

DISCHARGE LINE 

DISCHARGE LINE 

SUCTION LINE 

TO CONDENSER 

SUCTION LINE 

TO CONDENSER

ROOM THERMOSTATS 

Room thermostats are controlled by the use of 

a remote thermostat that will cycle the air 

conditioner to maintain the desired room temperature. 

The fan speed switch controls the high and low 

fan speed operation. The switch is located on 

the control panel, and is independent of the 

thermostat. 

Room thermostats range from the simple bimetallic 

type, to the more complex electronic 

setback type. No matter how simple or complex, 

they are simply a switch (or series of 

switches) designed to turn equipment on or off 

under the desired conditions. 

An improperly operating, or poorly located room 

thermostat, can be the source of perceived 

equipment problems. A careful check of the 

thermostat and wiring must be made then to 

insure that it is not the source of problems. 

THERMOSTAT LOCATION 

Thermostats should not be mounted where 

they may be affected by drafts, discharge air 

from registers, (hot or cold), or heat radiated 

from the sun or appliances. 

The thermostat should be located about 5′ 

above the floor, in an area of average temperature, 

with good air circulation. Close proximity 

to the return air grille is the best choice. 

Mercury bulb type thermostats must be level to 

control temperature accurately to the desired 

set-point. 

Remote Thermostat Operation 

3-5 

HEAT ANTICIPATORS 

Heat anticipators are small resistance heaters 

that are built into most electromechanical thermostats 

(wired in series with the control “W” 

circuit). Their purpose is to prevent wide swings 

in room temperature during system operation 

in the “heating” mode. Since anticipators are 

wired in series, the “W” section of the circuit will 

open if one burns out, preventing the “heat” 

operation. 

The heat anticipator provides a small amount 

of heat to the thermostat causing it to turn off 

the heat source just prior to reaching the setpoint 

of the thermostat. This prevents exceeding 

the set point. 

To accomplish this, the heat output from the 

anticipator must be the same regardless of the 

current flowing through it. Consequently, some 

thermostats have an adjustment to compensate 

for varying current draw in the thermostat 

circuits. 

Electronic thermostats do not use a resistance-type 

anticipator. These thermostats use 

a microprocessor that determines a cycle rate 

based on a program loaded into it at the factory.

CALCULATING THE 

APPROXIMATE CFM 

The approximate CFM actually being delivered 

can be calculated by using the following formula: 

Kilowatts x 3413 

Temperature Rise x 1.08 

Do not use the kilowatt rating of the heater, as 

this will result in an incorrect airflow calculation. 

Kilowatts can be calculated by multiplying the 

measured voltage to the unit, times the measured 

current draw of all the heaters that are in 

operation to obtain the wattage (watts). Kilowatts 

are then obtained by dividing the watts by 

1000. 

3-6 

EXAMPLE: The measured voltage to the unit is 

230 volts. The measured current draw of the 

heaters is 11.0 amps. 

230 x 11.0 = 2530 

2530 ÷ 1000 = 2.53 Kilowatts 

2.53 x 3413 = 8635 

Supply Air 95°F 

Return Air 75°F 

Temperature Rise 20°F 

20 X 1.08 = 21.6 

8635 = 400 CFM 

21.6 

= CFM

THE HOT START SENSOR 

Under cold room conditions, (50°F, or below), 

the Hot Start Sensor turns on the heater strips 

with a call for heat to distribute warm air at the 

beginning of the “Heat” cycle. Once the return 

air has warmed sufficiently, (above 65°F), the 

heat pump mode will begin. 

THE HEAT PUMP 

The heat pump uses backup electric resistance 

heating coils. At extremely low outdoor 

ambient temperatures, the heat pump is automatically 

disabled, and the unit operates solely 

on electric resistance heat. 

The heating control (defrost thermostat) is located 

behind the decorative front cover, and is 

found on the right side panel of the chassis. Its 

function is to allow the temperature range in 

which the heat pump operates to be manually 

adjusted. 

The heating control switches the unit’s heat 

operation between the heat pump, and electric 

resistance heat, based on the outdoor ambient 

temperature. These change-over temperatures 

are based on the settings of the control. The 

factory set-point is at the one o’clock position. 

If you wish to change the factory set-point, 

insert a flat-bladed screwdriver into the slot and 

turn counterclockwise to increase the changeover 

set-point, or clockwise to decrease it. 

NOTE: Use the factory set-point for optimum 

performance. 

Heat Pump Function 

3-7 

Emergency Heat Operation Only: In the event 

of a compressor malfunction in the “heat pump” 

mode, turn the adjustment screw to the extreme 

counterclockwise “emergency heat” position. 

The heater will then cycle using electric 

resistance heat only. Note that in the emergency 

heat position, the compressor is locked 

out, disabling both the heat pump, and the 

cooling operations. IMPORTANT: Do not forget 

to return the control to its original position 

after repairs have been made. Otherwise, the 

compressor will remain locked out, and will not 

turn on during the “cooling” mode. 

Adjustment 

Screw

TEMPERATURE CONTROL 

The temperature control is a full range thermostat 

that maintains room temperature at the 

desired setting for both heating and cooling. 

Turn the knob counterclockwise for a warmer 

temperature, and clockwise for a cooler temperature. 

NOTE: Always rotate the temperature control 

in small increments in the warmer or cooler 

direction. Moving the control more than 1/4″ at 

a time may overcompensate, and result in an 

extreme hot or cold condition. 

MODE (SYSTEM) SWITCH 

Low and High Cool 

This setting operates the unit in the “cooling” 

mode. Cooling will not begin if the room temperature 

is below 60°F (15.5°C). 

Low and High Heat 

This setting operates the unit in the “heating” 

mode. 

Fan Only 

This setting operates the fan continuously at 

high fan speed to circulate air within the room. 

No heating or cooling functions are active in 

this mode. 

OPERATING THE CONTROLS 

3-8 

TEMPERATURE LIMITING 

THERMOSTAT 

The temperature limiting thermostat allows the 

temperature range of the thermostat to be 

varied. 

To adjust the temperature range: 

1. Turn the thermostat (temperature) control 

to the center position. 

2. Pull the two control knobs off the control 

shafts and remove them. 

3. Remove the four screws from the control 

panel and rotate the panel up. 

4. Note the location of the two temperature 

limiting screws and remove the screws 

from their present location. NOTE: The 

screws are factory installed for a temperature 

range of between 60 and 90°F (15.5 

to 32.2°C). 

5. To adjust the temperature range, reinstall 

the two screws at the desired hole locations. 

NOTE: Each hole represents an 

approximate change of 4°. To set a maximum 

temperature range of approximately 

64 to 86°F (17.7 to 30.0°C), install the two 

screws at the hole locations shown in the 

round illustration below. 

6. Lower the control panel and install the two 

screws, then reinstall the two control knobs.

FAN CYCLE SWITCH 

The fan cycle switch is located behind the 

decorative front cover and below the control 

box. The switch is designed to operate the fan 

either continuously, or intermittently with the 

compressor or heating elements. When the 

switch is in the CONTINUOUS position, the fan 

will run continuously when the unit is turned on. 

With the switch in the CYCLE position, the fan 

will run only when the compressor or heating 

elements cycle on. 

CONTINUOUS CYCLE 

FRESH AIR VENT CONTROL 

The fresh air vent control lever is located behind 

the front cover on the left side of the unit. 

The unit is shipped in the Closed position with 

a locking screw to prevent it from being moved. 

Remove the screw to operate the control. When 

the lever is back, the vent is open, and the 

outside air is mixed with indoor air. When the 

lever is forward, the vent is closed, and no 

outside air is admitted into the room. Only room 

air is recycled through the unit. 

Vent Closed 

Lever Forward 

Vent Open 

3-9 

REMOTE THERMOSTAT 

Remote thermostat units are controlled with a 

remote thermostat that is usually mounted on 

a wall. The thermostat will cycle the unit to 

maintain the desired room temperature (see 

page 3-5). 

The fan speed switch controls the high and low 

fan speed operation. The switch is located on 

the control panel, and is independent of the 

thermostat. 

Lever Back

— NOTES — 

3-10

This section instructs you on how to service each component inside the Packaged Terminal Air 

Conditioner. The components and their locations are shown below. 

Heater & Limit Switch 

COMPONENT ACCESS 

COMPONENT LOCATIONS 

Fan Motor 

Evaporator 

Hot Start Relay 

Capacitor 

Hot Start Sensor 

Fan Cycle Switch 

Not Shown: Condensate Valve Bellows 

Condenser 

Sensing Bulb & 

Heat Anticipator 

Control Chassis Components 

4-1 

Reversing Valve & Solenoid Coil 

(Heat Pump Models Only) 

Compressor & 

Overload Protector 

Defrost 

Thermostat 

Indoor 

Thermostat 

Mode 

(System) 

Switch 

Remote Control Unit 

Fan Switch

REMOVING THE INDOOR THERMOSTAT, 

MODE (SYSTEM) SWITCH, AND HEAT ANTICIPATOR 




operating. 



1. Unplug air conditioner or disconnect power. 

2. Remove the front cover from the unit (see 

page 2-11 for the procedure). 

3. Remove the four hex-head screws from 

the control panel and lift the panel off the 

unit. 

Screw Control Panel Screw 

Screw Screw 

Refer to the photos at the top of the right 

column. 

4. Pull the control knobs off the control shafts. 

5. If you are replacing the indoor thermostat, 

remove the two hex-head mounting 

screws, as shown in the round inset. 

4-2 


the control chassis. 

Indoor Thermostat 

Screws 

Control Chassis 

4 Control Chassis Screws 

7. Rotate the top of the chassis down so that 

you can access the components. 

Locking 

Tab 

Indoor 

Thermostat 

Control 

Chassis 

Mode 

Switch

8. To remove the mode switch: 

a) Raise the locking tab with a screwdriver 

blade, rotate the switch body to the 

right approximately 1/4-turn, and remove 

it from the chassis (see the round 

inset photo in step 7). 

b) Disconnect the wires from the switch 

terminals. NOTE: Disconnect the wires 

one at a time from the old switch, and 

install each of them to the identical 

terminals on the new one. This will help 

prevent miswiring. The switch wiring is 

shown below, and is also shown on the 

Wiring Diagram supplied with the unit. 

OR 

(Heat Ant) 

Ribbed 

(Power Cd) 

BK (Fan Cycle Sw) 

BK (Thermostat) 

RD (Rev. Valve) 

RD (Hot Start Sensor) 

BR RD Smooth BK RD 

(Jumper) (Cap) (Power) (Fan Mtr) (Fan Mtr) 

L1 H L 

6 

COM 

5 

7 

4 

L2 

BU (Temp Ctrl) 

2 

8 

Locking Tab 

9 

3 

1 

WH (Hot Start Relay) 

BU 

(Hot Start Relay) 

(Fan Cycle Sw) 

BU 

YL (Fan Cycle Sw) 

BU 

(Thermostat) 

RD 

(Thermostat) 

9. To remove the indoor thermostat: 

a) Disconnect the wires from the indoor 

thermostat terminals. NOTE: The wiring 

for the thermostat is shown to the 

right, and also on the Wiring Diagram 

supplied with the unit. 

b) Pull the sensing bulb & heat anticipator 

assembly off the front of the evaporator 

(see the photos to the right). 

c) Pull the sensing tube out of the holder 

and through the grommet in the control 

chassis, and remove the indoor thermostat. 

4-3 

10. To remove the heat anticipator: 

a) Disconnect the orange wires from the 

indoor thermostat and mode switch terminals. 

b) Push the strain relief out of the control 

chassis hole and remove it from the two 

orange wires. 

c) Pull the sensing bulb & heat anticipator 

assembly off the front of the evaporator. 

d) Pull the sensing tube out of the holder 

and remove the heat anticipator. 

Sensing Bulb 

Sensing Bulb & Heat 

Anticipator Holder 

BU (Mode Sw-Pin 3) BK (Mode Sw-Pin 2) 

L3 C2 

H1 

OR (Heat Anticipator) 

Heat Anticipator 

Grommet 

BK (Rev. Valve) 

RD (Mode Sw-Pin 1) 

Strain Relief

REMOVING THE POWER SUPPLY CORD 




operating. 






3. Lower the control chassis to access the 

components (see page 4-2 for the procedure). 

4. Disconnect the ribbed power supply cord 

lead from mode switch terminal L2, and 

the smooth lead from terminal L1 of the 

mode switch. 

5. Remove the machine screw from one end 

of the green ground wire at the control 

chassis, and the screw at the other end of 

the green wire at the chassis location near 

the capacitor. 

6. Push the power cord strain relief out of the 

control chassis mounting hole, and remove 

the power supply cord. 

4-4 

Power Cord 

Leads (L1 & L2) 

Ground 

Screw 

Strain Relief 

Ground Screw 


Connect green ground wire to ground 

screws. 



NOTE: Be sure to reinstall the power supply 

cord leads to the mode switch terminals L1 

(smooth) and L2 (ribbed), and the ends of the 

green ground wire to the chassis locations with 

their machine screws. Also, be sure to reinstall 

the strain relief on the power supply cord.

REMOVING THE DEFROST THERMOSTAT 




operating. 








Red Wire 

Black Wire 

2 Brown Wires 

4-5 

4. Disconnect the wires from the defrost thermostat 

terminals. 

5. Remove the two hex-head screws from 

the defrost thermostat. 

6. Remove the outdoor grille from the rear of 

the unit. 

7. Pull the sensing tube out of the condenser 

and push the tube into the front of the unit 

as far as possible. 

Sensing Tube 

Rear Of Unit 

8. Pull the sensing tube inside and remove 


Defrost 

Thermostat 

Screws 

Defrost Sensing Tube 

Defrost Thermostat

REMOVING THE HOT START RELAY 

AND HOT START SENSOR 




operating. 








Hot Start Sensor 

Hot Start Relay 

4-6 

4. To remove the hot start relay: 

a) Disconnect the wires from the relay 


b) Remove the two hex-head screws from 

the relay and remove it. 

BR-Defrost 

Thermostat 

BU 

BK 

WH 

RD 

BR-Hot 

Start 

Sensor 

5. To remove the hot start sensor: 

a) Disconnect the wires from the sensor 


2 RD 

BR 

b) Remove the two hex-head screws from 

the sensor and remove it. 

Screw 

Screw 

Hot Start Sensor

REMOVING THE CAPACITOR & FAN CYCLE SWITCH 




operating. 








Capacitor 

Fan Cycle Switch 

4. To remove the capacitor: 

a) Disconnect the wires from the terminals 

(see the illustrration at the top of 

the right column). 

b) Loosen the two hex-head screws from 

the capacitor clamp and remove the 

capacitor from the clamp. 

4-7 

BU 

(White Ring) 

Clamp 

Screw 

5. To remove the fan cycle switch: 

a) Disconnect the wires from the switch 


b) Press in on the locking arms and push 

the switch out of the control chassis 

cutout. 

REASSEMBLY NOTE: Make sure that you 

position the fan cycle switch with the pin 1 

terminal to the left as shown before you reinstall 

it in the chassis cutout. 

Pin 1 

BU 

Locking Arms 

YL 

BR 

(Green Ring) 

2 RD & YL 

(Black Ring) 

VT & BK 

Clamp 

Screw

REMOVING THE REMOTE CONTROL UNIT FAN SWITCH 




operating. 







the remote control panel. 

Remote 

Screw Control Panel Screw 

Screw Screw 

4-8 

4. Lift the remote control panel off the unit, 

and turn it over. 

5. Disconnect the wires from the fan switch 


6. Press in on the locking arms and push the 

switch out of the control panel cutout. 

Pin 1 

BK 

BU 

RD 

REASSEMBLY NOTE: Make sure that you 

position the fan switch with the pin 1 terminal 

positioned as shown before you reinstall it in 

the control panel cutout.

REMOVING THE HEATER & LIMIT SWITCH 




operating. 






3. Remove the three hex-head screws from 

the screen and remove the screen. 

3 Screws 

Screen 


the air deflector and remove the deflector. 

Screw Screw 

Air Deflector 

4-9 


the deck, then lift the left end of the deck, 

pull the right end tabs out of their slots, and 

remove the deck. 

4 Screws 

Deck 

6. Lift the heater out of the unit and disconnect 

the two wires from the terminals. 

7. To remove the limit switch from the heater, 

remove the three screws. 

Heater 

Heater 

Screw 

Limit Switch 

Screw 

Screw 

Wires




operating. 




2. Remove the unit from the wall sleeve (see 

pages 2-10 and 2-11 for the procedure). 

3. Remove the heater and limit switch from 

the unit (see page 4-9 for the procedure). 

4. Lower the control chassis so you can 

access the fan motor wires (perform steps 

3, 6, and 7 on page 4-2). 

5. Disconnect the black and red fan motor 

wires from mode switch terminals H and L. 

REMOVING THE FAN MOTOR 

Mode 

Switch 

4-10 

6. Disconnect the brown and yellow fan motor 

wires from the capacitor terminals. 

L1 H L 

6 

COM 

5 

7 

4 

L2 

BK 

(Fan Mtr) 

2 

8 

RD 

(Fan Mtr) 

9 

3 

1 

BR Fan Mtr 

(Green Ring) 

YL Fan Mtr 

(Black Ring) 

7. Pull the ends of the four fan motor wires 

through the chassis hole and remove them 

from the plastic wire clamp. 

Wire Clamp 

Chassis Hole

8. Using a 5/32″ allen wrench, loosen the 

collar and clamp screws on the condenser 

and evaporator fans. 

Collar Screw 

Evaporator 

Fan 

Clamp Screw 

Condenser 

Fan 


the bottom of the fan motor brackets (2 on 

each bracket). 

Fan Motor Bracket Screw (1 of 4) 

4-11 


each of the condenser fan shroud mounting 

brackets and remove the brackets. 

11. Remove the remaining three hex-head 

screws from the condenser shroud (1 bottom 

and 2 side screws). 

Condenser 

Fan Shroud 

Brackets & 

Screws (2 each) 

12. From the rear of the unit, pull the defrost 

sensing tube out of the condenser and 

from behind the bracket, and move it out of 

the way. 

13. Remove the two hex-head condenser 

mounting screws from the chassis pan. 

Bracket 

Side Screw (1 of 2) 

Sensor Tube 

Condenser 

Bottom Screw 

Screw Screw 

Continued on the next page.

14. Grasp the bottom of the condenser under 

the two end brackets, and carefully lift the 

assembly until the bottom of each bracket 

is positioned over the top edge of the 

chassis pan. Carefully pull the condenser 

back just far enough to clear the fan motor 

assembly when it is removed. 

Position Condenser Brackets 

Over Top Edge Of Chassis Pan 

15. Pull the evaporator fan off the front shaft of 

the fan motor. 

NOTE: When you perform the following step, 

be careful not to damage the thin metal vanes 

of the condenser. 

16. Lift the fan motor assembly and condenser 

fan shroud, and pull the front motor shaft 

out of the opening in the frame, then 

remove the assembly from the unit. 

17. Pull the condenser fan shroud and condenser 

fan off the motor. 

4-12 

18. Remove the three 3/8″ hex-head screws 

from the fan motor bracket and remove the 

motor from the bracket. 

Fan Motor 

Screw (1 or 3) 

Bracket 

REASSEMBLY NOTES: 

• When reinstalling the condenser fan, position 

the front edge of the blade so it is even 

with the front edge of the shroud. 

Keep Blade Edge Even 

With Edge Of Shroud 

• When reinstalling the evaporator fan, make 

sure that the front edge of the collar is even 

with the front end of the motor shaft. 

Keep Even

REMOVING THE CONDENSATE VALVE BELLOWS 




operating. 








brackets and remove the brackets. 




Condenser 

Fan Shroud 

Shroud Brackets & 



Bottom Screw 

4-13 

5. Tilt the top of the condenser fan shroud 

forward and pull the left end away from the 

condenser just far enough to access the 

condensate valve bellows. 

Left Side View 

Condenser Fan Shroud 

Remove Nut Loosen Nut 

Condensate Valve Bellows 

(Front View) 

6. Remove the left 5/16″ nylon mounting nut 

on the condensate valve bellows, and 

loosen the right nut approximately half 

way on the chassis pan stud.

REMOVING THE OVERLOAD PROTECTOR 

AND THE COMPRESSOR 




operating. 






3. To remove the overload protector: 

a) Remove the hex cap nut and the nylon 

flat washer from the terminal cover and 

remove the cover. 

Hex Cap Nut 

& Nylon Flat 

Washer 

Terminal 

Cover 

4-14 

b) Disconnect the black wire from the compressor 

terminal, and the black wire 

from the overload protector terminal. 

Compressor 

Terminals 

Black 

Wires 

Overload 

Protector 

REASSEMBLY NOTE: When you reinstall the 

terminal cover on the compressor, make sure 

that the overload protector is centered in the 

gasket hole, and does not sit on any portion of 

the gasket. 

4. To remove the compressor: 

a) Remove the overload protector (see 

step 3). 

b) Disconnect the blue wire from the S (V) 

terminal and the red wire from the R (U) 

terminal of the compressor. 

c) Remove the gasket. 

Red 

Wire 

Blue 

Wire 

Gasket

d) Braze on an access valve and discharge 

the sealed system refrigerant 

into an approved recovery system. 

e) Disconnect the high side line from the 

compressor, and the suction line from 

the accumulator. 

High Side Line 

To Compressor 

Suction Line 

To Accumulator 

f) Remove the three 1/2″ hex bolts from 

the compressor’s rubber shock mounts. 

1/2″ Hex Bolt 

4-15 

g) Lift the compressor from the unit and 

remove the three rubber shock mounts. 

Rubber Shock 

Mount (1 of 3)




operating. 



REMOVING THE EVAPORATOR 




3. Braze on an access valve and discharge 

the sealed system refrigerant into an approved 

recovery system. 

4. Remove the screen, air deflector, and 

deck from the front of the unit (see steps 3, 

4, and 5 on page 4-9). 

Deck 

Air Deflector 

Screen 

Evaporator 

Mounting Plate 

4-16 


the control chassis, and rotate the chassis 

down. 

4 Control Chassis Screws 


the evaporator mounting plate, located on 

the right side of the chassis. 

Screws

7. Pull the indoor thermostat sensing bulb 

and heat anticipator off the evaporator 

and position it out of the way. 

Sensing Bulb & Heat 

Anticipator Holder 

8. Remove the six front evaporator mounting 

screws (two from the chassis flange, two 

from the mounting plate, and two from the 

chassis pan). Remove the mounting plate 

from the unit. 

Chassis Flange Screws 

Chassis Pan Screws 

Mounting Plate Screws 

4-17 

9. Lift the evaporator just enough to position 

it away from the styrofoam holder, and 

install heat insulation below it. 

10. Unbraze the tubing joints at the top and 

bottom of the evaporator. 

Unbraze Tubing Joints 

Unbraze Tubing Joint 

11. After the evaporator cools, remove it from 

the unit.




operating. 











brackets and remove the brackets 

(see the photo at the top of the right 

column). 




6. Tilt the top of the condenser fan shroud 

forward and pull it away from the condenser 

just far enough to protect it from 

the brazing heat. 

REMOVING THE CONDENSER 

4-18 

Condenser 

Fan Shroud 

Shroud Brackets & 



Bottom Screw 

7. Pull the defrost thermostat sensing bulb 

from the condenser and move it out of the 

way. 

8. Remove the two condenser hex-head 

screws from the chassis pan. 

Sensing Bulb 

Condenser 

Chassis Pan Screws

9. Grasp the bottom of the condenser under 

the two end brackets, and carefully lift the 

assembly until the bottom of each bracket 

is positioned over the top edge of the 

chassis pan. Carefully pull the condenser 

back just far enough to clear the fan motor 

assembly when it is removed. 

10. Unbraze the three tubing joints (two at the 

top and one at the bottom) and remove 

them from the condenser. 

11. Remove the condenser from the unit. 

4-19 

Unbraze Tubing Joints 

Unbraze 

Tubing Joint 

Position Condenser Brackets 

Over Top Edge Of Chassis Pan

REMOVING THE SOLENOID COIL & REVERSING VALVE 




operating. 









Reversing Valve & Solenoid Coil 

4. To remove the solenoid coil (see the 

photo at the top of the right column): 

a) Disconnect the two wire connectors 

from the coil terminals. 

b) Remove the hex-head screw. 

c) Slide the coil off the valve. 

4-20 

Coil Wires 

Solenoid Coil 

Screw 

5. To remove the reversing valve and solenoid: 

a) Remove the solenoid coil (see step 4). 

b) Unbraze the four tubing joints from the 

reversing valve. 

c) Apply thermal heat trap material around 

the new solenoid and valve to protect 

them. 

4 Tubing Joints 

Solenoid 

Reversing Valve

Before testing any of the components, perform 

the following checks: 

• Control failure can be the result of corrosion 

on connectors. Therefore, disconnecting and 

reconnecting wires will be necessary throughout 

test procedures. 

• All tests/checks should be made with a VOM 

or DVM having a sensitivity of 20,000 ohmsper-volt 

DC, or greater. 




operating. 



INDOOR THERMOSTAT 

COMPONENT TESTING 

1 

3 

2 

5-1 

• Check all connections before replacing components, 

looking for broken or loose wires, 

failed terminals, or wires not pressed into 

connectors far enough. 

• Resistance checks must be made with power 

cord unplugged from outlet, and with wiring 

harness or connectors disconnected. 

Refer to page 4-2 for the procedure for servicing 

the indoor thermostat. 

NOTE: The temperature should be above 60°F 

(15.5°C) to determine the following readings. 


2. Disconnect the wires from the thermostat 


3. Set the ohmmeter to the R x 1 scale. 

4. Clip the black (–) ohmmeter test lead to 

terminal 2 (common) and leave it there. 

5. Rotate the temperature control fully counterclockwise 

(Warmer). 

6. Touch the positive (+) ohmmeter test lead 

to terminal 1. The meter should indicate a 

closed (0 Ω) circuit. 


to terminal 3 (L3). The meter should indicate 

an open (infinite) circuit. 

8. Rotate the temperature control fully clockwise 

(Cooler). 


to terminal 1. The meter should indicate an 

open (infinite) circuit. 



a closed (0 Ω) circuit.



Replace all parts and panels before operating. 

Failure to do so can result in death or electrical shock. 

MODE (SYSTEM) SWITCH HEAT ANTICIPATOR 


the mode (system) switch. 


2. Disconnect the wires from the mode switch 



4. To check the switch contact operation, 

touch the ohmmeter test leads to the switch 

terminals shown in the following charts: 

SWITCH CONTINUITY 

SWITCH POSITION CONTACTS MADE 

OFF NONE 

LOW COOL 

HIGH COOL 

L1 - 2 

5 - 3 

4 - 6 

L - 9 

COM - L2 

L1 - 2 

5 - 3 

4 - 6 

H - 9 

COM - L2 

SWITCH CONTINUITY 

SWITCH POSITION CONTACTS MADE 

OFF NONE 

8 - H 

FAN ONLY 

COM - L2 

L1 - 8 

HIGH HEAT 

LOW HEAT 

5-2 


the heat anticipator. 


2. Disconnect the heat anticipator wires from 

the mode switch terminals. 

3. Set the ohmmeter to the R x 10K scale. 

4. Touch the ohmmeter test leads to the 

ends of the orange heat anticipator wires. 

The meter should indicate approximately 

56 K Ω . 

L1 - 2 

5 - 1 

7 - 6 

H - 9 

COM - L2 

L1 - 2 

5 - 1 

7 - 6 

L - 9 

COM - L2





DEFROST THERMOSTAT 

(EMERGENCY HEAT SWITCH) 



NOTE: Continuity will be read between terminals 

2 and 3, providing the temperature of the 

capillary tube is above 25°F (–4°C). If the 

temperature at the capillary tube is above 52°F 

(11°C), it may be necessary to place the end of 

the capillary tube in ice water to determine if the 

control is sensing temperature changes. 

5-3 


2. Disconnect the wires from the thermostat 


3. Turn the screwdriver control to the fully 

counterclockwise (emergency heat) position. 


5. Clip the black (–) ohmmeter test lead to 

terminal 2 (C2) and leave it there. 


to terminal 1 (H1). The meter should indicate 

a closed (0 Ω) circuit. 



an open (infinite) circuit. 

8. Rotate the screwdriver control clockwise. 

When the control reaches its setpoint, the 

meter should indicate a closed (0 Ω) circuit.





HOT START RELAY HOT START SENSOR 

3 

COIL 

1 4 


the hot start relay. 


2. Disconnect the wires from the relay terminals. 



following relay terminals: 

1 to 3 = open (infinite) circuit 

4 to 5 = closed (0 Ω) circuit 


6. Touch the ohmmeter test leads to the coil 

(unmarked) terminals. The meter should 

indicate between 1480 and 1520 Ω. 

5 

5-4 

Closed Below 50°F 

Open above 65°F 


the hot start sensor. 


2. Disconnect the wires from the sensor terminals. 



sensor terminals. The meter should indicate 

an open (infinite) circuit at room temperatures 

above 65°F.

CAPACITOR 






the capacitor. 


2. Disconnect the wires from the capacitor 


3. Set the ohmmeter to the R x 1K scale. 

4. Touch one of the ohmmeter test leads to 

the common (C) terminal and the other 

test lead to the FAN and HERM terminals. 

5. The meter should indicate several ohms 

and gradually return to infinity at both the 

FAN & HERM terminals. 

5-5 

FAN CYCLE SWITCH & REMOTE 

CONTROL UNIT FAN SWITCH 


the fan cycle switch, and page 4-8 for the 

remote control unit fan switch. 


2. Disconnect the wires from the switch terminals. 


4. Clip one of the ohmmeter test leads to the 

center (common) terminal and leave it 

there. 

5. Touch the ohmmeter test leads to pins 1 

and 3. Depending on the position of the 

rocker pushbutton, the meter should indicate 

an open (infinite) circuit at one pin, 

and a closed (0 Ω) circuit at the other pin. 

6. Press the rocker pushbutton to the other 

switch position, and repeat step 5. The 

meter readings should be reversed.





HEATER & LIMIT SWITCH (N.C.) 

Limit Switch 

Heater 


the heater and limit switch. 


2. Disconnect the heater wire from the hot 

start sensor terminal. 


4. To test the heater, touch the ohmmeter 

test leads to the heater wire connectors. 

The meter should indicate between 11 

and 17 Ω. 

5. To test the limit switch, touch the ohmmeter 

test leads to the terminals. The 

meter should indicate a closed circuit at 

room temperature. 

5-6 

FAN MOTOR 


the fan motor. 




following motor wire connectors. Disconnect 

one of the wires before you make the 

measurement: 

Black to red = 100 to 110 Ω 

Yellow to brown = 180 to 200 Ω





OVERLOAD PROTECTOR 


the overload protector. 


2. Disconnect the overload protector wires. 



overload protector terminal and connector. 

5. The meter should indicate continuity (0 Ω). 

5-7 

COMPRESSOR 

Compressor 

Terminals 

Blue 

R 

(U) 

C 

(W) 

Black 

S 

(V) 

Red 


the compressor. 


2. Disconnect the three wires from the compressor 



4. Clip an ohmmeter test lead to the overload 

protector terminal C (W). 

5. Touch the free test lead to the following 

compressor terminals. The meter should 

indicate as shown: 

Terminal R (U) = 0.5 Ω 

Terminal S (V) = 3.16 Ω 

Terminal S (V) to R (U) = 3.65 Ω

SOLENOID COIL 






the solenoid coil. 

5-8 


2. Disconnect one of the wires from the solenoid 

coil terminals. 



solenoid coil terminals. The meter should 

indicate between 1480 and 1520 Ω.

DIAGNOSIS & TROUBLESHOOTING 

REFRIGERANT CHARGING 

DIAGNOSING THE SEALED SYSTEM 

The proper refrigerant charge is essential to 

proper sealed system operation. Operating the 

unit with an improper refrigerant charge will 

result in reduced performance and efficiency. 

The use of proper charging methods during 

servicing will insure that the unit is functioning 

as designed, and that its compressor will not be 

damaged. 

Too much (overcharged) or too little (undercharged) 

refrigerant in the system can be the 

source of compressor failure if uncorrected for 

any period of time. 

An overcharged system will sometimes return 

liquid refrigerant back to the suction side of the 

compressor, and eventually cause a mechanical 

failure within the compressor. This mechanical 

failure can manifest itself as valve 

failure, bearing failure, or some other mechanical 

failure. The specific type of failure will be 

influenced by the amount of liquid being returned 

to the suction line, and the length of time 

that it continues. 

An undercharged system will cause the temperature 

of the suction gas to increase to the 

point where it does not provide sufficient cooling 

for the compressor motor. When this occurs, 

the motor winding temperature will increase, 

causing the motor to overheat, and 

open the compressor’s overload protector. Continued 

overheating of the motor windings and 

cycling of the overload, will eventually lead to 

compressor motor, or overload failure. 

6-1 

METHOD OF CHARGING 

The preferred and most accurate method for 

charging the PTAC system is called the 

“Weighed in Charge Method,” and is applicable 

to all units. This method should always 

be used whenever a charge is removed from a 

unit for a leak repair, compressor replacement, 

or when there is no refrigerant charge left in the 

unit. 

To use this method, perform the following 

steps: 

1. Install a piercing valve to remove refrigerant 

from the sealed system. NOTE: The 

piercing valve must be removed from the 

system before recharging. 

2. Recover the refrigerant in accordance with 

EPA regulations. 

3. Install a process tube to the sealed system. 

4. Make the necessary repairs to the system. 

5. Evacuate the system to 300 microns or 

less. 

6. Weigh in the refrigerant with the proper 

quantity of R-22 refrigerant. 

7. Start the unit, and verify its performance. 

8. Crimp the process tube closed, and solder 

the end shut.

AN UNDERCHARGED SYSTEM 

An undercharged system will result in poor 

performance (low pressures) in both the heating 

and cooling cycle. 

Whenever you service a unit with an undercharge 

of refrigerant, you can usually suspect 

a leak. The leak must be repaired before charging 

the unit. 

To check for an undercharged system, turn the 

unit on, and allow the compressor to run long 

enough (15 to 20 minutes) to establish working 

pressures in the system. 

Undercharged System 

6-2 

During the cooling cycle, listen carefully at the 

exit of the capillary tube into the evaporator. An 

undercharged system will cause an intermittent 

“hissing” and “gurgling” sound. Intermittent 

frosting and thawing of the evaporator is 

another indication of a low charge. However, 

frosting and thawing can also be caused by 

insufficient air over the evaporator. 

Check for an undercharged system at the 

compressor. If the compressor seems quieter 

than normal, it is an indication of a low refrigerant 

charge. A check of the amperage drawn by 

the compressor motor should show a lower 

reading (check the unit’s specifications). 

After the unit has run 10 to 15 minutes, check 

the gauge pressures. 

Gauges connected to an undercharged system 

will have low head pressures, and substantially 

low suction pressures.

AN OVERCHARGED SYSTEM 

To help confirm an overcharged system, remove 

some of the charge. If conditions improve, 

the system is most likely overcharged. If 

conditions do not improve, non-condensables 

(air) are indicated. 

Whenever an overcharged system is indicated, 

always make sure that there are no airflow 

problems. Improper airflow over the evaporator 

coil may indicate some of the same symptoms 

as with an overcharged system. 

Overcharged System 

6-3 

An overcharge can cause the compressor to 

fail, since liquid refrigerant is entering the suction 

line. 

The charge for any system is critical. When the 

compressor is noisy, and you are sure that 

there is sufficient airflow over the evaporator 

coils, suspect an overcharge. Icing of the evaporator 

will not be encountered, because the 

refrigerant will boil later, if at all. Gauges connected 

to the system will usually have a higher 

head pressure (depending upon amount of 

overcharge). Suction pressure should be slightly 

higher.

A RESTRICTED SYSTEM 

The following procedures are the more common 

problems and solutions to the problems of 

a restricted sealed system. There are two 

types of refrigerant restrictions: 

• Partial restrictions 

• Complete restrictions 

With a partial restriction, some of the refrigerant 

will circulate through the system. 

With a complete restriction there is no circulation 

of refrigerant in the system. 

Restricted refrigerant systems will display the 

same symptoms as a “low-charge condition.” 

When the unit is turned off, the gauges may 

equalize very slowly. 

Partially Restricted System 

6-4 

When gauges are connected to a completely 

restricted system, the gauges will run in a deep 

vacuum. When the unit is turned off, the gauges 

will not equalize at all. 

A quick check for either condition begins at the 

evaporator. With a partial restriction, there may 

be a “gurgling” sound at the capillary tube 

entrance to the evaporator. The evaporator in 

a partial restriction could be partially frosted, or 

have an ice ball close to the entrance of the 

capillary tube. Frost may continue on the suction 

line back to the compressor. 

Often a partial restriction of any type can be 

found by feeling for a temperature difference 

from one side of the restriction to the other.

With a complete restriction, there will be no 

sound at the capillary tube entrance. An amperage 

check of the compressor with a partial 

restriction may show normal current when compared 

to the unit specification. The current 

drawn may be considerably less than normal, 

since the compressor is running in a deep 

vacuum (no load). Much of the area of the 

condenser will be relatively cool, since most, or 

all of the liquid refrigerant will be stored there. 

Completely Restricted System 

6-5 

CAPILLARY TUBE RESTRICTIONS 

All Whirlpool PTAC units are equipped with 

capillary tubes. When checking for a restricted 

capillary tube, use the following procedure. 

1. Connect pressure gauges to the unit. 

2. Start the unit in the “cooling” mode. If the 

pressures are normal after a few minutes of 

operation, the check valve and cooling capillary 

are not restricted. 

3. Switch the unit to the “heating” mode, and 

observe the gauge readings after a few 

minutes of running time. If the system pressure 

is lower than normal, the heating capillary 

is restricted. 

4. If the operating pressures are lower than 

normal in both the heating and cooling 

modes, the cooling capillary is restricted.

THE REVERSING VALVE 

The reversing valve controls the direction of 

refrigerant flow to the indoor and outdoor coils. 

The valve consists of a pressure-operated 

main valve, and a pilot valve that is actuated by 

a solenoid plunger. The solenoid is energized 

during the “heating” cycle only. The reversing 

valve used in the PTAC system is a 2-position, 

4-way valve. 

The single tube on one side of the main valve 

body is the high-pressure inlet to the valve from 

the compressor. The center tube on the opposite 

side is connected to the low pressure 

(suction) side of the system. The other two 

tubes are connected to the evaporator and 

condenser. 

Left Tube To Evaporator Line 

Center Tube 

Low Pressure 

Suction Line 

High Pressure Inlet Line 

Reversing Valve 

Right Tube 

To Condenser 

Solenoid Coil 

6-6 

Small capillary tubes connect each end of the 

main valve cylinder to the “A” and “B” ports of 

the pilot valve. A third capillary is a common 

return line from these ports to the suction tube 

on the main valve body. Four-way reversing 

valves also have a capillary tube from the 

compressor discharge tube to the pilot valve. 

The piston assembly in the main valve can only 

be shifted by the pressure differential between 

the high and low sides of the system. The pilot 

section of the valve opens and closes ports for 

the small capillary tubes to the main valve, to 

cause it to shift. 

NOTE: The sealed system operating pressures 

must be near normal before the valve 

can shift.

TROUBLESHOOTING CHARTS 

Refrigerant System—Cooling 

Low Suction Pressure High Suction Pressure Low Head Pressure High Head Pressure 

Low Load Conditions High Load Conditions Low Load Conditions High Load Conditions 

Low Airflow Across 

Evaporator 

Refrigerant System 

Restriction 


High Airflow Across 

Evaporator 


Not Fully Seated 


Refrigerant System—Heating 

6-7 


Restriction 




Moisture In System Defective Compressor Defective Compressor 


Condenser 


Non-Condensables 

(Air) In System 

Low Suction Pressure High Suction Pressure Low Head Pressure High Head Pressure 


Condenser 


Restriction 


Outdoor Ambient 

Temperature Too High 




Restriction 



Outdoor Ambient 

Temperature Too High 

For Operation In Heating 

Overcharged System Undercharged System Overcharged System 

Moisture In System Defective Compressor Defective Compressor 


Evaporator 

Non-Condensables 

(Air) In System

Electrical Troubleshooting—Heat Pump 

Is Line Voltage Present 

At Solenoid Valve? 

YES 

Is Solenoid Coil Good? 

YES 

Reversing Valve Stuck 

Replace Reversing Valve 

NO 

NO 

System Cools When 

Heating Is Desired 

6-8 

Is Selector Switch 

Set For Heat? 

Replace Solenoid Coil

WIRING DIAGRAMS & STRIP CIRCUITS 

Due to the large number of models for the 

Packaged Terminal Air Conditioners, the Wiring 

Diagrams and Strip Circuits will be broken 

down as follows: 

• The charts on this page show the model 

numbers, the associated wiring diagram 

numbers, and the pages on which the 

diagrams are located (parentheses). 

Model # 

Wiring Diagram # 

And (Page #) 

ATE0743BPP 5 (7-7) 

ATE0743CPP 1 (7-5) 

ATE0743RPP 5 (7-7) 

ATE0743SPP 1 (7-5) 

ATE0753BPP 7 (7-8) 

ATE0753CPP 3 (7-6) 

ATE0753RPP 7 (7-8) 

ATE0753SPP 3 (7-6) 

ATE0943BPP 5 (7-7) 

ATE0943CPP 1 (7-5) 

ATE0943RPP 5 (7-7) 

ATE0943SPP 1 (7-5) 

ATE0953BPP 7 (7-8) 

ATE0953CPP 3 (7-6) 

ATE0953RPP 7 (7-8) 

ATE0953SPP 3 (7-6) 

ATE1243BPP 5 (7-7) 

ATE1243CPP 1 (7-5) 

ATE1243RPP 5 (7-7) 

ATE1243SPP 1 (7-5) 

ATE1253BPP 7 (7-8) 

ATE1253CPP 3 (7-6) 

ATE1253RPP 7 (7-8) 

ATE1253SPP 3 (7-6) 

ATE1545BPP 5 (7-7) 

ATE1545CPP 1 (7-5) 

ATE1545RPP 5 (7-7) 

ATE1545SPP 1 (7-5) 

ATE1555BPP 7 (7-8) 

ATE1555CPP 3 (7-6) 

ATE1555RPP 7 (7-8) 

ATE1555SPP 3 (7-6) 

Wiring Diagram Charts 

7-1 

• Page 7-2 shows the strip circuit chart for 

“standard control” models. Page 7-4 shows 

the strip circuit chart for “remote thermostat” 

models. 

• Each strip circuit has a reference number 

that is listed in the charts. The “condition” 

for each strip circuit is shown at the top of 

each column, along with the page number 

(parentheses) for the strip circuit. 

Model # 

Wiring Diagram # 

And (Page #) 

ATR0743BPP 6 (7-8) 

ATR0743CPP 2 (7-6) 

ATR0743RPP 6 (7-8) 

ATR0743SPP 2 (7-6) 

ATR0753BPP 8 (7-9) 

ATR0753CPP 4 (7-7) 

ATR0753RPP 8 (7-9) 

ATR0753SPP 4 (7-7) 

ATR0943BPP 6 (7-8) 

ATR0943CPP 2 (7-6) 

ATR0943RPP 6 (7-8) 

ATR0943SPP 2 (7-6) 

ATR0953BPP 8 (7-9) 

ATR0953CPP 4 (7-7) 

ATR0953RPP 8 (7-9) 

ATR0953SPP 4 (7-7) 

ATR1243BPP 6 (7-8) 

ATR1243CPP 2 (7-6) 

ATR1243RPP 6 (7-8) 

ATR1243SPP 2 (7-6) 

ATR1253BPP 8 (7-9) 

ATR1253CPP 4 (7-7) 

ATR1253RPP 8 (7-9) 

ATR1253SPP 4 (7-7) 

ATR1545BPP 6 (7-8) 

ATR1545CPP 2 (7-6) 

ATR1545RPP 6 (7-8) 

ATR1545SPP 2 (7-6) 

ATR1555BPP 8 (7-9) 

ATR1555CPP 4 (7-7) 

ATR1555RPP 8 (7-9) 

ATR1555SPP 4 (7-7)

Model # 

Strip Circuit Chart For Standard Control Models 

Compressor 

Cooling 

Compressor 

Heating 

7-2 

Electric Heat Reversing Valve 

ATE0743CPP #6 - Pg. 7-11 NA #10 - Pg. 7-13 NA 

ATE0743SPP #6 - Pg. 7-11 NA #10 - Pg. 7-13 NA 















ATR0743CPP #6 - Pg. 7-11 #7 - Pg. 7-12 #8 or #9 - Pg. 7-12 #7, #8, or #9 - Pg. 7-12 

ATR0743SPP #6 - Pg. 7-11 #7 - Pg. 7-12 #8 or #9 - Pg. 7-12 #7, #8, or #9 - Pg. 7-12 














ATR1555SPP #6 - Pg. 7-11 #7 - Pg. 7-12 #8 or #9 - Pg. 7-12 #7, #8, or #9 - Pg. 7-12

Model #Fan Only 

Cool/Heat- 

Continuous 

Run Fan 

7-3 

Cool- 

Cycling 

Fan 

Heat-Cycling 

Fan 

ATE0743CPP #1 - Pg. 7-10 #2 - Pg. 7-10 #3 - Pg. 7-10 #4 - Pg. 7-11 

ATE0743SPP #1 - Pg. 7-10 #2 - Pg. 7-10 #3 - Pg. 7-10 #4 - Pg. 7-11 















ATR0743CPP #1 - Pg. 7-10 #2 - Pg. 7-10 #3 - Pg. 7-10 #4 - Pg. 7-11 

ATR0743SPP #1 - Pg. 7-10 #2 - Pg. 7-10 #3 - Pg. 7-10 #4 - Pg. 7-11 














ATR1555SPP #1 - Pg. 7-10 #2 - Pg. 7-10 #3 - Pg. 7-10 #4 - Pg. 7-11

Model # 

Strip Circuit Chart For Remote Thermostat Models 

Compressor 

Cooling 

Compressor 

Heating 

7-4 

Electric Heat 

Reversing 

Valve 

Fan Motor 

ATE0743BPP #12 - Pg. 7-14 NA #17 - Pg. 7-17 NA #11 - Pg. 7-14 

ATE0743RPP #12 - Pg. 7-14 NA #17 - Pg. 7-17 NA #11 - Pg. 7-14 















ATR0743BPP #12 - Pg. 7-14 #13 - Pg. 7-15 #15 or #16 - Pg. 7-16 #14 - Pg. 7-15 #11 - Pg. 7-14 

ATR0743RPP #12 - Pg. 7-14 #13 - Pg. 7-15 #15 or #16 - Pg. 7-16 #14 - Pg. 7-15 #11 - Pg. 7-14 














ATR1555RPP #12 - Pg. 7-14 #13 - Pg. 7-15 #15 or #16 - Pg. 7-16 #14 - Pg. 7-15 #11 - Pg. 7-14

DIAGRAM #1 

WIRING DIAGRAMS 

7-5

DIAGRAM #2 

DIAGRAM #3 

7-6

DIAGRAM #4 

DIAGRAM #5 

7-7

DIAGRAM #6 

DIAGRAM #7 

7-8

DIAGRAM #8 

7-9

(#1) FAN ONLY 

L1 

L1 8 H 

STRIP CIRCUITS 

Standard Control Models 

(#2) COOL OR HEAT—FAN MOTOR CONTINUOUS RUN 

(#3) COOL—FAN MOTOR CYCLING 

L1 

L1 

FUSE 

(265V 

MODELS 

ONLY) 

FUSE 

(265V 

MODELS 

ONLY) 

FUSE 

(265V 

MODELS 

ONLY) 

SYSTEM 

SWITCH 

SYSTEM 

SWITCH 

SYSTEM SWITCH 

FAN CYCLE 

SWITCH 

L1 2 3 2 

BK 

FAN MOTOR 

SYSTEM 

SWITCH 

9 

H 

L 

(9 - H = HIGH) 

(9 - L = LOW) 

(HIGH) 

BK 

(LOW) 

R 

SYSTEM 

MAIN 

SWITCH FAN CYCLE 

THERMOSTAT 

SWITCH 

BK BU BU 

L1 2 2 3 

3 5 

1 2 

7-10 

Y R 

BR 

C 

F 

FAN MOTOR 

SYSTEM 

SWITCH 

9 

H 

(9 - H = HIGH) 

(9 - L = LOW) 

L 

(HIGH) 

BK 

(LOW) 

R 

BR 

SYSTEM SWITCH 

COM L2 

Y R 

C 

F 

FAN MOTOR 

SYSTEM SWITCH 

BR 

COM L2 

Y R 

C 

F 

L2 

COM L2 

L2 

SYSTEM SWITCH 

L2

(#4) HEAT—FAN MOTOR CYCLING 

L1 

(#5) COMPRESSOR COOLING (HEAT PUMP MODELS) 

L1 

(#6) COMPRESSOR COOLING (NON-HEAT PUMP MODELS) 

L1 

FUSE 

(265V 

MODELS 

ONLY) 

FUSE 

(265V 

MODELS 

ONLY) 

L1 2 2 3 

FUSE 

(265V 

MODELS 

ONLY) 

SYSTEM 

SWITCH 

SYSTEM 

SWITCH 

SYSTEM 

SWITCH 

MAIN 

THERMOSTAT 

L1 2 3 

2 

MAIN 

THERMOSTAT 

SYSTEM 

SWITCH 

FAN CYCLE 

SWITCH 

BK R BU Y 

L1 2 2 1 

1 5 

SYSTEM 

SWITCH 

BK BU BK 

BK 

3 5 

1 2 

COMPRESSOR 

MAIN 

THERMOSTAT 

BK BU 

SYSTEM 

SWITCH 

HOT START 

RELAY 

BU R 

DEFROST 

THERM. 

OVERLOAD 

BK 

S 

3 5 4 5 2 3 

C 

R 

SYSTEM 

SWITCH 

6 4 

SYSTEM 

SWITCH 

9 

7-11 

(9 - H = HIGH) 

(9 - L = LOW) 

H 

L 

(HIGH) 

BK 

(LOW) 

R 

OVERLOAD 

COMPRESSOR 

C 

FAN MOTOR 

S 

R 

Y R 

BU 

BR 

BU 

R 

R 

C 

F 

H 

C 

H 

C 

R 

SYSTEM SWITCH 

R 

COM L2 

SYSTEM SWITCH 

COM L2 

SYSTEM SWITCH 

COM L2 

L2 

L2 

L2

(#7) COMPRESSOR HEATING—HOT START SENSOR OPEN— 

ROOM ABOVE 65°F (HEAT PUMP MODELS) 

L1 

FUSE 

(265V 

MODELS 

ONLY) 

SYSTEM 

SWITCH 

MAIN 

THERMOSTAT 

BK 

R 

SYSTEM 

SWITCH 

HOT START 

RELAY 

BU R 

DEFROST 

THERM. 

OVERLOAD 

BK 

1 5 4 5 2 3 

L1 2 2 1 

BK 

OR 

REV. VALVE SOLENOID 

ANTICIPATOR 

7-12 

OR 

7 6 

COMPRESSOR 

C 

S 

R 

BU 

R 

H 

C 

R 

SYSTEM SWITCH 

COM L2 

(#8) ELECTRIC HEAT—HOT START SENSOR OPEN—ROOM ABOVE 65°F 

AND OUTDOOR AMBIENT BELOW 47°F (HEAT PUMP MODELS) 

L1 

FUSE 

(265V 

MODELS 

ONLY) 

SYSTEM 

SWITCH 

(#9) ELECTRIC HEAT—HOT START SENSOR CLOSED—ROOM BELOW 50°F 

(HEAT PUMP MODELS) 

L1 

FUSE 

(265V 

MODELS 

ONLY) 

MAIN 

THERMOSTAT 

BK 

R 

SYSTEM 

SWITCH 

HOT START 

RELAY 

BU R 

DEFROST 

THERM. 

BR 

1 5 4 5 2 1 

L1 2 2 1 

L1 2 1 

2 

BK 

BK 

BK 

OR OR 

SYSTEM 

SYSTEM HOT START 

MAIN 

SWITCH SWITCH 

RELAY 

HEAT 

THERMOSTAT 

LIMIT SW 

BK 

R 

BU 

BR 

1 5 

SYSTEM SWITCH 

HOT START 

RELAY COIL HOT START 

BU WH BR 

SENSOR 

R 

3 

OR 

8 

ANTICIPATOR 

1 3 

OR 



ANTICIPATOR 

BK 

HEAT 

LIMIT SW 

HEATING 

ELEMENT 

HEATING 

ELEMENT 

SYSTEM 

SWITCH 

R TN 

7 6 

SYSTEM 

SWITCH 

R TN 

7 6 

SYSTEM SWITCH 

COM L2 

SYSTEM SWITCH 

COM L2 

L2 

L2 

L2

(#10) ELECTRIC HEAT 

(NON-HEAT PUMP MODELS) 

L1 

FUSE 

(265V 

MODELS 

ONLY) 

SYSTEM 

SWITCH 

MAIN 

THERMOSTAT 

BK R 

L1 2 2 1 

SYSTEM 

SWITCH 

1 5 

BU 

ANTICIPATOR 

OR OR 

SYSTEM 

SWITCH 

6 7 

R 

7-13 

HEATING 

ELEMENT 

HEAT 

LIMIT SW 

SYSTEM SWITCH 

COM L2 

L2

(#11) FAN MOTOR OPERATION 

L1 

(#12) COMPRESSOR COOLING 

L1 

H 

C 

C 

F 

BR 

BU 

R 

Y 

FAN MOTOR 

COMPRESSOR 

S 

C 

Remote Thermostat Models 

R 

R 

BK 

1 

3 

OVERLOAD 

FAN SPEED 

SWITCH 

2 

BU 

BK 

SUCTION LINE 

THERMO 

BK 

7-14 

FAN RELAY 

2 4 

COM 24V 

TRANSFORMER 

COOLING RELAY 

2 4 

3 1 

WALL THERMO. 

COM 24V Y R Y 

TRANSFORMER 

R 

PU 

G 

WALL THERMO. 

FUSE (265V 

MODELS ONLY) 

L2 

FUSE (265V 

MODELS ONLY) 

L2

(#13) COMPRESSOR HEATING—HOT START SENSOR OPEN— 

ROOM ABOVE 65°F, REVERSING VALVE ENERGIZED (SEE #14) 


L1 

H 

C 

BU 

R 

S 

C 

R 

HOT START 

DEFROST 

RELAY 

OVERLOAD THERM. 

R 

BK RD BU 

3 2 5 4 1 

1 3 

(#14) REVERSING VALVE (HEAT PUMP MODELS) 

L1 

COMPRESSOR 

REV. VALVE REV. VALVE 

HEATING SOLENOID COIL RELAY 

BK RELAY BK BK 

7-15 

RD 

4 4 2 

RD 

HEATING 

RELAY 

BU 

COM 24V R W 

TRANSFORMER 

WH 

COM 24V R B 

TRANSFORMER 

FUSE (265V 

MODELS ONLY) 

WALL THERMO. 

FUSE (265V 

MODELS ONLY) 

WALL THERMO. 

L2 

L2

(#15) ELECTRIC HEAT—HOT START SENSOR CLOSED— 

ROOM BELOW 50°F, REVERSING VALVE ENERGIZED (SEE #14) 


L1 

L1 

HOT START 

HEATING 

ELECTRIC HEATER 

RELAY 

RELAY 

BK TN HEATER LIMIT SW 

BR 

BU 

BK 

4 6 

BK 

HEATING 

RELAY TN 

4 6 

ELECTRIC 

HEATER 

HEATER 

LIMIT SW 

3 1 

7-16 

HOT START 

SENSOR 

RD 

DEFROST 

HOT START 

RELAY 

BR 

THERM. 

RD 

BU 

1 2 

RD 

1 

3 

COM 24V 

TRANSFORMER 

HEATING 

RELAY 

5 4 1 1 3 

BU 

FUSE (265V 

MODELS ONLY) 

WALL THERMO. 

R W 

(#16) ELECTRIC HEAT—HOT START SENSOR OPEN—ROOM ABOVE 65°F, 

AND OUTDOOR AMBIENT BELOW 47°F, REVERSING VALVE ENERGIZED 

(SEE #14) (HEAT PUMP MODELS) 

BU 

COM 24V R W 

TRANSFORMER 

WALL THERMO. 

L2 

FUSE (265V 

MODELS ONLY) 

L2

(#17) ELECTRIC HEAT (NON-HEAT PUMP MODELS) 

L1 

HEATER 

HEATING 

RELAY 

BK 

LIMIT SWITCH HEATING ELEMENT 

Y 

BK 

RD 

7-17 

2 4 

BU 

COM 24V R W 

TRANSFORMER 

FUSE (265V 

MODELS ONLY) 

WALL THERMO. 

L2

— NOTES — 

7-18

WARNING 




operating. 



NOTE: Units are to be inspected and serviced 

by qualified Whirlpool service personnel only. 

1. Clean the unit air intake filter after 300 to 

350 hours of operation with a mild detergent 

in warm water. Allow the filter to dry 

thoroughly before reinstalling it. 

2. The indoor (evaporator) coil, the outdoor 

(condenser) coil, and base pan should be 

inspected periodically (every 6 to 12 

months), and cleaned of all debris (lint, 

dirt, leaves, paper, etc.). Clean the coils 

and base pan with a soft brush and compressed 

air, or vacuum. 

If you use a pressure washer, be careful 

not to bend the aluminum fin pack. Use an 

up and down sweeping motion in the direction 

of the vertical aluminum fin pack. 

Cover all electrical components to protect 

them from water. Allow the unit to dry 

thoroughly, 

3. Inspect all gasket material for deterioration. 

IMPORTANT: Do not use a caustic coil cleaning 

agent on the coils or base pan. Use only 

a biodegradable cleaning agent. 

TECH TIPS 

ROUTINE MAINTENANCE 

8-1 

4. Before reinstalling the chassis in the sleeve, 

inspect the indoor blower housing, the 

blower wheel, condenser fan blade, and 

condenser shroud periodically (every 6 to 

12 months). Remove all debris (lint, dirt, 

mold, fungus, etc.) 

5. Clean the blower housing area and blower 

wheel with an antibacterial / antifungal 

cleaner. 

6. Use a biodegradable cleaning agent and 

degreaser on the condenser fan and condenser 

shroud. Use warm or cold water 

when rinsing these items, and allow them 

to dry thoroughly before reinstalling them. 

7. Periodically (every 6 to 12 months) inspect 

all control components, both electrical 

and mechanical, as well as the power 

supply. Use the proper testing instruments 

(voltmeter, ohmmeter, ammeter, wattmeter, 

etc.) to perform any electrical tests. 

8. Use an air conditioning or refrigeration 

thermometer to check room, outdoor, and 

coil operating temperatures. Use a sling 

psychrometer to measure wet bulb temperatures 

indoors and outdoors. 

9. Inspect the inside and outside surrounding 

areas to ensure that the unit clearances 

have not been compromised or 

altered. 

10. Inspect the wall sleeve and drain system 

periodically (every 6 to 12 months) and 

clean them of all obstructions and debris. 

Clean both areas with an antibacterial and 

antifungal cleaner, and rinse both items 

thoroughly with water. Make sure that the 

drain outlets are operating correctly. Check 

the sealant around the sleeve and reseal 

any areas, as needed. 

11. Clean the front cover with a mild detergent 

and warm water, and allow it to dry thoroughly 

before installing it in the chassis.

ACCESSORIES 

PART NUMBER DESCRIPTION PHOTO 

4396585 

4396586 

4396591 

4396595 

4396587 

4396594 

4396592 

4396590 

WALL SLEEVE: 

• G-90 zinc coated steel is prepared in an 

eleven-step process, then electrostatically 

coated with a polyester finish, and cured 

in an oven for exceptional durability. 

• The wall sleeve is insulated for thermal 

efficiency. 16″ H x 42″ W x 13-3/4″ D. 

STANDARD GRILLE: 

• Stamped aluminum. 

• Anodized to resist chalking and oxidation. 

ARCHITECTURAL LOUVERS: 

• Heavy-gauge 6063-T5 aluminum alloy. 

• Clear, extruded aluminum. 

• Dark bronze acrylic enamel. 

• Also available in custom colors. 

CONDENSATE DRAIN KIT: 

• Attaches to the bottom of the wall sleeve 

for internal draining of condensate or to 

the rear wall sleeve flange for external 

draining. 

• Recommended on all units to remove 

excess condensate. 

• Packaged in quantities of ten. 

DEEP WALL SLEEVE EXTENSION: 

• 4″ deep anodized aluminum extension 

that attaches to the outside of the wall 

sleeve when the wall is thicker than 13″ 

thick (11-3/4″ when a subbase is used, 

12-3/4″ when a lateral duct is used). 

DECORATIVE SUBBASE: 

• Provides unit support for walls less than 

6″ thick. 

• Includes leveling legs, side filler panels 

and mounting brackets for electrical 

accessories. 

• Accepts a circuit breaker, power disconnect 

switch, or conduit kit. 

DESK CONTROL KIT: 

• A field installed kit which allows the unit to 

be turned On or Off from a remote location. 

8-2

PART NUMBER DESCRIPTION PHOTO 

4396597 

4396593 

4396583 

4396600 

4396601 

ATXFT0 

CONDUIT KIT WITH JUNCTION BOX: 

• Makes field wiring connections for direct 

wired 265V PTAC/PTHPs. 

• Kit includes a means of quick-disconnect 

for easy removal of the chassis. 

• It can be used with or without a subbase. 

DIGITAL REMOTE THERMOSTAT: 

• A Honeywell wall-mounted remote thermostat. 

Requires a single stage cooling 

and heating thermostat. 

SLEEVE EXTENSION RETROFIT KIT: 

• G-90 zinc coated steel, 2.4″ sleeve 

extension attached to the room-side of the 

sleeve to allow for the installation of a 

P-Series unit. 

LATERAL DUCT ADAPTER: 

• Attaches to the PTAC/PTHP unit and 

provides a transition to direct up to 35% of 

the total CFM to a secondary room, either 

left or right of the unit. 

• Kit includes duct plenum with a discharge 

grille. 

LATERAL DUCT EXTENSION: 

• A three foot insulated plenum that attaches 

to the left or right side of the duct 

adapter. 

• The extension can be cut to length by the 

installer. 

REPLACEMENT FILTER PACK: 

• Original equipment return air filters. 

• Reusable and can be cleaned by vacuuming 

or washing. 

Additional Components: 

4396598 Disconnect Switch: Installed in the subbase and provides a means for disconnecting 

power to the PTAC/PTHP. 

4396602 Front Cover Side Modifies the method of attaching the front cover when the 

Mount Kit: PTAC/PTHP is mounted close to or against the floor. 

8-3

OPTIONAL DESK CONTROL UNIT 

The desk control unit allows the air conditioner 

to be turned off and on from a remote location. 

The unit consists of a pair of switches that are 

controlled by a 24-volt relay. 

TO PTAC 

SELECTOR 

SWITCH 

DESK CONTROL RELAY (N.C.) 

When the desk control switch is closed, the 24volt 

supply is applied to the relay coil,the contacts 

open, and the air conditioner will not 

TO PTAC 

SELECTOR 

SWITCH 

DESK CONTROL RELAY (N.C.) 

8-4 

The main power supply is wired in series through 

the relay contacts. When the desk control 

switch is open, the 24-volt supply is removed 

from the relay coil, the contacts are closed, and 

the air conditioner will operate. 

L1 POWER SUPPLY 


24 VOLTS 

FROM DESK 

operate.The air conditioner will not run as long 

as the 24 volts is present at the desk control 

unit. 



24 VOLTS 

FROM DESK

GENERAL TROUBLESHOOTING 

If the PTAC/PTHP is not working satisfactorily, 

follow these basic troubleshooting suggestions. 

Being familiar with the sequence of operation 

on Standard Controlled Operating Units or the 

operation of the Remote Thermostat Controlled 

Units is important. The following questions and 

answers may help to identify performance problems. 

ENVIRONMENTAL EFFECTS— 

COOLING MODE 

• Is the PTAC/PTHP sized to the room size 

area and the cooling load demand? Room 

width x length x 3.5 equals an approximation 

of the number of BTU’s required for the area. 

Other factors can affect the number of BTU’s 

required for an area, such as, the number of 

electrical devices, solar gains, etc. Consider 

these factors when sizing the PTAC/PTHP 

for your application. 

• Is the outdoor temperature 60°F (15.6°C) 

or below? The PTAC/PTHP is designed for 

proper cooling operation at outdoor temperatures 

above 60°F (15.6°C). 

• Is the indoor temperature 80°F (26.7°C) or 

above? Ambient indoor temperatures of 80°F 

(26.7°C) or above will take a longer period of 

run time to cool down the area. Long run 

times may indicate that the PTAC/PTHP is 

undersized. 

• Is indoor humidity high? This condition will 

cause the PTAC/PTHP to operate longer to 

remove humidity before noticing any cooling 

effect. 

• Has the cooling load been increased by 

additional devices such as computer 

equipment or has the room area been 

increased where the PTAC/PTHP is located? 

If conditions have changed, the 

PTAC/PTHP may not be able to cool and 

condition as effectively as previously planned. 

8-5 

ENVIRONMENTAL EFFECTS— 

HEATING MODE 

• Is the PTAC/PTHP properly sized to the 

room area and heat load demand? Multiplying 

the width x length x 3.5 provides an 

approximation of the number of BTU’s required 

for the area. Other factors can affect 

the number of BTU’s required for an area, 

such as, the number of electrical devices, 

solar gains, etc. Consider these factors when 

sizing the PTAC/PTHP for your application. 

• Is the outdoor temperature 70°F (21.1°C) 

or above? The PTAC/PTHP is designed for 

proper heating operation at outdoor temperatures 

below 70°F (21.1°C). 

• Is the indoor temperature 60°F (15.6°C) or 

below? Ambient indoor temperatures of 60°F 

(15.6°C) or below will take a longer period of 

run time to heat the area. Long run times may 

indicate that the PTAC/PTHP is undersized. 

• Has the room area been increased where 

the PTAC/PTHP is located? If the area 

where the PTAC/PTHP is located has been 

increased, the PTAC/PTHP may not provide 

adequate heat. 

INSUFFICIENT MAINTENANCE 

AND INSPECTION 

Installation errors are the most common cause 

of poor performance. Please follow the installation 

instructions carefully.

— NOTES — 

8-6

PRODUCT SPECIFICATIONS 

AND 

WARRANTY INFORMATION SOURCES 

IN THE UNITED STATES: 

FOR PRODUCT SPECIFICATIONS AND WARRANTY INFORMATION CALL: 

FOR TECHNICAL ASSISTANCE WHILE AT THE CUSTOMER’S HOME CALL: 

THE TECHNICAL ASSISTANCE LINE: 1-800-253-2870 

HAVE YOUR STORE NUMBER READY TO IDENTIFY YOU AS AN 

AUTHORIZED SERVICER 

FOR LITERATURE ORDERS: 

PHONE: 1-800-851-4605 

FOR TECHNICAL INFORMATION AND SERVICE POINTERS: 

IN CANADA: 

FOR WHIRLPOOL PRODUCTS: 1-800-253-1301 

FOR KITCHENAID PRODUCTS: 1-800-422-1230 

FOR ROPER PRODUCTS: 1-800-447-6737 

www.servicematters.com 

FOR PRODUCT SPECIFICATIONS AND WARRANTY INFORMATION CALL: 

1-800-461-5681 

FOR TECHNICAL ASSISTANCE WHILE AT THE CUSTOMER’S HOME CALL: 

THE TECHNICAL ASSISTANCE LINE: 1-800-488-4791 

HAVE YOUR STORE NUMBER READY TO IDENTIFY YOU AS AN 

AUTHORIZED SERVICER

CORPORATION

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