Carrier 52C Users Manual

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52C,P
SERIES

SERVICE TECHNICIAN GUIDE

PACKAGED TERMINAL AIR CONDITIONERS
AND HEAT PUMPS
CONTENTS
Page
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,3
SUMMARY OF DANGERS, WARNINGS,
AND CAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
UNIT DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,4
TOOLS NEEDED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
REMOVE FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . 3
DISCONNECT POWER FOR
CORD-CONNECTED UNIT . . . . . . . . . . . . . . . . . . . . . 3
DISCONNECT POWER FOR PERMANENTLY
CONNECTED (HARDWIRED) UNITS . . . . . . . . . . . . 3
OPEN THE CONTROL BOX . . . . . . . . . . . . . . . . . . . . . 4
REMOVE THE UNIT FROM THE WALL SLEEVE . . 4
ACCESSING UNIT COMPONENTS . . . . . . . . . . . . . .5-8
ACCESSING INDOOR-AIR SECTION
COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
ACCESSING OUTDOOR-AIR SECTION
COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
REINSTALL FRONT PANEL . . . . . . . . . . . . . . . . . . . . . 8
GENERAL CLEANING . . . . . . . . . . . . . . . . . . . . . . . . .9-12
CLEANING AND SAFETY . . . . . . . . . . . . . . . . . . . . . . 9
TOOLS NEEDED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
MONTHLY CLEANING. . . . . . . . . . . . . . . . . . . . . . . . 10
SEASONAL CLEANING . . . . . . . . . . . . . . . . . . . . . . . 11
COMPRESSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-17
COMPRESSOR TROUBLESHOOTING . . . . . . . . . . . 14
BASIC HERMETIC COMPRESSOR
ELECTRICAL MEASUREMENTS . . . . . . . . . . . . . . . 14
COMPRESSOR REPLACEMENT . . . . . . . . . . . . . . . . 15

Page
HEATERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18,19
COMMON CAUSES OF HEATER FAILURE. . . . . . . 18
HEATER REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
OPERATING CONTROLS. . . . . . . . . . . . . . . . . . . . . 20-28
UNIT-MOUNTED CONTROLS . . . . . . . . . . . . . . . . . . 20
WALL-MOUNTED THERMOSTAT CONTROLS . . . 21
REMOTE THERMOSTAT
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 21
DESCRIPTION OF SELECTOR
SWITCH SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
NON-USER ADJUSTABLE CONTROLS . . . . . . . . . . 23
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . 24
COMPONENT OPERATION AND
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 24
ELECTRICAL COMPONENTS REMOVAL
AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . 27
FAN MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-31
FAN MOTOR TROUBLESHOOTING. . . . . . . . . . . . . 29
BASIC FAN MOTOR ELECTRICAL TESTS . . . . . . . . 29
FAN MOTOR REPLACEMENT . . . . . . . . . . . . . . . . . . 31
FIELD TEMPERATURE CHARTS . . . . . . . . . . . . . . 32-40
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . 41-45
MOST FREQUENT PTAC SERVICE
QUESTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
ACCESSORIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
52C PERFORMANCE AND PHYSICAL DATA. . . . . . 48
52P PERFORMANCE AND PHYSICAL DATA . . . . . . 49

PTAC Customer Support Center
1•800•894•6449

52C,P
SERIES
INTRODUCTION
The focus of this manual is to provide basic information
on service procedures, safety, troubleshooting, cleaning, and component replacement for service technicians. It is intended for use only by HVAC service
technicians who have successfully completed
instruction and received Type I Certification
from the U.S. Environmental Protection Agency.
The instructions in this manual are general in nature
and are not to be substituted for installation and service instructions shipped with the unit. No attempt to
install, operate, adjust, repair, or dismantle any equipment should be made until the manufacturer’s instructions are read and thoroughly understood by the
service technician. Even equipment that seems familiar may have specific model differences from year to
year. Always review manufacturer’s instructions.
Model 52C,P packaged terminal air conditioner
(PTAC) and heat pump units are self-contained for
installation through the wall for individual room heating and cooling. The Model 52C,P polymer and metal
sleeves are permanently fastened to the wall; the unit
chassis slides out of the sleeve to allow the service
technician easy access. Many accessories are offered
to complement the unit’s performance and comfort
control.
Before beginning any service procedures, it is important to check the unit model number. See Figure 1 and
2. Units that seem similar may have subtle differences
that could affect service procedures. The following
units are covered in this manual:
52CE — 60 Hz cooling with electric heat units
52CQ — 60 Hz heat pump with electric heat units
52PE — 60 Hz cooling with electric heat units
52PQ — 60 Hz heat pump with electric heat units
52PC — 60 Hz cooling only units
Knowing which model is being serviced will help determine if the unit is performing at optimum levels. The
model number is located on the data information plate
beneath the front panel of the unit. See Figure 1. The
data information plate also lists voltage ranges and
other important electrical information about the unit.

Potential hazards or unsafe practices which
COULD result in minor personal injury or equipment damage.

MODEL

52PQA312301AA

SERIAL

3701X11520

DATE OF MFG.
VOLT RANGE
VOLTS
PH

09/12/2001
187-253

230/208
HZ

MIN CKT AMPACITY
R-22 OZ

19.3

DESIGN PSIG 350 HIGH SIDE, 150 LOW SIDE

COOLING
BTU/HR
12,100/12,000
AMPS
4.8/5.3
WATTS

1090/1122

EER

11.1/10.7
RLA

6.1

LRA

COMP
FAN

FLA

0.75

MOTOR

1/8

HEATING
BTU/HR
AMPS

11,000/11,000
15.6/14.5

WATTS

3570/2997

COP

3.2/3.2

HEATER
BTU/HR

AMPS

14.8/13.7

WATTS

3400/2850

WATER
STEAM

USE

AMP CANADIAN INSTALLATION
MAX FUSE MAX BREAKER

TIME DELAY FUSE
OR HACR TYPE
CIRCUIT BREAKER

AMP

SUMMARY OF DANGERS, WARNINGS,
AND CAUTIONS
The terms DANGER, WARNING, and CAUTION have
specific meanings that identify the degree of hazard.
Typically in the HVAC industry, these specific meanings are:
FIGURE 1 — SAMPLE DATA INFORMATION
PLATE

There is an immediate hazard which WILL result
in severe personal injury or death.

Hazards or unsafe practices which COULD
result in severe personal injury or death.

Series Designation
PTAC (Packaged Terminal Air Conditioner)
CE
CQ
PC
PE
PQ

–
–
–
–
–

Chassis Options
Blank or AA – Standard
CP – Corrosion Protection
RC – Wall Thermostat Control
RP – Wall Thermostat Control with
Corrosion Protection

Cooling with Electric Heat
Heat Pump with Electric Heat
Cooling Only
Cooling with Electric Heat
Heat Pump with Electric Heat

Latest Revision
A– Z

Packaging
1 – Domestic

Electric Heater Size
0 – No Heating (Cooling Only Model)
2 – 2.3 kW
3 – 3.4 kW
5 – 5.0 kW

Non-Performance
Changes 0-9

Cooling Capacity (nominal)
07 – 7,000 Btuh
09 – 9,000 Btuh
12 – 12,000 Btuh
15 – 15,000 Btuh

Electrical Data
3 – 230/208-v, 60 Hz
4 – 265-v, 60 Hz

FIGURE 2 — MODEL NUMBER NOMENCLATURE

UNIT DISASSEMBLY
See Figure 3. If a lateral duct accessory is installed, the
plenum must be removed before removing the front
panel. Refer to Remove Lateral Duct Extension section
for removal instructions.
1. Grasp the front panel firmly at the center of the
top and bottom of the panel.
2. Pull the panel upward at the bottom and forward
at the top to release magnetic latches and partition
hooks. See Figure 4.

This section includes common procedures for disassembly and re-assembly of unit.
IMPORTANT: Follow manufacturer’s instructions when disassembling and re-assembling a
unit for cleaning, maintenance, or part replacement. When disassembling wiring, it is strongly
recommended that numbered stickers be
attached to identify leads and terminals to aid in
the re-assembly process. Always review safety
procedures prior to the start of a job.

DISCONNECT POWER FOR
CORD-CONNECTED UNIT
1. Turn selector switch to OFF position.
2. Open the disconnect switch at main power supply.
Use proper Lockout and Tag procedures.
3. Unplug the unit service cord.

Prior to servicing electrical equipment, disconnect all power to avoid electric shock! Tag all disconnects. Never alter cord or plug and do not use
extension cords.

DISCONNECT POWER FOR
PERMANENTLY CONNECTED
(HARDWIRED) UNITS

TOOLS NEEDED
The following field-supplied items are recommended
for general disassembly of the unit:
• Flat head screw driver
• 5/16-in. nut driver
• Safety glasses
• Needle nose pliers

1. Turn selector switch to OFF position.
2. Open the disconnect switch at main power supply.
Use proper Lockout and Tag procedures.
3. Remove screw from access cover and remove
access cover.
4. Pull out the plug assembly and disconnect. See
Figure 5.

REMOVE FRONT PANEL
NOTE: Before removing front panel, remove 2 locking
screws (if installed) located behind the filter handles.

52C,P
SERIES
OPEN THE CONTROL BOX
The control box is factory wired. To open the box,
remove the 2 screws on the top of the control box and
lower the front hinged panel. See Figure 6.

REMOVE THE UNIT FROM THE
WALL SLEEVE
1. Remove the four mounting screws that secure the
PTAC unit to the wall sleeve (2 screws per side).
See Figure 7.
2. Grasp the sides of the unit and slide it from the
sleeve.
NOTE: The mounting screws may be in a different
location depending on brand of wall sleeve
attached.
REMOVABLE
FILTER

LOCATION OF
REMOVED FILTER

LOCKING SCREW
(NOTE: 2nd LOCKING SCREW
IS LOCATED BEHIND
2nd FILTER)

The chassis weighs between 110 and 150 lbs. Take
proper safety precautions to avoid personal injury
when lifting and moving the chassis.

FIGURE 3 — LOCATION OF LOCKING SCREWS
BEHIND FILTERS

The unit basepan may have water in it. Tilt the
unit back slightly when removing it from the sleeve
to drain some of the water into the sleeve.

CONDUIT

ACCESS
PANEL

MOLEX
PLUGS

FIGURE 5 — PLUG ASSEMBLY ON
HARDWIRE UNITS
FIGURE 4 — REMOVING FRONT PANEL
eplacement Package Terminal Air Conditioner,
LASSIFIED BY UNDERWRITERS LABORATOIES INC., AS TO ELECTRIC SHOCK, FIRE AND
ASUALTY HAZARDS ONLY. FOR FIELD INSTALATION WITH EXISTING WALL SLEEVES, OUTOOR, LOUVERS, AND INDOOR PANELS AS
PECIFIED ON THE PRODUCT.

CONTROL
BOX
SCREWS

VARIOUS ATTACHMENT
HOLE LOCATIONS

POWER
CORD
ACCESS
COVER

AMANA, TRANE
(SLOTTED
HOLES) WALL
SLEEVE HOLES

POWER
CORD

FIGURE 6 — CONTROL BOX COVER

GE WALL
SLEEVE
HOLES

CARRIER, BRYANT
WALL SLEEVE
HOLES

FIGURE 7 — PTAC UNIT TO WALL
SLEEVE MOUNTING SCREWS

ACCESSING UNIT COMPONENTS
■

ACCESSING INDOOR-AIR SECTION
COMPONENTS

ACCESSING THE HEATER ASSEMBLY — Once the
discharge deck assembly is removed, the Heater
Assembly should now be accessible. See Figure 10.
1. Using pliers, carefully remove all wires connected
to the heater assembly. Label each wire for ease of
re-assembly.
2. Gently pull the heater assembly up and away
from scroll. See Figure 11.
3. Reassemble by reversing steps above.

■

REMOVE LATERAL DUCT EXTENSION
ACCESSORY FOR UNITS EQUIPPED WITH THE
LATERAL DUCT
1. Remove the 2 top screws that secure the lateral
duct plenum to the top of the lateral duct extension. See Figure 8.
2. Locate and remove the 2 bottom bracket screws
(located opposite extension duct) that secure the
lateral duct plenum to the bracket flange. See
Figure 8.
3. Carefully lift the plenum up and away from front
panel and duct extension.

ACCESSING OUTDOOR-AIR SECTION
COMPONENTS
■

■

REMOVE THE DISCHARGE DECK ASSEMBLY
1. Remove the front panel. Refer to Remove Front
Panel section and Figure 4.
2. Remove discharge screen screw using a 5/16-in. nut
driver. See Figure 9.
3. Remove the discharge deck assembly screws using
a 5/16-in. nut driver. See Figure 9.
4. Gently pull the deck/grille up and away from the
unit.
5. Reassemble by reversing steps above.

REMOVE THE GUSSETS (See Figure 12)
1. Remove the 2 screws on each side that secure the
gussets to the partition.
2. Remove the 2 screws that secure the gussets to
the plastic condenser orifice and remove the
gussets.

52C,P
SERIES
END CAP

PLENUM

LATERAL DUCT
EXTENSION

TOP
SCREWS (2)

WALL

BRACKET
SCREWS

RIGHT
BRACKET

LEFT
BRACKET

BRACKET
SCREWS

FIGURE 8 — PTAC UNIT WITH LATERAL
DUCT ACCESSORY INSTALLED

DISCHARGE DECK

FIGURE 10 — ACCESSING HEATER
PLATE ASSEMBLY
ATTACHMENT
SCREWS
HEATER PLATE
ASSEMBLY

DISCHARGE
SCREEN

DISCHARGE
DECK

FIGURE 9 — LOCATION OF ATTACHMENT
SCREWS ON DISCHARGE DECK OF UNIT

FIGURE 11 — REMOVAL OF HEATER
PLATE ASSEMBLY

DETACH THE CONDENSER ORIFICE FROM THE
CONDENSER COIL
1. Remove top half of condenser orifice.
a. Unscrew the top half of the condenser orifice by
backing off the 4 captive screws. See Figure 13.
b. Using a flat head screwdriver, gently pry the
top half of the orifice from the tube sheets. See
Figure 14.
c. Remove top of condenser orifice. See Figure 15.
2. Remove bottom half of condenser orifice.
a. Using a flat head screwdriver, gently pry the
bottom half of the orifice from the tube sheets.
See Figure 14.
b. Remove 2 outdoor coil tube sheet screws using a
Phillips head screwdriver. See Figure 16.
c. Carefully lift condenser up and away from condenser fan. Rest condenser on basepan. See
Figure 17.

d. Using Needle Nose Pliers remove condenser fan
hub clamp. See Figure 18.
e. Pull condenser fan off fan motor shaft.
f. Remove bottom half of condenser orifice.
3. Reassemble by reversing steps above.

■

REMOVE THE AIR DISCHARGE GRILLE
1. Remove the front panel from the unit, reference
Remove Front Panel section.
2. Flip the front panel over to the backside. Remove
the 2 screws on each end of the air discharge grille
and remove grille. See Figure 19.
The grille can be positioned to direct the
discharge air up or out by simply rotating
the grille 180 degrees.

GUSSET

GUSSET
SCREWS

CONDENSER
ORIFICE (PLASTIC)

GUSSET
SCREWS

PARTITION

FIGURE 14 — PRYING CONDENSER ORIFICE
AWAY FROM TUBE SHEET

GUSSET

FIGURE 12 — GUSSET REMOVAL

CONDENSER
ORIFICE

CAPTIVE
SCREWS (2)

FIGURE 15 — REMOVING TOP OF
CONDENSER ORIFICE

FIGURE 13 — LOCATION OF CAPTIVE SCREWS
ON CONDENSER ORIFICE

52C,P
SERIES
CONDENSER
FAN

OUTDOOR COIL TUBE
SHEET SCREWS

HUB CLAMP

FIGURE 16 — LOCATION OF OUTDOOR
COIL TUBE SHEET SCREWS

FIGURE 18 — REMOVING CONDENSER
FAN HUB CLAMP

CONTROL DOOR
HINGE PINS

SCREW

FRONT PANEL
(BACK VIEW)

SCREW

DISCHARGE
GRILLE

FIGURE 19 — LOCATION OF SCREWS ON
DISCHARGE GRILLE

REINSTALL FRONT PANEL
1. Grasp the front panel firmly at the center of the
top and bottom of the panel, tilting it forward 5 to
10 degrees from the vertical. See Figure 4.
2. Place the top of the front panel onto the unit,
making sure the top engagement posts have
engaged the slots on the unit. The top edge of the
front panel should be flat against the top of the
unit.
3. Gently lower the front panel onto the chassis,
ensuring the conduit/cord is routed through the
panel notch. Magnetic latches at the bottom of the
front panel will secure the front panel to the unit.

FIGURE 17 — REMOVING OUTDOOR COIL
FROM CONDENSER FAN

GENERAL CLEANING
Maintaining proper performance of 52C,P systems
requires conscientious cleaning and care of components. See Figure 20. Specific components require
periodic cleaning and/or replacement, including the
following:

COMPONENT CLEANING SCHEDULE
Indoor Air Filter
Vent Air Filter
Indoor Coil
Indoor Fan
Outdoor Coil

Monthly
Monthly
Seasonally
Seasonally
Seasonally

CLEANING AND SAFETY
Before starting to clean a unit, read the instructions
thoroughly and gather the necessary tools for the job.
Review all safety information on unit and in literature.

Before cleaning, servicing, performing maintenance,
or removing the chassis from the wall sleeve, disconnect all power to the unit to avoid the possibility of
electrical shock and personal injury. Only trained
and qualified service personnel should perform
installation and service procedures on these units.
Untrained personnel may perform basic maintenance tasks such as cleaning and replacing filters.
Refer to General Disassembly section of this manual
for proper procedures to disconnect power to 52C,P
units.
EXTERIOR
GRILLE
(ACCESSORY)

FRONT
PANEL
(STANDARD)

CHASSIS
(STANDARD)

FIGURE 20 — STANDARD 52C UNIT

WALL SLEEVE
(ACCESSORY)

52C,P
SERIES
■

TOOLS NEEDED

REPLACING THE INDOOR AIR FILTER —
Remove the indoor air filter as detailed in Cleaning
the Indoor Air Filter. If damaged, use a filter replacement with the Carrier Part No. AIR-FILTER-10PK,
available through Carrier Finished Goods and Carrier
Replacement Component Division.
NOTE: Both filters are completely interchangeable.
■ CLEANING THE OUTDOOR AIR VENT FILTER
1. Remove the unit chassis from wall sleeve as
described in the General Disassembly section of
this manual. Refer to Remove the Unit from
the Wall Sleeve section.
2. Swing open vent door. The filter is located directly
behind the vent door. See Figure 22.
3. Once the filter is accessed, it may be cleaned using
either a vacuum cleaner, or a soft bristle brush
and a small amount of mild dish detergent. If
detergent is used, remove detergent residue with
a gentle, clean water stream. Allow the filter to
air dry.

The following list includes the recommended tools,
devices, and cleaning solutions for use in cleaning the
52C,P unit and components.
Vacuum Cleaner with Crevice Tool Attachment,
or Soft Plastic Bristle Brush
Mild Household Detergent
Phillips Head Screwdriver
5/ -in. Nut Driver
16
Flat Head Screw Driver
Needle Nose Pliers, 90° Bend
Lifting Device (or another person for assistance)
Tank Sprayer (Part No. P9021001) or
Trigger Spray Extension Tube (Part No. P9029000)
Compressed Air Tank
Clean Water Supply
Indoor Air Filter Replacement
(Part No. AIR-FILTER-10PK)
Vent Air Filter Replacement (Part No. 52CQ500144)
Condenser Coil Cleaning Solution (Part No. P9020501)
Evaporator Coil Cleaning Solution (Part No. P90221001)
10-in. by 29-in. Piece of Clean Cardboard
3% Solution of Hydrogen Peroxide in Spray Bottle
Clean Cloth
Safety Glasses
Protective Gloves

■

REPLACING THE OUTDOOR AIR VENT FILTER —
If vent filter requires replacement:
1. Open vent door to access vent filter.
2. Remove vent door from hinges.
3. Using a small flat head screwdriver, pry the filter
from the partition.
4. Replace vent filter using Carrier Part No.
52CQ500144.
5. Reverse Steps 1-3 to reattach vent door.

MONTHLY CLEANING
■

AIR FILTERS — The indoor and vent air filters
should be cleaned once per month. Filters that are not
cleaned become clogged and will restrict airflow. This
may lead to major component damage. If a filter
becomes torn, has holes, or other damage, replace it
with a new one. Replacement filters are available
through Carrier Finished Goods and Carrier Replacement Component Division.

■ CHASSIS

Occasional cleaning of the exterior surfaces of the
PTAC unit optimizes the unit’s appearance and
removes particles that may enter the air system. See
Figure 23. Mild detergents clean and reduce electrostatic charges on the plastic components of the PTAC
unit.
Use a clean cloth or brush to gently wipe exterior surfaces. Be careful not to push dirt or other fibers into
the unit’s interior components. Accessible wall sleeve
surfaces should also be wiped clean.

■

CLEANING THE INDOOR AIR FILTER — Two air
filters are located in the unit’s front panel. To remove
each filter simply grasp each filter handle with both
hands and gently pull the filter up and away from the
unit. See Figure 21.

SEASONAL CLEANING
The indoor and outdoor coils should be cleaned at least
once during every season. Refer to ACCESSING
UNIT COMPONENTS section to prepare unit.
■ CLEANING THE INDOOR AND OUTDOOR
COILS

Do not set unit on end to drain water from basepan,
or at any other time. Oil will drain from the compressor sump, which could cause compressor failure.
6. Thoroughly clean the basepan and drain passages
by rinsing with clean water. Be sure all debris is
removed from the drain valve. See Figure 26.
7. Thoroughly clean outdoor fan assembly and all
other mechanical components located in outdoor
coil area. Be sure to remove all dirt and debris.
8. Clean wall sleeve.

Coil fins are sharp and may cut hands. Wear heavy
protective gloves when cleaning coils.

■

CLEANING THE INDOOR FAN AND FAN
SCROLL — Dried debris and build-up on the blower
wheel and fan scroll can reduce the efficiency of the
unit.
1. ACCESS AND CLEAN INDOOR FAN AND
FAN SCROLL
a. Reach behind the indoor coil and vacuum any
loose debris from the condensate drain pan, fan
and other areas accessible to the fan scroll,
being careful to avoid damage to the coil fins.
b. Use mild detergent and a damp cloth to remove
stubborn debris from surfaces around scroll and
fan blades.
2. CLEAN HEATER ASSEMBLY — Use compressed air to blow off any dirt or dust that has
accumulated on the heater coils.
NOTE: Do not direct air at the bi-metal discs on
the temperature limiter switches.

Use only cleaning solutions that meet local codes.
1. Use a vacuum cleaner or soft bristle brush to
remove surface fibers and dirt from the interior
surface of evaporator coil and both surfaces of condenser coil. See Figure 24. It is important to apply
the tool in the same direction of the fins, not
against them. Applying the tool against the fins
may cause damage (fin edges may bend over).
2. With a tank sprayer or a trigger spray extension
tube, spray coil cleaning solution evenly across
the coils, making sure coils are thoroughly saturated. See Figure 25. Refer to instructions on the
cleaning solution containers for best results. Do
not use a high-pressure sprayer.
3. Rinse the coils thoroughly with low-velocity, clean
warm water (less than 200 F).
4. Repeat steps 2 and 3 for each coil surface.
5. Drain water and cleaning solution that may have
collected in the basepan during the cleaning process by carefully tilting the chassis. This allows
excess water to flow out of the overflow notches.

VENT DOOR

FIGURE 21 — LOCATION OF
TWO-PIECE INDOOR FILTER

OUTDOOR
AIR FILTER

FIGURE 22 — LOCATION OF OUTDOOR AIR
VENT FILTER

52C,P
SERIES

FIGURE 23 — PTAC EXTERIOR SURFACES

FIGURE 25 — CLEANING COILS

FIGURE 24 — VACUUMING EVAPORATOR
COIL

DRAIN VALVE

FIGURE 26 — BASEPAN SECTION

COMPRESSOR
pump bearing provides a thrust surface for the shaft
and the rolling piston. Compressed gas is separated
from the suction gas by the vane. Discharge gas pressure and the vane spring keep the vane in contact with
the rolling piston.

A cutaway view of the rotary compressor with key
components labeled is shown in Figure 27. The motor
stator is rigidly attached to the compressor shell. The
rotor is pressed onto the eccentric shaft, which is supported by 2 bearings. Both the discharge valve and discharge muffler are attached to the motor bearing. The

DISCHARGE TUBE

SUCTION INLET
SHELL

STATOR
ECCENTRIC SHAFT
SUCTION MUFFLER/
ACCUMULATOR

ROTOR

MOTOR BEARING
DISCHARGE MUFFLER
DISCHARGE VALVE
CYLINDER

PISTON
VANE

PUMP BEARING
OIL TUBE
MOUNTING PLATE

FIGURE 27 — ROTARY COMPRESSOR COMPONENTS

52C,P
SERIES
BASIC HERMETIC COMPRESSOR
ELECTRICAL MEASUREMENTS

The rotary compression process (Figure 28), starts at
top dead center as shown in (1). Suction gas flows
through the suction inlet and into the cylinder area.
As the shaft rotates through 90 degrees, the rolling
piston moves to position A as shown in (2). The suction
volume is now the area defined by point A and the tip
of the vane. Gas in the remaining volume has been
compressed above suction pressure. After another
90 degrees of shaft rotation, the rolling piston has
moved to position B as shown in (3). Both the compressed gas and suction gas volumes are now equal.
Another 90 degrees of shaft rotation is shown in (4).
Compressed gas has reached a pressure sufficient to
open the discharge valve, and flows from the cylinder
into the compressor shell. After another 90 degrees of
shaft rotation, the entire process begins again. Continuous suction and discharge allows for a smooth compression process.
The rolling piston is not in actual contact with the cylinder wall, vane, or bearing faces. Hydrodynamic sealing prevents leakage from the compressed gas volume
to the suction volume via these paths. Precise control
of machining tolerances, surfaces, finishes, and assembly clearances is critical to achieve high efficiency performance. In addition, the line contact between the
vane tip and the rolling piston requires careful selection and control of materials to provide wear resistance and reliable long-term operation.

There are 2 basic electrical tests for hermetic compressors that will determine the electrical state of the
motor. The first test requires checking the electrical
resistance of each of the electrical motor windings. The
second test requires checking the electrical resistance
of each of the electrical motor windings to ground.
These tests may be accomplished by performing the
following steps:
1. DISCONNECT ALL POWER TO THE UNIT.
2. Remove the unit chassis from the sleeve as
detailed in the UNIT DISASSEMBLY section.
3. Open the control box as detailed in the UNIT
DISASSEMBLY section, then locate, label, and
remove the 3 compressor wires from the following
locations: the RUN wire (BLACK) from the capacitor, the START wire (BLUE) from the capacitor.
The third wire, COMMON wire (YELLOW) may
be connected to one of the following locations: for
PC units the wire is on the indoor thermostat,
for CE, PE Remote Control Units the wire is
on the RC Control Board, for all other CE, PE
Units the wire is located on the rotary selector
switch. For ALL CQ, PQ Units the wire is on the
outdoor frost thermostat.

COMPRESSOR TROUBLESHOOTING
For compressors that are known to be damaged: Remove refrigerant prior to disconnecting
compressor wires. Damaged hermetic compressor
terminals may become loose and eject from the compressor. Wear safety glasses and keep your face
away from the area above the terminals when
removing compressor wires.

Refer to Figure 29 for a basic compressor troubleshooting chart.

4. Perform a shorted/open windings test to measure
the resistance between the windings of the compressor motor. Use a volt-ohmmeter set to the
lowest ohm reading level then read and record the
resistance between the RUN and START, START
and COMMON, and RUN and COMMON wires.
See Figure 30. The typical resistance readings will
be about 4, 3, and 1 ohms respectively. The
smaller values should add to equal the larger
value. If this is not true then the compressor is
likely shorted winding to winding.
NOTE: The rotary compressor has the compressor
overload located under the terminal cover. If the overload is open it can show ohm readings that are infinite.
The unit should be off for at least an hour to give this
overload time to reset if it is open.

FIGURE 28 — ROTARY COMPRESSOR
COMPRESSION PROCESS

POSSIBLE CAUSE

COILS/FILTERS DIRTY OR PLUGGED
AIR OR NONCONDENSABLE GASES
IN SYSTEM
SYSTEM REFRIGERANT OVERCHARGED
DISCHARGE LINE RESTRICTED
CAPILLARY TUBE OR STRAINER
RESTRICTED OR PLUGGED
FAN BLADE OR MOTOR DEFECTIVE
FAN BLADE OR BLOWER WHEEL STUCK
SYSTEM REFRIGERANT UNDERCHARGED
EVAPORATOR AIRFLOW RECIRCULATION
UNIT OVERSIZED FOR APPLICATION
COMPRESSOR REQUIRES START ASSIST
NO POWER TO UNIT
LOW VOLTAGE TO UNIT
OVERLOAD PROTECTOR OPEN
OVERLOAD PROTECTOR INCORRECT
OR DEFECTIVE
CAPACITOR INCORRECT OR DEFECTIVE
THERMOSTAT CONTACTS ARE OPEN
THERMOSTAT IS SET TOO HIGH OR LOW
SELECTOR SWITCH IS OPEN
OR DEFECTIVE
WIRING IS INCORRECT OR DEFECTIVE
SYSTEM PRESSURES NOT EQUALIZED
COMPRESSOR MOTOR OR
MECHANISM DEFECTIVE
COMPRESSOR GROUNDED

Compressor
Starts and
Runs But
Cycles On the
Overload
X

Compressor
Starts After
Cycling the
Overload
Several Times

X
X

SYMPTOM
Compressor
Will Not
Start. It Hums
and Cycles On
the Overload

Compressor
Will Not Start
and Makes No
Noise

Compressor
Cycles Off
(Not On
Overload)

X
X

X
X
X

X
X
X
X
X
X

X
X

X
X
X
X

X
X

FIGURE 29 — BASIC COMPRESSOR TROUBLESHOOTING GUIDE
5. Next, perform a grounded windings test to test
the resistance individually of each wire to the
shell of the compressor. The paint on the compressor can prevent good contact between the probe
and the metal. The paint should be removed from
a small section of the shell of the compressor to
ensure good contact by the meter probe. The voltohmmeter should be set to at least the 100X ohm
level. The measured resistance between each wire
and ground should be infinite or O.L. on the
readout. If there is measurable resistance one of
the windings is likely shorted to ground. See
Figure 31.
6. A compressor that has a winding to winding short
or a winding to compressor shell short is electrically failed and needs to be replaced. See the
Compressor Replacement section for details.

Consider the following safety issues before
beginning:
• New and unfamiliar tasks should be performed
under the supervision of an experienced service
technician.
• Personal protective equipment, such as work gloves
and safety glasses, should be worn.
• The floor around the work area should be clean and
free of debris.
• Make sure tools are the correct tools for the job and
that they are working properly and in good condition.
• Never replace a blown fuse without correcting the
cause of the original failure. If thermally operated
circuit breakers or overloads are tripping, make
sure the trip is not due to excessively high temperatures or loose connections.
• When brazing suction and discharge lines, cool the
lines with a damp, clean cloth to prevent injury.
• Oil may be present in the compressor accumulator
and interconnecting tubing. Use caution when
removing tubing.

COMPRESSOR REPLACEMENT
Before working on the compressor, read the instructions thoroughly and gather the necessary tools for the
job. Review all safety information on unit and in literature. Always turn off all power to unit to avoid the
possibility of electrical shock.

52C,P
SERIES
■

REMOVING THE COMPRESSOR — Follow the
steps below to remove the compressor:
1. Disconnect all power to unit.
2. Remove unit from wall sleeve as detailed in the
UNIT DISASSEMBLY section. The unit weighs
up to 150 pounds. Seek assistance or use a lifting
device when removing unit from wall sleeve.
3. If the unit is a heat pump: Disconnect the wire
plug on the reversing valve solenoid and carefully
remove the outdoor thermostat capillary from the
outdoor coil. See Figure 32.
4. Attach the piercing valve to the suction side process tube below the crimps. Attach Carrier
TOTALTEST® kit (Part No. TT1-001), to the
piercing valve to verify acidity of the system. After
verifying the system acidity, remove the refrigerant using a certified refrigerant recovery system.
5. When all the refrigerant has been recovered,
remove the terminal cover from the compressor
with a nut driver. Disconnect the 3 wires from the
compressor and label the location of each. Once
the wires are labeled, replace the terminal cover
to protect the compressor terminals.
6. Remove the air system components by following
the procedure detailed in the ACCESSING UNIT
COMPONENTS section.
7. Remove the piercing valve and cut the crimped
portion of both process tubes off with a small tubing cutter. Braze an access valve on each process
tube. Using a torch, disconnect the suction and
discharge tubes from the compressor connections.
8. Remove the compressor mounting bolts, and
remove the compressor.

FIGURE 30 — SHORTED/OPEN WINDINGS TEST

FIGURE 31 — GROUNDED WINDINGS TEST

For compressors that are known to be damaged: Remove refrigerant prior to disconnecting
compressor wires. Damaged hermetic compressor
terminals may become loose and eject from the compressor. Wear safety glasses and keep your face
away from the area above the terminals when
removing compressor wires.

The compressor may still be hot from the brazing
process.
IMPORTANT: Any time the compressor is
replaced, the strainer and capillary tubes must
be removed and replaced also.

■ TOOLS NEEDED — The following list includes the
recommended tools and devices for removing and
replacing the compressor.
1/ -in. and 3/ -in. Tube
2
8
1/ -in. Nut Driver
2
5/ -in. Nut Driver
16

9. For all units: Remove and replace the strainer
and capillary tubes from the system. See Figure 32
for strainer and capillary tube location.
10. For Heat/Cool Units: Use an in-line filter drier
(P/N P504-80845). The filter drier can be installed
in any location in suction line. See Figure 33A for
general installation location.
For Heat Pump Units: Use an in-line filter drier
(P/N P504-80845) and install between the
reversing valve and the compressor accumulator. There are several suction tube configurations and the in-line filter drier will be field piped
and brazed into the suction tube for your unit. See
Figure 33B for a general installation location.
11. Remove the grommets from the existing compressor and install them onto the new compressor.

Benders

Flat Head Screwdriver
Piercing Valve
2 Parker Access Valves (Part No. AVUSE-5)
Pinch Off Tool
Filter Drier — All Units (Part No. P504-80845)
Carrier TOTALTEST Kit (Part No. TT1-001)
Totalclaim System
Charging Cylinder or an Electronic Scale
Refrigerant-22
Tubing Cutter
Torch
Nitrogen Cylinder with Regulator
Strainers
Capillary Tubes

12. Install the new compressor and the new capillary
assembly (the correct capillary and strainer may
be obtained from Carrier RCD), into the unit.
13. Leak check the unit with 150 psi of nitrogen
pressure.
14. For 52C,P units, the system should be evacuated
from the high side to the low side to a minimum
of 200 microns of mercury. This evacuation
removes residual moisture from the system prior
to charging.
15. For Heat Pump Units: Recharge unit to the
nameplate refrigerant charge using a charging
cylinder.
16. Pinch off each access valve on the process tubes,
in 2 places, using a pinch off tool such as Imperial
tool #105-FF or Robinair Tool #12294. Release any
refrigerant pressure trapped in the access valve
by depressing the valve core, then confirm that no
R-22 is leaking past the pinch off tool location. Cut
the access valve stem of the process tube above
the top crimp and braze the top of each process
tube to ensure the system is sealed, (leave the
pinch off tool in place until after the brazing process is complete).
17. Reassemble the unit by reversing steps 1-9.
18. Connect the compressor wires and energize the
unit to verify operation.

FIGURE 32 — STRAINER AND
CAPILLARY TUBE LOCATION

■

REFRIGERANT CHARGING — Every mechanical
refrigeration system that is opened for servicing must
be accurately charged before it is returned to service.
Run the compressor ONLY after charging the system
with refrigerant.
IMPORTANT: The compressor should never be
operated without refrigerant!

IN-LINE
FILTER DRIER
COMPRESSOR

It is important to remember that recovered and/or
recycled refrigerant may only be recharged into the
system from which it was initially recovered, or
another one owned by the same customer. Charge
level is important. Charge units only as recommended
by manufacturer.

FIGURE 33A — IN-LINE FILTER DRIER —
GENERAL INSTALLATION LOCATION
FOR HEAT/COOL UNIT

IN-LINE
FILTER DRIER

COMPRESSOR

FIGURE 33B — IN-LINE FILTER DRIER —
GENERAL INSTALLATION LOCATION
FOR HEAT PUMP UNIT

52C,P
SERIES
HEATERS
COMMON CAUSES OF
HEATER FAILURE

The heater in 52C,P units is located directly behind
the evaporator coil. The heater assembly includes the
heater (2.3 kW, 3.4 kW or 5 kW), a primary limit
switch, and a secondary limit switch. See Figure 34.
The primary and secondary limit switches are safety
switches that regulate heater operation. The primary
limit switch disables current to the heater when the
temperature exceeds the setting on the switch.
For example, a 3.4 kW heater may have a primary
limit switch setting of 150 F. If the temperature at the
switch exceeds 150 F, the primary limit switch will
electrically open and shut off power to the heater.
Once the temperature drops below 110 F, the primary
limit switch will automatically reset.
The secondary limit switch works in the same manner
as the primary limit switch, except it is a one time
switch and has a slightly higher temperature setting.
Once this switch is thermally opened, it must be
replaced. Together the primary and secondary
switches help maintain safe temperature limits for
unit operation.

Heater failure may result from broken heater coils,
primary limit switch failure, or an open secondary
limit switch. These conditions are generally caused by
low or no airflow.

HEATER REMOVAL
Before working on the heater, read the instructions
thoroughly and gather the necessary tools for the job.
Review all safety information on the unit and in the
product literature.

Before performing any cleaning, servicing, or maintenance to the unit, Disconnect All Power to avoid
the possibility of electric shock and personal injury.
The manufacturer reserves the right to discontinue, or
change at any time, specifications or designs without
notice and without incurring obligations.
Consider the following safety issues:
• Prior to performing any service or maintenance on
electrical equipment you must Disconnect All
Power.
• New and unfamiliar tasks should be performed
under the supervision of an experienced service
technician.
• Personal protective equipment, such as safety
glasses and work gloves, should be worn.
• The floor around the work area should be clean and
free of debris.
• Make sure tools are the correct tools for the job,
and that they are working properly and in good
condition.

FIGURE 34 — LIMIT SWITCH LOCATION

■ TOOLS NEEDED — The following list includes recommended tools and devices for working on the heater
section of 52C,P units.

Coil resistance must also be checked to verify the
heater is operating correctly. The resistance of the
heater coils must meet approximate levels for the
heater to perform at its optimum efficiency. See
Figure 36 for approximate resistance for heaters at
75 F. Before checking the heater coil resistance, be
sure all power to unit is off.
To check resistance, set the volt-ohmmeter selector
switch to the lowest ohms value. Next connect the voltohmmeter leads to each side of the heater coil at the
studs that hold the limit switches in place. Incorrect
readings can be obtained if the wires are not removed
from the limit switches on the heater assembly. If the
resistive reading is infinite or zero, the heater is failed
and replacement is necessary. Reinstall the heater
assembly.

Phillips Head Screw Driver
Needle Nose Pliers
Volt-ohmmeter
Nut Driver 5/16-in.

Perform the following steps to remove the Heater
Assembly.
1. DISCONNECT ALL POWER TO UNIT.
2. Remove heater by following instructions in
ACCESSING UNIT COMPONENTS section.
After the heater is removed, examine the heater
as follows to determine if it is operational:
Perform a visual inspection. The heater coil should be
free of breaks. If there are any breaks in the coil,
replacement of the heater assembly is necessary. See
Figure 35.

HEATER SIZE
2.3 kW
3.4 kW
5.0 kW

WATTS

VOLTS

2300
2300
3400
3400
5000
5000

230
265
230
265
230
265

ACCEPTABLE RESISTANCE
(Ohms)
20-23
28-31
13-16
19-21
9-11
13-15

FIGURE 36 — ACCEPTABLE HEATER
RESISTANCE VALUES

FIGURE 35 — HEATER COIL (Removed)

52C,P
SERIES
OPERATING CONTROLS
UNIT-MOUNTED CONTROLS

The 52C,P heat pump unit contains all the components of the heat/cool and cooling only unit, and the
following additional ones: the outdoor frost thermostat
and the reversing valve. The outdoor frost thermostat
prevents operation of the unit in the heat pump mode
when the outdoor coil temperature drops below 20 F,
or at about 35 F outdoor ambient temperature. The
unit automatically engages the electric heat strip and
disables the compressor under these conditions.
The outdoor frost thermostat has a manual override to
place the unit in electric heat mode operation only. The
override switch is located behind the front panel on
the front side of the unit control box door.

The controls and components used in the 52C,P cooling only or heat/cool units are as follows: the selector switch, the indoor thermostat, the dual capacitor,
the temperature limiter, the vent lever, and the fan
cycle switch. See Figure 37.
The selector switch is used to determine the mode of
operation: heat, cool, fan, or off. The indoor thermostat
controls the room ambient temperature and cycles the
heater or the compressor based on the selector switch
setting. The dual capacitor aids in the start-up of the
compressor and the fan motor. The temperature limiter
is integrated into the control box top cover located
under front panel. It is a mechanical device that
restricts the amount of rotation of the thermostat. The
temperature limiter device may be adjusted by moving
the plastic temperature selector tabs to another temperature location on the control box. The vent lever is
located on the front left side of the chassis. It is a slide
mechanism that opens and closes the vent door. The
vent control may be accessed by removing the front
panel of the unit. The fan cycle switch is used to provide
2 options of fan control. The first option, CON, causes
the fan to run continuously. The second option, CYC,
causes the fan to cycle on with the compressor or electric heater and off when the thermostat is satisfied.
INDOOR
THERMOSTAT

The reversing valve allows for operation in reverse cycle
heat pump mode. The valve is located in the piping system and is controlled by the reversing valve solenoid
coil. The coil is energized only during the heating mode.

SELECT0R
SWITCH

75
80

65
90

IMPORTANT: Placing the override switch to electric heat mode operation will disable the compressor for ALL heating or cooling operations (for all
units except RC units). Placing the override switch
to electric heat mode operation on RC units will
only disable the compressor in heating mode.

TEMPERATURE
LIMITER
CON

FAN CYCLE
SWITCH

CYC

OUTDOOR FROST
THERMOSTAT
(HEAT PUMP
UNITS ONLY)

FIGURE 37 — 52C,P OPERATING CONTROLS

WALL-MOUNTED THERMOSTAT
CONTROLS
For 52C,P wall thermostat control (RC, RP)
units, all controls are located on the wall-mounted
thermostat except the vent lever and outdoor thermostat. Remote control is a factory or field-installed
option. There are 3 styles of thermostats qualified for
use with 52C,P series Remote Control units. See Figures 38-40. On remote control units, the fan cycle function is located on the wall thermostat. The rocker
switch on the control box door is used to set fan speed
to high or low. Factory default is low speed.
See Figures 41-43 for thermostat wiring.
A field conversion kit is available to convert an AA
model (standard unit-mounted controls) to an RC
model (wall-mounted controls).

TYPICAL
WALL
THERMOSTAT

TERMINAL
BLOCK
TERMINAL
R
G
Y
W
O
C

IMPORTANT: No conversion kit is available to
convert from an RC model back to an AA model.

DESIGNATION
24 VAC
Fan
Compressor
Electric Heat
Reversing Valve
Common

NOTES:
1. Use terminal “O” for heat pump connection only.
2. See table at left for terminal descriptions.
3. Common wire “C” is typically used only
for digital thermostats.
4. Power stealing is NOT allowed. There
must always be a hard common connection between unit and digital thermostat.

FIGURE 41 — WIRING CONNECTIONS

REMOTE THERMOSTAT
TROUBLESHOOTING
Thermostat display is blank:
Check to make sure there is 24 VAC to the thermostat
(measure across terminals R and C at the thermostat).
If there is 24 VAC at the thermostat, check connections at the thermostat terminal block. If connections
are good and there is 24 VAC with no display, the thermostat should be replaced.
Thermostat display is working but unit is not
heating or cooling:
At the RC terminal block on the unit, measure the control inputs coming from the thermostat. (Place one of
the meter leads on C and use the other to check the
voltage at each of the terminals.)

FIGURE 38 — NON-PROGRAMMABLE
THERMOSTAT

24
24

TERMINAL
METER READINGS (VAC)
O (For
G
Y
W
HP Only)
24
0
0
0
24
24
0
24

24
24

MODE
R
Fan Only
Cooling
Heating
Heat Pump Unit
Heat/Cool Unit

24
0

0/24*
24

0
0

*24 VAC supplied if thermostat is in 2nd stage heating demand (large
difference between room temperature and setpoint).

FIGURE 39 — MANUAL THERMOSTAT

NOTE: For heat pump units, the Outdoor Frost Thermostat (OFT) will
determine, based on outdoor temperature, whether to bring on the compressor or electric heat in the Heating mode.

FIGURE 42 — THERMOSTAT TROUBLESHOOTING
If the inputs are not correct, then the thermostat is not
making a call for the mode requested. This could be
because the thermostat is in a unit protection mode,
not set up properly, miswired, has a broken wire, or it
may have failed.
FIGURE 40 — PROGRAMMABLE THERMOSTAT

52C,P
SERIES
MASTER
PTAC

T’STAT

R
UNIT 1

Y
W
G
O
C

R
UNIT 2

Y
W
G
O
C

R
UNIT 3

Y
W

NOTES:
1. Do not daisy chain R (24 VAC).
2. Maximum of 4 PTAC units can be connected
to one single wall thermostat.

G
O
C

All units must be connected to same ground source.
To accomplish this, be sure to connect all units back
to the same breaker box.
FIGURE 43 — TYPICAL WIRING FOR MULTIPLE 52C PTAC UNITS CONNECTED
TO ONE WALL THERMOSTAT

DESCRIPTION OF SELECTOR SWITCH
SETTINGS (Figure 44)

NON-USER ADJUSTABLE CONTROLS
■

■ OFF MODE — The OFF position terminates unit
operation.

OUTSIDE OR VENT AIR — Slide the vent lever to
the fully open position for outside air or fully closed
position for vented air.

■

FAN CYCLE — The fan cycle switch allows the fan
to operate in 2 modes:
CON — Fan runs continuously, circulating air even
when the temperature setting has been satisfied. This
helps to maintain the room temperature closer to the
thermostat setting.
CYC —Fan cycles on and off with the compressor
during heating or cooling. Fan stops when the temperature setting is satisfied. This results in longer unit
off-time and slightly larger variations in room temperature and humidity.

FAN ONLY MODE — Use fan only position for air
circulation without heating or cooling. Fan runs at
high speed.
■

HIGH HEAT OR HIGH COOL MODE — Position
selector and temperature control knobs to desired comfort level. This function provides maximum heating or
cooling, and is recommended to raise or lower the room
temperature quickly.

■

LOW HEAT OR LOW COOL MODE — Position
selector and temperature control knobs to desired comfort level. This function provides minimum heating
or cooling with maximum dehumidification during
cooling. This setting also allows for very quiet fan
operation.

■

OUTDOOR THERMOSTAT (52CQ, PQ Units Only)
— The outdoor thermostat has 2 operating modes. The
heat pump mode (selector screw set fully clockwise),
allows the unit to operate normally in the reverse cycle
mode. The electric heat mode (selector screw set fully
counterclockwise), disables all compressor operating
modes, both heating and cooling for units with
mounted controls. For wall thermostat controlled models the compressor is only disabled in heating and still
allowed to run in cooling.

■

FINDING TEMPERATURE SETTING FOR COMFORT LEVEL — Set temperature knob in the middle.
Select High Heat, Low Heat or Cool position and allow
unit to run for 15 to 30 minutes. If room is not comfortable, turn knob setting slowly to change setting. When
room is comfortable, keep control knob at that
position.

TYPICAL 52C UNIT CONTROLS

TYPICAL 52C UNIT WITH
WALL THERMOSTAT CONTROLS (Blank Plate)

FIGURE 44 — TYPICAL CONTROL PANEL (52C Unit Shown)

52C,P
SERIES
Cooling (High) — With the selector switch set to high
cool, contacts L1 to IT3 and FCS to HI are made.
Heating (Low) — With the selector switch set to low
heat contacts L1 to IT1, FCS to LO and L2 to HTR are
made.
Heating (High) — With the selector switch set to high
heat contacts L1 to IT1, FCS to HI, and L2 to HTR are
made.
Defrost Cycle — When heat pump unit is operating in
reverse cycle, the outdoor coil may begin to frost. As
frost accumulates on the outdoor coil the unit may
switch into defrost mode. The defrost mode is activated when the outdoor frost thermostat sensor
detects a temperature below 20 F on the coil. At this
point, the thermostat deenergizes the compressor and
activates the electric heat. The unit will remain in
electric heat mode until the outdoor thermostat senses
35 F coil temperature. The defrost mode is a passive
operation and may take some time before the coil
defrosts.

SEQUENCE OF OPERATION
■

HEAT/COOL UNITS (Figure 45)
Fan Mode — With the selector switch set to FAN contacts L1 to HI and FCS1 to LS are made.
Cooling (Low) — With the selector switch set to low
speed cooling contacts FCS2 to LO, COMP to FCS1,
and COMP to IT3 are made.
Cooling (High) — With the selector switch set to high
speed cool contacts FCS2 to HI, COMP to FCS1, and
COMP to IT3 are made.
Heating (Low) — With the selector switch set to low
speed heat contacts FCS2 to LO, IT1 to LS, L2 to HTR,
and FCS1 to LS are made.
Heating (High) — With the selector switch set to high
speed heat contacts FCS2 to HI, IT1 to LS, L2 to HTR,
and FCS1 to LS are made.
SWITCH
POSITION
OFF
FAN
LO HEAT
HI HEAT
LO COOL
HI COOL

CONTACTS MADE
NONE
L1 TO HI, FCS1 TO LS
FCS2 TO LO, IT1 TO LS, L2 TO HTR, FCS1 TO LS
FCS2 TO HI, IT1 TO LS, L2 TO HTR, FCS1 TO LS
FCS2 TO LO, COMP TO FCS1, COMP TO IT3
FCS2 TO HI, COMP TO FCS1, COMP TO IT3

SWITCH
POSITION
OFF
FAN
LO HEAT
HI HEAT
LO COOL
HI COOL

FIGURE 45 — SELECTOR SWITCH CONTACTS,
ALL 52CE, PE ELECTRIC HEAT/COOL UNITS
COOLING ONLY UNITS (Figure 46)
Fan Mode (Low) — With the selector switch set to FAN
contact L1 to LO is made.
Fan Mode (High) — With the selector switch set to
FAN contact L1 to HI is made.
Cooling (Low) — With the selector switch set to low
speed cooling contacts FCS to LO and L1 to IT3 are
made.
Cooling (High) — With the selector switch set to high
speed cool contacts FCS to HI, L1 to IT3 are made.

OFF
FAN LO
FAN HI
LO COOL
HI COOL

NONE
L1 TO HI
L1 TO IT1, FCS TO LO, L2 TO HTR
L1 TO IT1, FCS TO HI, L2 TO HTR
L1 TO IT3, FCS TO LO
L1 TO IT3, FCS TO HI

FIGURE 47 — SELECTOR SWITCH CONTACT,
ALL 52CQ, PQ HEAT PUMP UNITS

■

SWITCH
POSITION

CONTACTS MADE

COMPONENT OPERATION AND
TROUBLESHOOTING
■

TOOLS NEEDED
Volt-Ohmmeter
Flat and Phillips Screw Drivers
5/16-in. Nut Driver
Side Cutting Pliers

CONTACTS MADE
NONE
L1 TO LO
L1 TO HI
L1 TO IT3, FCS TO LO
L1 TO IT3, FCS TO HI

Before cleaning, servicing, performing maintenance
or removing the chassis from the wall sleeve, disconnect all power to the unit to avoid the possibility of
electrical shock and personal injury. Only trained
and qualified service personnel should perform
installation and service procedures on these units.
Untrained personnel may perform basic maintenance tasks such as cleaning and replacing filters.
Refer to UNIT DISASSEMBLY section of this manual for proper procedures to disconnect power to
52C,P units.

FIGURE 46 — SELECTOR SWITCH CONTACTS,
ALL 52CE, PE COOLING ONLY UNITS
■

HEAT PUMP UNITS (Figure 47)
Fan Mode — With the selector switch set to fan contact
L1 to HI is made.
Cooling (Low) — With the selector switch set to low
cool contacts L1 to IT3 and FCS to LO are made.

The Manufacturer reserves the right to discontinue, or
change at any time, specifications or designs without
notice and without incurring obligations.

3. Place one of the leads of the continuity tester on
the terminal marked 2, and the other lead on
either the terminal marked 1 or the terminal
marked 3.
4. Adjust the thermostat up or down to verify the
contacts of the switch open and close. When verifying continuity of a closed switch, the ohm reading should be 0 ohms. An open switch will show
OL on the meter.
5. When testing is complete, reconnect the leads.

Consider the following safety issues:
• Prior to performing any service or maintenance on
electrical equipment you must Disconnect All
Power.
• New and unfamiliar tasks should be performed
under the supervision of an experienced service
technician.
• Personal protective equipment, such as safety
glasses and work gloves, should be worn.
• The floor around the work area should be clean and
free of debris.
• Make sure tools are the correct tools for job, and
that they are working properly and in good
condition.
• The 52C,P unit may weigh up to 150 pounds. Use a
lifting device or ask for assistance if the unit must
be moved.

■

INDOOR THERMOSTAT (Heat Pump Units)
(Figure 49) — The heat pump indoor thermostat uses a
two-stage switch for the heating mode. The first stage
engages the compressor and reversing valve, and the
unit operates in normal heat pump mode. The indoor
thermostat maintains the selected temperature by
cycling the compressor on and off in cooling mode. In
the heating mode, the indoor thermostat will cycle the
compressor or the heater, depending on the difference
between the actual room temperature and the thermostat temperature setting.
When the room temperature is more than 4 F cooler
than the indoor thermostat setting, the second heating
stage of the indoor thermostat engages the electric
heat strip. This design feature allows the user to rapidly warm the room with the electric heat strip by
turning the thermostat to its highest setting. When
room temperatures approach the desired temperature,
the user may adjust the thermostat to a personal
comfort setting, which allows for normal heat pump
operation.
NOTE: For outdoor coil temperatures below approximately 20 F, the outdoor frost thermostat prevents
heat pump mode operation and immediately engages
the electric heat strip upon a call for heating. The electric heat strip is NEVER energized at the same time
as the compressor.
To verify operation of the heat pump indoor thermostat switch, a continuity test may be performed as
follows:
1. Turn off unit power as described in UNIT
DISASSEMBLY section.
2. Remove wire leads from thermostat. Note their
locations to ease re-assembly.
3. To test stage A, place one lead of the continuity
tester on the terminal marked 2, and the other
lead on either the terminal marked 1 or the terminal marked 3.
4. Adjust the thermostat up or down to verify the
contacts of the switch open and close. When verifying continuity of the closed switch, the reading
on the meter should be 0 ohms. An open switch
will show OL on the meter.
5. To test stage B contacts, place one lead of the continuity tester on contact 5 and the other lead on
either contact 4 or contact 6.
6. Adjust the thermostat up or down to verify the
contacts of the switch open and close as in Step 4.
7. When testing is complete, reconnect the leads.

■ INDOOR THERMOSTAT (Heat/Cool and Cool Only
Units) (Figure 48) — The thermostat maintains the
selected temperature by cycling the compressor on and
off during cooling operation and the electric heater
during heating operation. The thermostat DOES
NOT switch from heating to cooling, or cooling
to heating. If the switch is in the CYCLE position,
then the fan will be cycled off when the thermostat
satisfies.
To verify the operation of the thermostat switch, a continuity test may be performed as follows:
1. Turn off unit power as described in UNIT
DISASSEMBLY section.
2. Remove wire leads from thermostat. Note their
locations to ease re-assembly.

FIGURE 48 — INDOOR THERMOSTAT (IT)
CONTACTS, ALL 52CE, PE MODELS
LEGEND (Figures 48-50)
COMP
HTR
IT
OFT
OL
PLS
SLS

—
—
—
—
—
—
—

Compressor
Heater
Indoor Thermostat
Outdoor Frost Thermostat
Overload
Primary Limit Switch
Secondary Limit Switch

52C,P
SERIES
1

To verify the OFT is operational, a continuity test may
be performed as follows:
1. Turn off unit power as described in UNIT
DISASSEMBLY section.
2. Remove the leads from the OFT. Note their locations to ease re-assembly.
3. Connect the continuity tester to the switch terminals marked 1 and 2.
4. Rotate the override switch to the electric heat setting and verify that there is continuity between
terminals 1 and 2.
5. To check the other contacts, move the lead on terminal 1 to terminal 3. Rotate the override switch
to the heat pump setting. There should now be
continuity between terminals 2 and 3.
6. Once the test is complete, reconnect the leads.

BLK

2
3

ORN

BLU
GRY

5
6

BRN

FIGURE 49 — INDOOR THERMOSTAT (IT)
CONTACTS, ALL 52CQ, PQ MODELS
■

OUTDOOR FROST THERMOSTAT (Heat Pump
Units) (Figure 50A and 50B) — The Outdoor Frost
Thermostat (OFT) is a thermostat that uses a singlepole switch with a manual override selector. The thermostat switches between electric heat and compressor
operation when the temperature of the outdoor coil
falls below 20 F or rises above 35 F. Switching the
override selector to electric heat disables the reverse
cycle operation of the thermostat and is manually
switched to electric heat operation.

■ CAPACITOR — The 52C,P units use a dual
capacitor. One part of the capacitor is used with the
fan motor. The other part of the capacitor is used by
the compressor.
Run circuits on single-phase compressor motors use
capacitors which dramatically affect the motor operation. Run capacitors are connected to the motor circuit
at all times.
To evaluate the capacitor, perform a visual check first.
A shorted capacitor may give a visual indication of its
failure. For example, the pop-out hole at the top of a
start capacitor may bulge or blow out. A run capacitor
may bulge or leak. In these instances, the capacitor
must be replaced with one recommended by the manufacturer. If there are no visual signs of capacitor failure, testing of the capacitor resistance may be done
with a volt-ohmmeter as detailed below:
1. Turn off unit power as described in UNIT
DISASSEMBLY section but do not unplug the
service cord; it will supply ground connection for
the unit chassis. Check to ensure power is off
and LOCKED OUT.
2. Connect one lead of a 20,000 ohm, 2-watt resistor
to the center group of terminals on the dual capacitor. Attach the other lead from the resistor to an
unpainted metal section of the unit chassis. This
allows that section of the dual capacitor to discharge. Repeat this process between the other
group of terminals.

FIGURE 50A — OUTDOOR FROST THERMOSTAT
(OFT) CONTACTS, ALL 52CQ, PQ UNITS WITH
MOUNTED CONTROLS

Capacitors are capable of holding charge similar to a
battery and may cause an electrical shock.
3. Locate and disconnect the wires from the start
and/or run capacitor to isolate them from the
remainder of the circuit. Refer to the unit wiring
diagram if you need assistance locating wires.
4. Perform capacitor test. Set up the volt-ohmmeter
to measure resistance by connecting terminals C
to FAN and C to HERM on the meter. See
Figure 51.

FIGURE 50B — OUTDOOR FROST THERMOSTAT
(OFT) CONTACTS, ALL 52CQ, PQ UNITS WITH
WALL THERMOSTAT CONTROL

7. Remove the 2 screws mounting the thermostat to
the control box. Route thermostat bulb and capillary out of control box.
8. Remove thermostat.
9. Reverse Steps 1-8 to reinstall.
■

OUTDOOR FROST THERMOSTAT (Heat Pump
Units) — To remove the outdoor frost thermostat
(OFT), perform the following steps:
1. Turn off unit power as described in UNIT
DISASSEMBLY section.
2. Remove front panel.
3. Remove the 2 screws mounting the thermostat to
the bottom of the control box. See Figure 53.

FIGURE 51 — CAPACITOR TEST
5. The reading on the meter should first indicate
zero, or a low resistance, then slowly rise toward
infinity or some high value or measurable resistance. This indicates the capacitor is most likely
good. If the reading goes to zero or a low resistance and stays there, the capacitor is likely
shorted and needs replacement. If the reading
immediately indicates infinity, the capacitor is
likely open and must be replaced.
6. Replace the capacitor if failed and rewire according to the WIRING SCHEMATICS located in the
control box of the unit.
■

FAN CYCLE SWITCH — The fan cycle switch has
2 operating modes, continuous (CON) and cycle (CYC).
To verify the fan cycle switch is operational, a continuity test may be performed as follows:
1. Turn off unit power as described in UNIT
DISASSEMBLY section.
2. Label and remove the leads connected to fan cycle
switch. See Figure 52.
3. Connect the volt-ohmmeter for 1X ohms and check
for continuity from terminal 2 to 1 then change
the switch position and check for continuity from
terminal 2 to 3.
4. Once test is complete, reconnect the leads.

FIGURE 52 — FAN CYCLE SWITCH (3 Terminal)
SELECT0R
SWITCH

75
80

65
90

TEMPERATURE
CONTROL
STANDOFF
PINS
FAN CYCLE
SWITCH

CON
CYC

ELECTRICAL COMPONENTS
REMOVAL AND REPLACEMENT
■

INDOOR THERMOSTAT — To remove the indoor
thermostat, perform the following steps:
1. Turn off unit power as described in UNIT
DISASSEMBLY section.
2. Remove front panel.
3. Remove thermostat knob to expose 2 Phillips head
mounting screws.
4. Open the control box as described in the UNIT
DISASSEMBLY section of this manual.
5. Carefully remove the thermostat bulb from the
clip by gently pressing it down and out of the clip.
6. Remove the leads from the indoor thermostat.
Note the wire locations to ease re-assembly.

OFT
MOUNTING
SCREWS

OUTDOOR FROST
THERMOSTAT
(HEAT PUMP
UNITS ONLY)

FIGURE 53 — 52C,P OPERATING CONTROLS

52C,P
SERIES
■

4. Remove the thermostat capillary from the outdoor
coil and clip any wire ties holding the capillary in
place.
5. Disconnect the wires and carefully remove the
thermostat and capillary from the unit, noting
location of wires for easy re-assembly.
6. Reverse Steps 1-5 to reinstall.

SELECTOR SWITCH — To remove the selector
switch from the unit, perform the following steps:
1. Turn off unit power as described in UNIT
DISASSEMBLY section.
2. Remove selector switch knob. See Figure 53.
3. Open control box as described in the UNIT
DISASSEMBLY section of this manual.
4. Remove all the wires to the selector switch. Label
wires to simplify re-assembly. See Figure 54.
5. Remove the 2 screws mounting the switch and
remove switch.
6. Reverse Steps 1-5 to reinstall.

■ CAPACITOR — To remove the capacitor, perform
the following steps:
1. Turn off unit power as described in UNIT
DISASSEMBLY section.
2. Open the control box as detailed in the UNIT
DISASSEMBLY section of this manual.
3. Properly discharge the capacitor as described in
the Capacitor section under Component Operation and Troubleshooting.
4. Remove the leads to the capacitor. Note the wire
locations to ease re-assembly.
5. Remove the screw holding the capacitor.
6. Remove capacitor.
7. Reverse Steps 1-6 to reinstall.

CAPACITOR

OUTDOOR FROST
THERMOSTAT

■

FAN CYCLE SWITCH — The fan cycle switch is
located on the front of the control box. To remove the
fan cycle switch, perform the following steps:
1. Turn off unit power as described in UNIT
DISASSEMBLY section.
2. Open the control box as described in UNIT
DISASSEMBLY section of this manual.
3. Remove the 3 wires from the fan cycle switch. See
Figure 54 for location, noting location of wires for
re-assembly.
4. Push the snaps of the switch housing toward the
switch with a pair of pliers or small screwdriver.
Gently push the switch out of the housing.
5. Reverse Steps 1-4 to reinstall.

POWER CORD
RIBBED WIRE (L2)
TO CAPACITOR (C)

GROUND SCREW

POWER CORD
PLAIN WIRE (L1)
TO ROTARY SWITCH

FAN CYCLE
SWITCH
INDOOR
THERMOSTAT

SELECTOR
SWITCH

FIGURE 54 — COMPONENT LOCATIONS
IN OPEN CONTROL BOX

FAN MOTOR
The fan motor is a permanent split capacitor (PSC)
type motor. This motor is common in air-conditioning
system applications. A PSC motor does not require the
use of a relay and always has a run capacitor connected between the run and start windings of the
motor. See Figure 55.
The 52C,P series fan motor has a motor shaft extended
through both ends. It powers both the indoor and the
outdoor fans. It has permanently sealed bearings that
require no lubrication. There are many different fan
motor models, but they typically are 2-speed and in
2 voltage categories, 208/230 and 265 volts.

Consider the following safety issues:
• Prior to performing any service or maintenance on
electrical equipment you must Disconnect All
Power.
• New and unfamiliar tasks should be performed
under the supervision of an experienced service
technician.
• Personal protective equipment, such as safety
glasses and work gloves, should be worn.
• The floor around the work area should be clean and
free of debris.
• Make sure tools are the correct tools for the job,
and that they are working properly and in good
condition.
• The 52C,P unit may weigh up to 150 pounds. Use a
lifting device or ask for assistance if the unit must
be moved.

FAN MOTOR TROUBLESHOOTING
Refer to Figure 56 for a basic fan motor troubleshooting chart.
■

TOOLS NEEDED — The following list includes recommended tools and devices for working on the fan
motor of 52C,P units.

BASIC FAN MOTOR ELECTRICAL TESTS

Gloves
Safety Glasses
Regular and Phillips Head Screw Drivers
Small Adjustable Wrench
Channel Lock Pliers
Volt-ohmmeter
5/ -in. Nut Driver
16

There are 2 basic electrical tests for PSC fan motors
that will determine the electrical state of the motor.
The first test requires checking the electrical resistance between the motor windings. The second test
requires checking the electrical resistance between the
motor windings and ground. These tests may be
accomplished by performing the following steps:
1. DISCONNECT ALL POWER TO UNIT.
2. Open the control box as detailed in the UNIT
DISASSEMBLY section.
3. Label and disconnect the fan motor wires from
the selector switch and capacitor as shown in
Figure 54. Two-speed motors have 2 wires on the
capacitor and 2 wires on the push button switch.
4. Measure and record the resistance between the
black wire and each of the other wires. Make sure
the motor is cool before attempting to measure
resistance. The internal thermostat of the motor
may be electrically open and will not close until
the motor cools. See Figure 57 for typical motor
winding resistance measurements. The resistance
values in the table are approximate. Values that
are within 10% of those listed are acceptable. If
the motor in your model is not listed, find a motor
of similar horsepower and voltage on the chart
and compare it to the resistance measurements of
your motor.
5. Measure the resistance of each of the motor wires
to the motor casing. The resistance should be infinite. Make sure the motor is cool before attempting to measure resistance. The internal
thermostat of the motor may be electrically open
and will not close until the motor cools. A motor
that has measurable resistance to ground is
shorted to ground and must be replaced.

FIGURE 55 — TWO-SPEED, PERMANENT
SPLIT CAPACITOR MOTOR (PSC)

52C,P
SERIES
POSSIBLE CAUSE
DEFECTIVE BEARING
CAPACITOR DEFECTIVE
SWITCH DEFECTIVE
LOW LINE VOLTAGE
SHORTED MOTOR WINDING
NO POWER TO UNIT
INTERNAL THERMOSTAT OPEN
MISWIRED
FAN STUCK
BROKEN MOTOR WIRE
MOTOR WINDING GROUNDED
OPEN MOTOR WINDING

Motor Hums
But Does
Not Start
X
X

Makes No Noise
and Does Not
Start

SYMPTOM
Starts But
Stops After
Short Time
X
X

Starts
But Runs
Slow
X

Runs On
One Speed,
Not On Others

X
X
X

X
X

X
X
X
X

X
X
X
X
X

X
X

X
X
X

FIGURE 56 — FAN MOTOR TROUBLESHOOTING CHART

TYPICAL 208/230 VOLT MOTORS
UNIT 52C,P (BTUH)
CARRIER MOTOR PART NUMBER
MANUFACTURER’S
PART NUMBER
MOTOR VOLTAGE
MOTOR HORSEPOWER
MOTOR SPEEDS
RESISTANCE (OHMS)
BLACK TO WHITE WIRE
RESISTANCE (OHMS)
BLACK TO BROWN WIRE
RESISTANCE (OHMS)
BLACK TO RED WIRE

7,000/9,000
HC37GE237

12,000/15,000
HC37GE238

5KCP29ECA299A

5KCP29ECA301

208/230
.075
2

208/230
.125
2

101.4

45.8

38.8

32.9

NOTE: Resistance values are approximate.

TYPICAL 265 VOLT MOTORS
UNIT 52C,P (BTUH)
CARRIER MOTOR PART NUMBER
MANUFACTURER’S
PART NUMBER
MOTOR VOLTAGE
MOTOR HORSEPOWER
MOTOR SPEEDS
RESISTANCE (OHMS)
BLACK TO WHITE WIRE
RESISTANCE (OHMS)
BLACK TO BROWN WIRE
RESISTANCE (OHMS)
BLACK TO RED WIRE

7,000/9,000
HC29GE236

12,000/15,000
HC33GE239

5KCP29FCA315

5KCP29FCA316

265
.075
2

265
.125
2

144.0

83.7

29.3

39.1

82.1

45.2

NOTE: Resistance values are approximate.

FIGURE 57 — TYPICAL 52C,P FAN MOTORS

FAN MOTOR REPLACEMENT

9. Remove the top half of the condenser orifice as
detailed in Detach the Condenser Orifice From the
Condenser Coil section.
10. Using a Phillips head screwdriver, remove the fan
motor shield. The fan motor mounting screws
should now be accessible. Remove the 3 mounting
screws that secure the fan motor to the motor
mount and remove the fan motor from the unit.
11. Using needle nose pliers, remove condenser fan
hub clamp. Slide condenser fan off fan motor
shaft.
12. Re-install the new fan motor by reversing Steps 1
through 11.

1. DISCONNECT ALL POWER TO UNIT.
2. Remove the unit from the sleeve as detailed in the
UNIT DISASSEMBLY section and place the unit
on a large flat surface.
3. Remove the discharge deck and grille as detailed
in Remove the Discharge Deck Assembly section.
4. Remove heater plate assembly as detailed in
Accessing the Heater Assembly section. The
blower wheel should now be accessible.

Safety glasses should be worn to protect eyes in the
event the spring clip breaks free from pliers.
5. Using adjustable pliers, carefully remove the
5/32-in. Allen clip that secures the blower wheel to
the fan shaft. Remove the blower wheel.
6. Open the Control box as described in the UNIT
DISASSEMBLY section, Open the Control
Box. Disconnect the fan motor wires from the
rotary switch and capacitor. All units are
equipped with two-speed motors, which have
2 wires on the capacitor and 2 wires on the rotary
switch. Refer to the unit wiring schematic which
is attached to the front panel of the control box.
See Figure 58.
7. Carefully pull fan motor leads through the partition hole, located in the back of the control box.
8. Remove the top gussets, as detailed in Remove the
Gussets section.

POWER
CORD

WIRING
SCHEMATIC

FIGURE 58 — LOCATION OF WIRING SCHEMATIC
ON FRONT PANEL OF CONTROL BOX

Indoor Coil Delta Temperature (F)

100

75 F Indoor

80 F Indoor

Outdoor Air Temperature (F) (40% RH)
70 F Indoor

85 F Indoor

110

120

FIGURE 59 — 52C AND 52P 7000 BTU UNIT FIELD TEMPERATURE CHART — HIGH COOL — 50% RH

130

52C,P
SERIES
FIELD TEMPERATURE CHARTS
Refer to Figures 59-67 for field temperature data.

Indoor Coil Delta Temperature (F)

100

75 F Indoor

80 F Indoor

Outdoor Air Temperature (F) (40% RH)
70 F Indoor

85 F Indoor

110

120

FIGURE 60 — 52C AND 52P 9000 BTU UNIT FIELD TEMPERATURE CHART — HIGH COOL — 50% RH

130

Indoor Coil Delta Temperature (F)

100

75 F Indoor

80 F Indoor

Outdoor Air Temperature (F) (40% RH)
70 F Indoor

85 F Indoor

110

FIGURE 61 — 52P 12,000 BTU UNIT FIELD TEMPERATURE CHART — HIGH COOL — 50% RH

120

130

52C,P
SERIES

Indoor Coil Delta Temperature (F)

100

75 F Indoor

80 F Indoor

Outdoor Air Temperature (F) (40% RH)
70 F Indoor

85 F Indoor

110

120

FIGURE 62 — 52CQ 12,000 BTU HEAT PUMP UNIT FIELD TEMPERATURE CHART — HIGH COOL — 50% RH

130

Indoor Coil Delta Temperature (F)

100

75 F Indoor

80 F Indoor

Outdoor Air Temperature (F) (40% RH)
70 F Indoor

85 F Indoor

110

120

FIGURE 63 — 52CE 12,000 BTU HEAT/COOL UNIT FIELD TEMPERATURE CHART — HIGH COOL — 50% RH

130

52C,P
SERIES

Indoor Coil Delta Temperature (F)

100

75 F Indoor

80 F Indoor

Outdoor Air Temperature (F) (40% RH)
70 F Indoor

85 F Indoor

110

120

FIGURE 64 — 52C AND 52P 15,000 BTU UNIT FIELD TEMPERATURE CHART — HIGH COOL — 50% RH

130

Indoor Air Temperature Rise (F)

208 V, 2.3 kW
208 V, 3.4 kW
230/265 V, 2.3 kW
230/265 V, 3.4 kW

Indoor Entering Air Temperature (F)

FIGURE 65 — 52C AND 52P 7000/9000 BTU UNIT FIELD TEMPERATURE CHART FOR ELECTRIC HEAT — HIGH HEAT

52C,P
SERIES

230/265 V, 5.0 kW

230/265 V, 3.4 kW

230/265 V, 2.3 kW

208 V, 5.0 kW

208 V, 3.4 kW

208 V, 2.3 kW

Indoor Entering Air Temperature (F)

FIGURE 66 — 52C AND 52P 12,000/15,000 BTU UNIT FIELD TEMPERATURE CHART FOR ELECTRIC HEAT — HIGH HEAT

Indoor Air Temperature Rise (F)

15,000 Btu

52C-12,000 Btu

52P-12,000 Btu

9,000 Btu

7,000 Btu

Indoor Entering Air Temperature (F)

FIGURE 67 — 52C AND 52P 7,000-15,000 BTU UNIT FIELD TEMPERATURE CHART FOR REVERSE CYCLE HEAT — HIGH HEAT
47 F (DRYBULB)/43 F (WET BULB) OUTDOOR AIR

52C,P
SERIES

WIRING DIAGRAMS
Refer to Figures 68-72 for Typical Wiring Schematics.
NOTE: Figures 68-72 should not be substituted for the schematic located on control box.

COMPONENT LEGEND
Component Connection (Marked)

CAP
COMP
FM
FCS
HTR
IT
NEC
OFT
OL
PLS
RVS
SLS
ST
SW

—
—
—
—
—
—
—
—
—
—
—
—
—
—

Component Connection (Unmarked)
Accessory or Optional Wiring
To Indicate Common Potential Only
Not To Represent Wire
Capacitor
Compressor
Fan Motor
Fan Cycle Switch
Heater
Indoor Thermostat
National Electrical Code
Outdoor Frost Thermostat
Overload
Primary Limit Switch
Reversing Valve Solenoid
Secondary Limit Switch
Start Thermistor
Switch

NOTES:
1. Recommended for use on grounded power supply only.
2. Compressor and fan motor thermally protected.
3. Use copper conductors only.
4. All wiring must conform with NEC and local
codes.
5. Dashed lines indicate components when used.
6. OFT determines whether to bring on compressor heat or electric heat.

FIGURE 68 — 52CQ & 52PQ — TYPICAL WIRING SCHEMATIC FOR
STANDARD HEAT PUMP UNITS

52C,P
SERIES

TYPICAL THERMOSTAT INTERFACE
T’STAT OUTPUT:
RC CONTROLER OUTPUT:
UNIT OPERATION:
‘G’ — 24 VAC
‘FR’ — LINE VAC
FAN
‘G’ — 0 VAC
‘FR’ — 0 VAC
‘Y’ — 24 VAC
‘HR1 & HR2’ — LINE VAC
HEATING
‘O’ — 0 VAC
‘RVR’ — LINE VAC
‘W’ — 24 VAC
‘HR1 & HR2’ — LINE VAC
HEATING
‘Y’ — 24 VAC
‘CR’ — LINE VAC
COOLING
‘O’ — 24 VAC
‘RVR’ — 0 VAC
‘R’ — 24 VAC
‘R’ — 24 VAC OUTPUT
POWER TO WALL
‘C’ — COMMON
‘C’ — COMMON
THERMOSTAT
1. If ‘W’ is ON, then ‘FR’ is forced ON (regardless of ‘G’) & ‘CR’ is forced OFF.
2. If ‘Y’ is ON, then ‘FR’ is forced ON (regardless of ‘G’).
3. If IFT (indoor coil) is < 35° F, then ‘CR’ is forced OFF until IFT is > 39° F.
COMPONENT LEGEND
Component Connection (Marked)
Component Connection (Unmarked)
Terminal Board Connection
Field Splice
Field Control Wiring
Accessory or Optional Wiring

CAP
COMP
FM

—
—
—

To Indicate Common Potential Only
Not To Represent Wire
Capacitor
Compressor
Fan Motor

HTR
IFT
NEC
OFT
OL
PCBD
HR1
HR2
CR
FR
RVR
PLS
RVS
SLS
SSS
ST
TRANS

—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

Heater
Indoor Frost Thermostat
National Electrical Code
Outdoor Frost Thermostat
Overload
Printed Circuit Board
Heater Relay
Heater Relay
Compressor Relay
Fan Relay
Reversing Valve Relay
Primary Limit Switch
Reversing Valve Solenoid
Secondary Limit Switch
Speed Selector Switch
Start Thermistor
Transformer

NOTES:
1. Recommended for use on grounded power supply only.
2. Compressor and fan motor thermally protected.
3. Use copper conductors only.
4. All wiring must conform with NEC and local codes.
5. Dashed lines indicate components when used.
6. Field control wire suitable for NEC class 2 control circuit, at
24 volts.
7. OFT determines whether to bring on compressor heat or
electric heat.

FIGURE 69 — 52CQ AND 52 PQ — TYPICAL WIRING SCHEMATIC FOR
WALL THERMOSTAT HEAT PUMP UNITS

COMPONENT LEGEND
Component Connection (Marked)

CAP
COMP
FM
FCS
HTR
IT
NEC
OL
PLS
SLS
ST
SW

—
—
—
—
—
—
—
—
—
—
—
—

Component Connection (Unmarked)
Accessory or Optional Wiring
To Indicate Common Potential Only
Not To Represent Wire
Capacitor
Compressor
Fan Motor
Fan Cycle Switch
Heater
Indoor Thermostat
National Electrical Code
Overload
Primary Limit Switch
Secondary Limit Switch
Start Thermistor
Switch

FIGURE 70 — 52CE AND 52PE — TYPICAL WIRING SCHEMATIC FOR
STANDARD HEAT/COOL UNITS

52C,P
SERIES

COMPONENT LEGEND
Component Connection (Marked)
Component Connection (Unmarked)
Terminal Board Connection
Field Splice
Field Control Wiring
Accessory or Optional Wiring

CAP
COMP

—
—

To Indicate Common Potential Only
Not To Represent Wire
Capacitor
Compressor

FM
HTR
IFT
NEC
OL
PCBD
HR1
HR2
CR
FR
PLS
SLS
SSS
ST
TRANS

—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

Fan Motor
Heater
Indoor Frost Thermostat
National Electrical Code
Overload
Printed Circuit Board
Heater Relay
Heater Relay
Compressor Relay
Fan Relay
Primary Limit Switch
Secondary Limit Switch
Speed Selector Switch
Start Thermistor
Transformer

NOTES:
1. Recommended for use on grounded power supply only.
2. Compressor and fan motor thermally protected.
3. Use copper conductors only.
4. All wiring must conform with NEC and local codes.
5. Dashed lines indicate components when used.
6. Field control wire suitable for NEC class 2 control circuit, at
24 volts.

FIGURE 71 — 52CE AND 52PE — TYPICAL WIRING SCHEMATIC FOR
WALL THERMOSTAT CONTROL HEAT/COOL UNITS

FIGURE 72 — 52PC — TYPICAL WIRING SCHEMATIC FOR
STANDARD COOLING ONLY UNITS

52C,P
SERIES
MOST FREQUENT PTAC SERVICE QUESTIONS
1. Can remote wall thermostats be used on
standard (AA) models?
2. Which remote thermostats are acceptable
for use on 52C,P products?

3. How many 52C,P series units can be
controlled by one remote thermostat?
4. What is the vent capacity of the
52C,P products?
5. How do the 52C,P series models handle
condensate removal?

7.
8.
9.

No, only for use on remote control (RC,RP) models. However, accessory RC-Retrofit Kit can be ordered to convert
standard units to RC units.
HH01AD045 — Manual changeover thermostat
TSTATCCBPC01-B (Heat/Cool) — Non-Programmable
thermostat
TSTATCCBPH01-B (Heat Pump) — Non-Programmable
thermostat
TSTATCCPAC01-B (Heat/Cool) — Digital Programmable
thermostat
TSTATCCPHP01-B (Heat Pump) — Digital Programmable
thermostat
Maximum of 4.

50 cfm (standalone). Capacity can be increased with the
use of an external exhaust fan.
By using a 2-stage condensate removal system. First
stage uses a slinger ring to pick up condensate and move
it to the outdoor coil to be evaporated. In second stage, a
vortex pump will suck condensate water into the condenser airstream where it will be blown onto the outdoor
coil for evaporation.
At what temperature will the outdoor
When the outdoor coil temperature falls below 20 F
(defrost) thermostat switch the unit (heat (outdoor ambient temperature of approximately 35 F)
pumps only) into defrost (emergency heat) and will stay in a passive defrost until outdoor coil is
greater than 35 F.
mode?
Can the PTAC unit be configured to allow Yes. A switch located on the front of the control
continuous fan operation?
box is used to toggle between continuous or cycle
fan mode.
Can the discharge air grille be changed to Yes. Remove the 2 screws and flip the grille over
alter the direction of the airflow?
180 degrees.
What does the outdoor thermostat
The selector screw, located on the front of the control
switch do?
box, prevents the compressor from energizing in
heating mode during subfreezing conditions to ensure
adequate heating capacity. For units with unit-mounted
controls, the switch must be returned to the ‘‘heat pump’’
position for compressor operation during cooling modes.

ACCESSORIES
ACCESSORY
Wall Sleeves

Exterior Grilles†

FORM NUMBER
PART NUMBER
52S-48SI
WALL-SLEEVE-1PK
WALL-SLEEVE-9PK
SLEEVE-INSUL-1PK
52S-50SI
SLEEVE-STEEL-1PK
52S-49SI*
SLEEVE-EXT24-1PK
52C,P-20SI
FR-SLEEVE-EXT
52S-59SI
52S-65SI

52C,P-11SI

GRILLE-ALU-STAMP
GRILLE-PLA-BROWN
GRILLE-PLA-BEIGE
GRILLE-ALU-CLEAR
GRILLE-ALU-WHITE
GRILLE-ALU-BRONZ
GRILLE-ALU-MBRNZ
GRILLE-ALU-BROWN
GRILLE-ALU-BEIGE
GRILLE-ALU-ALPIN
GRILLE-ALU-PEACH
GRILLE-ALU-MELON
GRILLE-ALU-LGREY
GRILLE-ALU-SGREY
GRILLE-ALU-RDBRK
GRILLE-ALU-BLUE
GRILLE-ALU-GREEN
SUBBASE-NON-ELEC
SUBBASE-230V-15A
SUBBASE-230V-20A
SUBBASE-230V-30A
SUBBASE-265V-15A
SUBBASE-265V-20A
SUBBASE-265V-30A
SUBBASE-HARDWIRE
SUBBASE-SWITCH
SUBBASE-FUSE-15A
SUBBASE-FUSE-20A
SUBBASE-FUSE-30A
HARDWIRE-KIT-1PK

52C,P-19SI

CONDUIT-INTF-4PK

52S-53SI

DRAIN-KIT-4PK

N/A

HH01AD045
TSTATCCBPC01-B
TSTATCCBPH01-B
TSTATCCPAC01-B
TSTATCCPHP01-B
RC-FIELDKIT230HC

52S-60SI

Subbase

Subbase
Field-Installed
Kits
Electrical
Connections

Condensate
Drain Kit
Wall
Thermostats

Wall Thermostat
Interface
Retrofit Kit

52C,P-1SI
52C,P-2SI

52C,P-3SI
52C,P-4SI
52C,P-5SI

N/A

TSTAT-COVER-6X7

N/A

TSTAT-COVER-7X10

N/A

AIR-FILTER-10PK

Electro-mechanical Wall Thermostat (Heat/Cool and Heat Pump)
Value Series Electronic Thermostat w/Digital display (Heat/Cool Models)
Value Series Electronic Thermostat w/Digital display (Heat Pump Models)
7-Day Programmable Electronic Thermostat (Heat/Cool Models)
7-Day Programmable Electronic Thermostat (Heat Pump Models)
Field-installed wall thermostat retrofit kit to convert a standard 230 V Heat/Cool unit to an
RC unit. Wall thermostat sold separately (can be used to convert a cool only unit to RC).
Field-installed wall thermostat retrofit kit to convert a standard 230-V Heat Pump unit to an
RC unit. Wall thermostat sold separately.
Field-installed wall thermostat retrofit kit to convert a standard 265 V Heat/Cool unit to an
RC unit. Wall thermostat sold separately (can be used to convert a cool only unit to RC).
Field-installed wall thermostat retrofit kit to convert a standard 265-V Heat Pump unit to a
RC unit. Wall thermostat sold separately.
Clear plastic locking thermostat cover prevents unauthorized access to thermostat. Cover for use with
non-programmable and electro-mechanical thermostats. Outside dimensions: 61/2″ x 71/2″ x 215/16″.
1 per pack
Clear plastic locking thermostat cover prevents unauthorized access to thermostat. Cover for use with
programmable thermostats. Outside dimensions: 71/4″ x 93/4″ x 33/8″. 1 per pack
Replacement air filters in package of 10

52C,P-24SI

EM-KIT

Allows unit to be turned on and off from a remote location (includes freeze guard protection)

52C,P-23SI

SECURITY-DOOR

Key-locking security door to prevent access to heating and cooling controls

52C,P-14SI
52C,P-9SI
N/A

LATERAL-DUCT
DEFLECTOR-1PK
CURTDFL-52CP-1PK

Ductwork to allow one unit to heat and cool two rooms (plenum plus extension duct and registers)
Lateral air deflector, with individually adjustable louvers, to enhance air circulation, 1 per pack
Curtain deflector for 52C and 52P models — prevents curtains from blowing into discharge airstream.
1 per pack.
NOTE: Curtain deflector for previous models are also available. Contact Carrier Representative.

52C,P-16SI

RC-FIELDKIT230HP
RC-FIELDKIT265HC
RC-FIELDKIT265HP

Replacement
Filters
Energy
Management
Locking Security
Control Door
Lateral Duct Kit
Air/Curtain
Deflector

DESCRIPTION
Non-Insulated Plastic Wall Sleeve, 1 per pack
Non-Insulated Plastic Wall Sleeve, 9 per pack
Insulated Plastic Wall Sleeve, 1 per pack
Insulated Metal Wall Sleeve, 1 per pack
Extended Metal Wall Sleeve for Deep Wall Applications (24 in. deep), 1 per pack
Friedrich wall sleeve extension to retrofit Carrier PTAC unit into Friedrich 111/2″ deep (T Series) wall
sleeve. 1 per pack
Stamped Aluminum Exterior Grille, Clear Finish
Plastic Architectural Rear Grille, Brown
Plastic Architectural Rear Grille, Beige
Aluminum Architectural Exterior Grille, Clear Finish
Aluminum Architectural Exterior Grille, White
Aluminum Architectural Exterior Grille, Light Bronze
Aluminum Architectural Exterior Grille, Medium Bronze
Aluminum Architectural Exterior Grille, Brown (Dark Bronze)
Aluminum Architectural Exterior Grille, Beige
Aluminum Architectural Exterior Grille, Alpine (matches Carrier Wall Sleeve)
Aluminum Architectural Exterior Grille, Peach
Aluminum Architectural Exterior Grille, Melon
Aluminum Architectural Exterior Grille, Light Grey
Aluminum Architectural Exterior Grille, Slate Gray
Aluminum Architectural Exterior Grille, Red Brick
Aluminum Architectural Exterior Grille, Blue
Aluminum Architectural Exterior Grille, Green
Non-electrical Subbase
Electrical subbase with factory-installed 208/230 V, 15 amp receptacle
Electrical subbase with factory-installed 208/230 V, 20 amp receptacle
Electrical subbase with factory-installed 208/230 V, 30 amp receptacle
Electrical subbase with factory-installed 265 V, 15 amp receptacle
Electrical subbase with factory-installed 265 V, 20 amp receptacle
Electrical subbase with factory-installed 265 V, 30 amp receptacle
Electrical subbase with factory-installed hardwire kit (230/208 V and 265 V)
Field-Installable Switch kit for an electrical subbase
Field-Installed Fuse Kit (15 amp) for electrical subbase
Field-Installed Fuse Kit (20 amp) for electrical subbase
Field-Installed Fuse Kit (30 amp) for electrical subbase
Permanent power connection to the unit (includes 36″ of flexible conduit and unit-mounted
connector, 230/208 V and 265 V) 1 per pack
Interface kit for field-supplied conduit to provide permanent power connection (230/208 V and 265 V)
to the unit. Kit includes Molex connector for easy connect/disconnect. 4 per pack
Attaches to wall sleeve for controlled internal or external disposal of condensate 4 per pack

*Extended metal wall sleeve also available in 26 in. and 28 in. depth.
†Custom colors are also available.

52C,P
SERIES
52C PERFORMANCE AND PHYSICAL DATA
CATALOG
NUMBER

COOLING
(Btuh)

EER

ELECTRIC
HEAT (Btuh)

COP

52CE-207---3
52CE-307---3

7,000/ 6,900
7,000/ 6,900
9,000/ 8,900
9,000/ 8,900
12,000/11,900
12,000/11,900
12,000/11,900
14,500/14,000
14,500/14,000
14,500/14,000
7,000
7,000
8,900
8,900
12,000
12,000
12,000
14,500
14,500
14,500

11.1/11.1
11.1/11.1
10.7/10.7
10.7/10.7
10.1/10.1
10.1/10.1
10.1/10.1
9.4/ 9.5
9.4/ 9.5
9.4/ 9.5
11.1
11.1
10.7
10.7
10.1
10.1
10.1
9.4
9.4
9.4

7,800/ 6,400
11,600/ 9,700
7,800/ 6,400
11,600/ 9,700
7,800/ 6,400
11,600/ 9,700
17,000/13,600
7,800/ 6,400
11,600/ 9,700
17,000/13,600
7,800
11,600
7,800
11,600
7,800
11,600
17,000
7,800
11,600
17,000

—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

52CE-209---3
52CE-309---3
52CE-212---3
52CE-312---3
52CE-512---3
52CE-215---3
52CE-315---3
52CE-515---3
52CE-207---4
52CE-307---4
52CE-209---4
52CE-309---4
52CE-212---4
52CE-312---4
52CE-512---4
52CE-215---4
52CE-315---4
52CE-515---4

REVERSE
EVAP. FAN APPROX. 1-PH, 60 Hz CURRENT (AMPS) INPUT POWER (WATTS)
BRANCH
R-22
CYCLE
CFM
WEIGHT
CIRCUIT FUSE CHARGE
Electric
VOLTS
Cooling Electric
Cooling
HEAT (Btuh) (HI-SPEED) (SHIP)
(AMPS)
(oz)
Heat
Heat
—
260/250
125
230/208
2.7/2.9 10.4/ 9.5
631/ 622 2393/1985
15
24
—
260/250
125
230/208
2.7/2.9 15.2/14.1
631/ 622 3493/2935
20
24
—
260/250
125
230/208
3.7/3.8 10.4/ 9.5
841/ 832 2393/1985
15
24
—
260/250
125
230/208
3.7/3.8 15.2/14.1
841/ 832 3493/2935
20
24
—
350/320
140
230/208
5.2/5.6 10.8/ 9.9 1188/1178 2470/2047
15
34
—
350/320
140
230/208
5.2/5.6 15.6/14.5 1188/1178 3570/2997
20
34
—
350/320
140
230/208
5.2/5.6 22.5/20.0 1188/1178 5170/4147
30
34
—
350/320
150
230/208
6.8/7.6 10.9/10.0 1543/1473 2517/2117
15
35
—
350/320
150
230/208
6.8/7.6 15.7/14.6 1543/1473 3617/3067
20
35
—
350/320
150
230/208
6.8/7.6 22.6/20.1 1543/1473 5217/4217
30
35
—
260
125
265
2.4
9.2
631
2396
15
26
—
260
125
265
2.4
13.3
631
3496
20
26
—
260
125
265
3.1
9.2
832
2396
15
24
—
260
125
265
3.1
13.3
832
3496
20
24
—
340
140
265
4.6
9.4
1188
2470
15
34
—
340
140
265
4.6
13.5
1188
3570
20
34
—
340
140
265
4.6
19.6
1188
5170
25
34
—
340
150
265
6.0
9.7
1543
2517
15
36
—
340
150
265
6.0
13.8
1543
3617
20
36
—
340
150
265
6.0
19.9
1543
5217
25
36

FIGURE 73 — 52CE — PERFORMANCE AND PHYSICAL DATA FOR STANDARD HEAT/COOL UNITS

CATALOG
NUMBER

COOLING
(Btuh)

EER

ELECTRIC
HEAT (Btuh)

COP

REVERSE
CYCLE
HEAT (Btuh)

52CQ-207---3
52CQ-307---3
52CQ-209---3
52CQ-309---3
52CQ-212---3
52CQ-312---3
52CQ-512---3
52CQ-215---3
52CQ-315---3
52CQ-515---3
52CQ-207---4
52CQ-307---4
52CQ-209---4
52CQ-309---4
52CQ-212---4
52CQ-312---4
52CQ-512---4
52CQ-215---4
52CQ-315---4
52CQ-515---4

7,000/ 6,900
7,000/ 6,900
9,000/ 8,900
9,000/ 8,900
12,000/11,900
12,000/11,900
12,000/11,900
14,500/14,000
14,500/14,000
14,500/14,000
7,000

11.1/11.1
11.1/11.1
10.7/10.7
10.7/10.7
10.1/10.1
10.1/10.1
10.1/10.1
9.4/ 9.5
9.4/ 9.5
9.4/ 9.5
11.1

7,800/ 6,400
11,600/ 9,700
7,800/ 6,400
11,600/ 9,700
7,800/ 6,400
11,600/ 9,700
17,000/13,600
7,800/ 6,400
11,600/ 9,700
17,000/13,600
7,800

3.1/3.1
3.1/3.1
3.1/3.1
3.1/3.1
3.0/3.0
3.0/3.0
3.0/3.0
2.9/2.9
2.9/2.9
2.9/2.9
3.1

6,100/ 6,000
6,100/ 6,000
7,900/ 7,800
7,900/ 7,800
10,800/10,700
10,800/10,700
10,800/10,700
13,400/13,200
13,400/13,200
13,400/13,200
6,100

7,000
8,900
8,900
12,000
12,000
12,000
14,500
14,500
14,500

11.1
10.7
10.7
10.1
10.1
10.1
9.4
9.4
9.4

11,600
7,800
11,600
7,800
11,600
17,000
7,800
11,600
17,000

3.1
3.1
3.1
3.0
3.0
3.0
2.9
2.9
2.9

6,100
7,700
7,700
10,800
10,800
10,800
13,400
13,400
13,400

EVAP. FAN APPROX. 1-PH, 60 Hz CURRENT (AMPS) INPUT POWER (WATTS)
BRANCH
R-22
CFM
WEIGHT
CIRCUIT FUSE CHARGE
Electric
VOLTS
Cooling Electric
Cooling
(HI-SPEED) (SHIP)
(AMPS)
(oz)
Heat
Heat
260/250
125
230/208
2.7/2.9 10.4/ 9.5
631/ 622 2393/1985
15
24
260/250
125
230/208
2.7/2.9 15.2/14.1
631/ 622 3493/2935
20
24
260/250
125
230/208
3.7/3.8 10.4/ 9.5
841/ 832 2393/1985
15
24
260/250
125
230/208
3.7/3.8 15.2/14.1
841/ 832 3493/2935
20
24
350/320
140
230/208
4.7/5.2 10.8/ 9.9 1188/1178 2470/2047
15
34
350/320
140
230/208
4.7/5.2 15.6/14.5 1188/1178 3570/2997
20
34
350/320
140
230/208
4.7/5.2 22.5/20.0 1188/1178 5170/4147
30
34
350/320
150
230/208
6.8/7.6 10.9/10.0 1543/1473 2517/2117
15
35
350/320
150
230/208
6.8/7.6 15.7/14.6 1543/1473 3617/3067
20
35
350/320
150
230/208
6.8/7.6 22.6/20.1 1543/1473 5217/4217
30
35
260
125
265
2.4
9.2
631
2396
15
26
260
260
260
340
340
340
340
340
340

125
125
125
140
140
140
150
150
150

265
265
265
265
265
265
265
265
265

2.4
3.1
3.1
4.5
4.5
4.5
6.0
6.0
6.0

13.3
9.2
13.3
9.4
13.5
19.6
9.7
13.8
19.9

631
832
832
1188
1188
1188
1543
1543
1543

3496
2396
3496
2470
3570
5170
2517
3617
5217

20
15
20
15
20
25
15
20
25

FIGURE 74 — 52CQ — PERFORMANCE AND PHYSICAL DATA FOR STANDARD HEAT PUMP UNITS

26
24
24
34
34
34
36
36
36

52P PERFORMANCE AND PHYSICAL DATA
CATALOG
NUMBER

COOLING
(Btuh)

EER

ELECTRIC
HEAT (Btuh)

COP

52PE-207---3
52PE-307---3

7,200/ 7,100
7,200/ 7,100
9,100/ 9,000
9,100/ 9,000
12,100/12,000
12,100/12,000
12,100/12,000
14,500/14,000
14,500/14,000
14,500/14,000
7,200
7,200
9,100
9,100
12,100
12,100
12,100
14,500
14,500
14,500

12.7/12.7
12.7/12.7
11.5/11.5
11.5/11.5
11.1/10.7
11.1/10.7
11.1/10.7
9.4/ 9.5
9.4/ 9.5
9.4/ 9.5
12.7
12.7
11.5
11.5
11.1
11.1
11.1
9.4
9.4
9.4

—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—

52PE-209---3
52PE-309---3
52PE-212---3
52PE-312---3
52PE-512---3
52PE-215---3
52PE-315---3
52PE-515---3
52PE-207---4
52PE-307---4
52PE-209---4
52PE-309---4
52PE-212---4
52PE-312---4
52PE-512---4
52PE-215---4
52PE-315---4
52PE-515---4

REVERSE EVAP. FAN APPROX. 1-PH, 60 Hz CURRENT (AMPS) INPUT POWER (WATTS)
BRANCH
R-22
CYCLE
CFM
WEIGHT
CIRCUIT FUSE CHARGE
Electric
VOLTS
Cooling Electric
Cooling
HEAT (Btuh) (HI-SPEED)
(SHIP)
(AMPS)
(oz)
Heat
Heat
—
260/250
125
230/208
2.7/2.9 10.4/ 9.5
567/ 559 2393/1985
15
24
—
260/250
125
230/208
2.7/2.9 15.2/14.1
567/ 559 3493/2935
20
24
—
260/250
125
230/208
3.7/3.8 10.4/ 9.5
791/ 783 2393/1985
15
24
—
260/250
125
230/208
3.7/3.8 15.2/14.1
791/ 783 3493/2935
20
24
—
350/320
140
230/208
4.8/5.3 10.8/ 9.9 1090/1122 2470/2047
15
34
—
350/320
140
230/208
4.8/5.3 15.6/14.5 1090/1122 3570/2997
20
34
—
350/320
140
230/208
4.8/5.3 22.5/20.0 1090/1122 5170/4147
30
34
—
350/320
150
230/208
6.8/7.6 10.9/10.0 1543/1473 2517/2117
15
35
—
350/320
150
230/208
6.8/7.6 15.7/14.6 1543/1473 3617/3067
20
35
—
350/320
150
230/208
6.8/7.6 22.6/20.1 1543/1473 5217/4217
30
35
—
260
125
265
2.4
9.2
567
2396
15
26
—
260
125
265
2.4
13.3
567
3496
20
26
—
260
125
265
3.1
9.2
791
2396
15
24
—
260
125
265
3.1
13.3
791
3496
20
24
—
340
140
265
4.2
9.4
1090
2470
15
34
—
340
140
265
4.2
13.5
1090
3570
20
34
—
340
140
265
4.2
19.6
1090
5170
25
34
—
340
150
265
6.0
9.7
1543
2517
15
36
—
340
150
265
6.0
13.8
1543
3617
20
36
—
340
150
265
6.0
19.9
1543
5217
25
36

FIGURE 75 — 52PE — PERFORMANCE AND PHYSICAL DATA FOR STANDARD HEAT/COOL UNITS

CATALOG
NUMBER

COOLING
(Btuh)

EER

ELECTRIC
HEAT (Btuh)

COP

REVERSE
CYCLE
HEAT (Btuh)

52PQ-207---3
52PQ-307---3
52PQ-209---3
52PQ-309---3
52PQ-212---3
52PQ-312---3
52PQ-512---3
52PQ-215---3
52PQ-315---3
52PQ-515---3
52PQ-207---4
52PQ-307---4
52PQ-209---4
52PQ-309---4
52PQ-212---4
52PQ-312---4
52PQ-512---4
52PQ-215---4
52PQ-315---4
52PQ-515---4

7,200/ 7,100
7,200/ 7,100
9,100/ 9,000
9,100/ 9,000
12,100/12,000
12,100/12,000
12,100/12,000
14,500/14,000
14,500/14,000
14,500/14,000
7,200

12.7/12.7
12.7/12.7
11.5/11.5
11.5/11.5
11.1/10.7
11.1/10.7
11.1/10.7
9.4/ 9.5
9.4/ 9.5
9.4/ 9.5
12.7

7,800/ 6,400
11,600/ 9,700
7,800/ 6,400
11,600/ 9,700
7,800/ 6,400
11,600/ 9,700
17,000/13,600
7,800/ 6,400
11,600/ 9,700
17,000/13,600
7,800

3.4/3.4
3.4/3.4
3.2/3.2
3.2/3.2
3.2/3.2
3.2/3.2
3.2/3.2
2.9/2.9
2.9/2.9
2.9/2.9
3.4

6,300/ 6,300
6,300/ 6,300
7,900/ 7,900
7,900/ 7,900
11,000/11,000
11,000/11,000
11,000/11,000
13,400/13,200
13,400/13,200
13,400/13,200
6,300

7,200
9,100
9,100
12,100
12,100
12,100
14,500
14,500
14,500

12.7
11.5
11.5
11.1
11.1
11.1
9.4
9.4
9.4

11,600
7,800
11,600
7,800
11,600
17,000
7,800
11,600
17,000

3.4
3.2
3.2
3.2
3.2
3.2
2.9
2.9
2.9

6,300
7,700
7,700
10,800
10,800
10,800
13,400
13,400
13,400

EVAP. FAN APPROX. 1-PH, 60 Hz CURRENT (AMPS) INPUT POWER (WATTS)
BRANCH
R-22
CFM
WEIGHT
CIRCUIT FUSE CHARGE
Electric
VOLTS
Cooling Electric
Cooling
(HI-SPEED) (SHIP)
(AMPS)
(oz)
Heat
Heat
260/250
125
230/208
2.7/2.9 10.4/ 9.5
567/ 559 2393/1985
15
24
260/250
125
230/208
2.7/2.9 15.2/14.1
567/ 559 3493/2935
20
24
260/250
125
230/208
3.7/3.8 10.4/ 9.5
791/ 783 2393/1985
15
24
260/250
125
230/208
3.7/3.8 15.2/14.1
791/ 783 3493/2935
20
24
350/320
140
230/208
4.8/5.3 10.8/ 9.9 1090/1122 2470/2047
15
34
350/320
140
230/208
4.8/5.3 15.6/14.5 1090/1122 3570/2997
20
34
350/320
140
230/208
4.8/5.3 22.5/20.0 1090/1122 5170/4147
30
34
350/320
150
230/208
6.8/7.6 10.9/10.0 1543/1473 2517/2117
15
35
350/320
150
230/208
6.8/7.6 15.7/14.6 1543/1473 3617/3067
20
35
350/320
150
230/208
6.8/7.6 22.6/20.1 1543/1473 5217/4217
30
35
260
125
265
2.4
9.2
567
2396
15
26
260
260
260
340
340
340
340
340
340

125
125
125
140
140
140
150
150
150

265
265
265
265
265
265
265
265
265

2.4
3.1
3.1
4.2
4.2
4.2
6.0
6.0
6.0

13.3
9.2
13.3
9.4
13.5
19.6
9.7
13.8
19.9

567
791
791
1090
1090
1090
1543
1543
1543

3496
2396
3496
2470
3570
5170
2517
3617
5217

20
15
20
15
20
25
15
20
25

FIGURE 76 — 52PQ — PERFORMANCE AND PHYSICAL DATA FOR STANDARD HEAT PUMP UNITS

26
24
24
34
34
34
36
36
36

Copyright 2002 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 132
Catalog No. 535-20050
Printed in U.S.A.
Form 52C,P-2SM
Pg 52
11-02
Replaces: 52C,P-1SM
Book 1 4
Tab
9a 11a

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Page Count                      : 52
Author                          : Carrier Corporation

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