52C,P
SERIES
SERVICE TECHNICIAN GUIDE
PACKAGED TERMINAL AIR CONDITIONERS
AND HEAT PUMPS
Page
CONTENTS
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
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
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
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
FAN MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-31
FAN MOTOR TROUBLESHOOTING. . . . . . . . . . . . . 29
BASIC FAN MOTOR ELECTRICAL TESTS. . . . . . . . 29
FAN MOTOR REPLACEMENT. . . . . . . . . . . . . . . . . . 31
COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
ACCESSING OUTDOOR-AIR SECTION
COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
REINSTALL FRONT PANEL. . . . . . . . . . . . . . . . . . . . . 8
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
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
PTAC Customer Support Center
1•800•894•6449
52 PQ
A
3
12
3
0
1
AA
Series Designation
PTAC (Packaged Terminal Air Conditioner)
Chassis Options
Blank or AA – Standard
CP – Corrosion Protection
RC – Wall Thermostat Control
RP – Wall Thermostat Control with
Corrosion Protection
CE – Cooling with Electric Heat
CQ – Heat Pump with Electric Heat
PC – Cooling Only
PE – Cooling with Electric Heat
PQ – 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
Non-Performance
Changes 0-9
3 – 3.4 kW
5 – 5.0 kW
Cooling Capacity (nominal)
07 – 7,000 Btuh
Electrical Data
3 – 230/208-v, 60 Hz
4 – 265-v, 60 Hz
09 – 9,000 Btuh
12 – 12,000 Btuh
15 – 15,000 Btuh
FIGURE 2 — MODEL NUMBER NOMENCLATURE
UNIT DISASSEMBLY
This section includes common procedures for disas-
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.
sembly and re-assembly of unit.
IMPORTANT: Follow manufacturer’s instruc-
tions when disassembling and re-assembling a
unit for cleaning, maintenance, or part replace-
ment. 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, discon-
nect all power to avoid electric shock! Tag all dis-
connects. Never alter cord or plug and do not use
extension cords.
DISCONNECT POWER FOR
PERMANENTLY CONNECTED
(HARDWIRED) UNITS
1. Turn selector switch to OFF position.
2. Open the disconnect switch at main power supply.
Use proper Lockout and Tag procedures.
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
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.
3
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
LOCKING SCREW
REMOVED FILTER
(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.
ACCESS
PANEL
MOLEX
PLUGS
CONDUIT
FIGURE 5 — PLUG ASSEMBLY ON
HARDWIRE UNITS
FIGURE 4 — REMOVING FRONT PANEL
eplacement Package Terminal Air Conditioner,
LASSIFIED BY UNDERWRITERS LABORATO-
IES INC., AS TO ELECTRIC SHOCK, FIRE AND
ASUALTY HAZARDS ONLY. FOR FIELD INSTAL-
ATION WITH EXISTING WALL SLEEVES, OUT-
OOR, LOUVERS, AND INDOOR PANELS AS
PECIFIED ON THE PRODUCT.
4
CONTROL
BOX
SCREWS
VARIOUS ATTACHMENT
HOLE LOCATIONS
POWER
CORD
ACCESS
COVER
GE WALL
SLEEVE
HOLES
AMANA, TRANE
(SLOTTED
HOLES) WALL
SLEEVE HOLES
POWER
CORD
FIGURE 6 — CONTROL BOX COVER
CARRIER, BRYANT
WALL SLEEVE
HOLES
FIGURE 7 — PTAC UNIT TO WALL
SLEEVE MOUNTING SCREWS
ACCESSING UNIT 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.
ACCESSING INDOOR-AIR SECTION
COMPONENTS
ꢀ 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 exten-
sion. 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.
ACCESSING OUTDOOR-AIR SECTION
COMPONENTS
ꢀ REMOVE THE GUSSETS (See Figure 12)
1. Remove the 2 screws on each side that secure the
gussets to the partition.
3. Carefully lift the plenum up and away from front
panel and duct extension.
ꢀ REMOVE THE DISCHARGE DECK ASSEMBLY
2. Remove the 2 screws that secure the gussets to
the plastic condenser orifice and remove the
gussets.
1. Remove the front panel. Refer to R em ove F r on t
P a n el section and Figure 4.
5
2. Remove discharge screen screw using a /16-in. nut
driver. See Figure 9.
3. Remove the discharge deck assembly screws using
5
a /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.
5
52C,P
SERIES
END CAP
PLENUM
TOP
SCREWS (2)
LATERAL DUCT
EXTENSION
WALL
RIGHT
BRACKET
BRACKET LEFT
SCREWS 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
DECK
DISCHARGE
SCREEN
FIGURE 11 — REMOVAL OF HEATER
PLATE ASSEMBLY
FIGURE 9 — LOCATION OF ATTACHMENT
SCREWS ON DISCHARGE DECK OF UNIT
ꢀ DETACH THE CONDENSER ORIFICE FROM THE
CONDENSER COIL
d. Using Needle Nose Pliers remove condenser fan
hub clamp. See Figure 18.
1. Remove top half of condenser orifice.
e. Pull condenser fan off fan motor shaft.
f. Remove bottom half of condenser orifice.
3. Reassemble by reversing steps above.
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.
ꢀ REMOVE THE AIR DISCHARGE GRILLE
1. Remove the front panel from the unit, reference
Remove Front Panel section.
c. Remove top of condenser orifice. See Figure 15.
2. Remove bottom half of condenser orifice.
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.
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.
The grille can be positioned to direct the
discharge air up or out by simply rotating
the grille 180 degrees.
c. Carefully lift condenser up and away from con-
denser fan. Rest condenser on basepan. See
Figure 17.
6
GUSSET
GUSSET
SCREWS
CONDENSER
ORIFICE (PLASTIC)
FIGURE 14 — PRYING CONDENSER ORIFICE
AWAY FROM TUBE SHEET
PARTITION
GUSSET
SCREWS
GUSSET
FIGURE 12 — GUSSET REMOVAL
CONDENSER
ORIFICE
CAPTIVE
SCREWS (2)
CAPTIVE
SCREWS (2)
FIGURE 15 — REMOVING TOP OF
CONDENSER ORIFICE
FIGURE 13 — LOCATION OF CAPTIVE SCREWS
ON CONDENSER ORIFICE
7
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
SCREW
DISCHARGE
GRILLE
FRONT PANEL
(BACK VIEW)
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
8
GENERAL CLEANING
Maintaining proper performance of 52C,P systems
Con sid er th e follow in g sa fet y issu es b efor e
b egin n in g:
• 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 used.
• The floor around the work area should be clean and
free of debris.
• The 52C,P unit weighs up to 150 pounds. Use a lift-
ing device or ask for assistance if the unit must be
moved.
• Make sure tools are the correct tools for the job,
and that they are working properly and in good
condition.
requires conscientious cleaning and care of compo-
nents. 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, discon-
nect 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 mainte-
nance 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
CHASSIS
(STANDARD)
WALL SLEEVE
(ACCESSORY)
(STANDARD)
FIGURE 20 — STANDARD 52C UNIT
9
52C,P
SERIES
ꢀ REPLACING THE INDOOR AIR FILTER —
Remove the indoor air filter as detailed in Cleaning
the Indoor Air Filter. If damaged, use a filter replace-
ment with the Carrier Part No. AIR-FILTER-10PK,
available through Carrier Finished Goods and Carrier
Replacement Component Division.
TOOLS NEEDED
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
NOTE: Both filters are completely interchangeable.
ꢀ CLEANING THE OUTDOOR AIR VENT FILTER
Mild Household Detergent
Phillips Head Screwdriver
1. Remove the unit chassis from wall sleeve as
described in the General Disassembly section of
this manual. Refer to Rem ove th e Un it fr om
th e Wa ll Sleeve section.
2. Swing open vent door. The filter is located directly
behind the vent door. See Figure 22.
5
/
16-in. Nut Driver
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)
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.
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
ꢀ 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.
Safety Glasses
Protective Gloves
4. Replace vent filter using Carrier Part No.
52CQ500144.
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 Replace-
ment Component Division.
5. Reverse Steps 1-3 to reattach vent door.
ꢀ 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 electro-
static charges on the plastic components of the PTAC
unit.
ꢀ 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.
Use a clean cloth or brush to gently wipe exterior sur-
faces. Be careful not to push dirt or other fibers into
the unit’s interior components. Accessible wall sleeve
surfaces should also be wiped clean.
10
SEASONAL CLEANING
The indoor and outdoor coils should be cleaned at least
once during every season. Refer to ACCESSING
UNIT COMP ONE NTS 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 com-
pressor 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.
Coil fins are sharp and may cut hands. Wear heavy
p r ot ect ive gloves when cleaning coils.
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.
ꢀ 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.
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 con-
denser coil. See Figure 24. It is important to apply
the tool in the sa m e d ir ection of th e fin s, 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 satu-
rated. See Figure 25. Refer to instructions on the
cleaning solution containers for best results. Do
n ot u se a h igh -p r essu r e sp r a yer .
1. ACCESS AND CLEAN INDOOR F AN AND
F AN 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 com-
pressed air to blow off any dirt or dust that has
accumulated on the heater coils.
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.
NOTE: Do not direct air at the bi-metal discs on
the temperature limiter switches.
5. Drain water and cleaning solution that may have
collected in the basepan during the cleaning pro-
cess 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
11
52C,P
SERIES
FIGURE 23 — PTAC EXTERIOR SURFACES
FIGURE 25 — CLEANING COILS
FIGURE 24 — VACUUMING EVAPORATOR
COIL
DRAIN VALVE
FIGURE 26 — BASEPAN SECTION
12
COMPRESSOR
A cutaway view of the rotary compressor with key
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 pres-
sure and the vane spring keep the vane in contact with
the rolling piston.
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 sup-
ported by 2 bearings. Both the discharge valve and dis-
charge 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
13
52C,P
SERIES
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 com-
pressed 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. Contin-
uous suction and discharge allows for a smooth com-
pression process.
The rolling piston is not in actual contact with the cyl-
inder wall, vane, or bearing faces. Hydrodynamic seal-
ing prevents leakage from the compressed gas volume
to the suction volume via these paths. Precise control
of machining tolerances, surfaces, finishes, and assem-
bly clearances is critical to achieve high efficiency per-
formance. In addition, the line contact between the
vane tip and the rolling piston requires careful selec-
tion and control of materials to provide wear resis-
tance and reliable long-term operation.
BASIC HERMETIC COMPRESSOR
ELECTRICAL MEASUREMENTS
There are 2 basic electrical tests for hermetic compres-
sors 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 P OWE R TO TH E 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 capac-
itor, the START wire (BLUE) from the capacitor.
The third wire, COMMON wire (YELLOW) may
be connected to one of the following locations: for
P C u n its the wire is on the indoor thermostat,
for CE, P E R em ot e Con t r ol Un its the wire is
on the RC Control Board, for a ll ot h er CE , P E
Un it s the wire is located on the rotary selector
switch. F or ALL CQ, P Q Un it s the wire is on the
outdoor frost thermostat.
COMPRESSOR TROUBLESHOOTING
Refer to Figure 29 for a basic compressor troubleshoot-
ing chart.
F or com p r essor s t h a t a r e k n ow n t o b e d a m -
a ged : Remove refrigerant prior to disconnecting
compressor wires. Damaged hermetic compressor
terminals may become loose and eject from the com-
pressor. Wear safety glasses and keep your face
away from the area above the terminals when
removing compressor wires.
4. Perform a shorted/open windings test to measure
the resistance between the windings of the com-
pressor 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 over-
load 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
14
SYMPTOM
Compressor
Starts and
Runs But
Cycles On the
Overload
Compressor
Starts After
Cycling the
Overload
Compressor
Will Not
Start. It Hums
and Cycles On
the Overload
Compressor
Will Not Start
and Makes No
Noise
Compressor
Cycles Off
(Not On
POSSIBLE CAUSE
Overload)
Several Times
COILS/FILTERS DIRTY OR PLUGGED
X
AIR OR NONCONDENSABLE GASES
IN SYSTEM
X
X
SYSTEM REFRIGERANT OVERCHARGED
DISCHARGE LINE RESTRICTED
CAPILLARY TUBE OR STRAINER
RESTRICTED OR PLUGGED
X
X
X
X
X
X
X
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
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
SELECTOR SWITCH IS OPEN
OR DEFECTIVE
WIRING IS INCORRECT OR DEFECTIVE
SYSTEM PRESSURES NOT EQUALIZED
COMPRESSOR MOTOR OR
MECHANISM DEFECTIVE
COMPRESSOR GROUNDED
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
Con sid er th e follow in g sa fet y issu es b efor e
the resistance individually of each wire to the
shell of the compressor. The paint on the compres-
sor 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 volt-
ohmmeter 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.
b egin n in g:
• 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.
6. A compressor that has a winding to winding short
or a winding to compressor shell short is electri-
cally failed and needs to be replaced. See the
Com p r essor Rep la cem en t section for details.
• 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 tempera-
tures or loose connections.
COMPRESSOR REPLACEMENT
• 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.
Before working on the compressor, read the instruc-
tions thoroughly and gather the necessary tools for the
job. Review all safety information on unit and in liter-
ature. Always turn off all power to unit to avoid the
possibility of electrical shock.
15
52C,P
SERIES
ꢀ REMOVING THE COMPRESSOR — Follow the
steps below to remove the compressor:
1. Discon n ect a ll p ow er t o u n it.
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 t h e u n it is a h ea t p u m p : 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 pro-
cess 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 refriger-
ant using a certified refrigerant recovery system.
FIGURE 30 — SHORTED/OPEN WINDINGS TEST
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 ACCE SSING UNIT
COMP ONENTS section.
7. Remove the piercing valve and cut the crimped
portion of both process tubes off with a small tub-
ing cutter. Braze an access valve on each process
tube. Using a torch, disconnect the suction and
discharge tubes from the compressor connections.
FIGURE 31 — GROUNDED WINDINGS TEST
8. Remove the compressor mounting bolts, and
remove the compressor.
F or com p r essor s t h a t a r e k n ow n t o b e d a m -
a ged : Remove refrigerant prior to disconnecting
compressor wires. Damaged hermetic compressor
terminals may become loose and eject from the com-
pressor. 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.
9. F or a ll u n its: Remove and replace the strainer
and capillary tubes from the system. See Figure 32
for strainer and capillary tube location.
10. F or Hea t /Cool Un its: 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.
1/2-in. and 3/8-in. Tube Benders
1/2-in. Nut Driver
5
/16-in. Nut Driver
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
F or H ea t P u m p Un its: Use an in-line filter drier
(P/N P504-80845) and in sta ll b et w een t h e
r ever sin g va lve a n d t h e com p r essor a ccu m u -
la t or . There are several suction tube configura-
tions 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 compres-
sor and install them onto the new compressor.
Capillary Tubes
16
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. F or Hea t P u m p Un its: 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 pro-
cess is complete).
FIGURE 32 — STRAINER AND
CAPILLARY TUBE LOCATION
17. Reassemble the unit by reversing steps 1-9.
18. Connect the compressor wires and energize the
unit to verify operation.
ꢀ 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: Th e com p r essor sh ou ld n ever be
op er a t ed w it h ou t r efr iger a n t !
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
17
52C,P
SERIES
HEATERS
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.
COMMON CAUSES OF
HEATER FAILURE
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
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.
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.
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.
Before performing any cleaning, servicing, or main-
tenance to the unit, Discon n ect All P ow er 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.
Con sid er th e follow in g sa fet y issu es:
• Prior to performing any service or maintenance on
electrical equipment you must Discon n ect All
P ow er .
• 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
18
ꢀ TOOLS NEEDED — The following list includes rec-
ommended 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, b e
su r e a ll p ow er t o u n it is off.
To check resistance, set the volt-ohmmeter selector
switch to the lowest ohms value. Next connect the volt-
ohmmeter 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 r em ove th e H ea t er
Assem bly.
1. DISCONNECT ALL P OWER TO UNIT.
2. Remove heater by following instructions in
ACCESSING UNIT COMP ONENTS section.
Aft er th e h ea ter is r em oved , exa m in e t h e h ea t er
a s follow s to d et er m in e if it is op er a tion a l:
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.
ACCEPTABLE RESISTANCE
HEATER SIZE WATTS VOLTS
(Ohms)
2300
2300
3400
3400
5000
5000
230
265
230
265
230
265
20-23
28-31
13-16
19-21
9-11
2.3 kW
3.4 kW
5.0 kW
13-15
FIGURE 36 — ACCEPTABLE HEATER
RESISTANCE VALUES
FIGURE 35 — HEATER COIL (Removed)
19
52C,P
SERIES
OPERATING CONTROLS
The 52C,P h ea t p u m p u n it contains all the compo-
nents 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.
UNIT-MOUNTED CONTROLS
The controls and components used in the 52C,P cool-
in g on ly or h ea t /cool u n it s are as follows: the selec-
tor 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 temper-
ature 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 elec-
tric heater and off when the thermostat is satisfied.
IMPORTANT: Placing the override switch to elec-
tric heat mode operation will disable the compres-
sor 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.
The reversing valve allows for operation in reverse cycle
heat pump mode. The valve is located in the piping sys-
tem and is controlled by the reversing valve solenoid
coil. The coil is energized only during the heating mode.
SELECT0R
INDOOR
SWITCH
THERMOSTAT
75
80
70
85
65
60
90
TEMPERATURE
LIMITER
CON
CYC
FAN CYCLE
SWITCH
OUTDOOR FROST
THERMOSTAT
(HEAT PUMP
UNITS ONLY)
FIGURE 37 — 52C,P OPERATING CONTROLS
20
WALL-MOUNTED THERMOSTAT
CONTROLS
R
G
Y
R
G
Y
For 52C,P w a ll t h er m osta t con tr ol (R C, RP )
u n its, all controls are located on the wall-mounted
thermostat except the vent lever and outdoor thermo-
stat. 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 Fig-
ures 38-40. On remote control units, the fan cycle func-
tion 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.
TYPICAL
WALL
THERMOSTAT
W
O
C
W
O
C
TERMINAL
BLOCK
NOTES:
See Figures 41-43 for thermostat wiring.
TERMINAL
DESIGNATION
24 VAC
1. Use terminal “O” for heat pump con-
nection 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 connec-
tion between unit and digital thermostat.
R
G
Y
W
O
C
A field conversion kit is available to convert an AA
model (standard unit-mounted controls) to an RC
model (wall-mounted controls).
Fan
Compressor
Electric Heat
Reversing Valve
Common
IMPORTANT: No conversion kit is available to
convert from an RC model back to an AA model.
FIGURE 41 — WIRING CONNECTIONS
REMOTE THERMOSTAT
TROUBLESHOOTING
Th er m osta t d isp la y is b la n k :
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 connec-
tions at the thermostat terminal block. If connections
are good and there is 24 VAC with no display, the ther-
mostat should be replaced.
FIGURE 38 — NON-PROGRAMMABLE
THERMOSTAT
Th er m osta t d isp la y is w or k in g b u t u n it is n ot
h ea tin g or coolin g:
At the RC terminal block on the unit, measure the con-
trol 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.)
TERMINAL
METER READINGS (VAC)
MODE
O (For
HP Only)
R
G
Y
W
Fan Only
Cooling
24
24
24
24
0
24
0
0
0
24
Heating
Heat Pump Unit
Heat/Cool Unit
24
24
24
24
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 com-
pressor 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
21
52C,P
SERIES
R
Y
R
Y
T’STAT
MASTER
PTAC
W
G
O
C
W
G
O
C
R
Y
UNIT 1
UNIT 2
UNIT 3
W
G
O
C
R
Y
W
G
O
C
R
Y
W
G
O
C
NOTES:
1. Do not daisy chain R (24 VAC).
2. Maximum of 4 PTAC units can be connected
to one single wall thermostat.
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
22
DESCRIPTION OF SELECTOR SWITCH
SETTINGS (Figure 44)
ꢀ OFF MODE — The OFF position terminates unit
operation.
NON-USER ADJUSTABLE CONTROLS
ꢀ 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
ꢀ FAN ONLY MODE — Use fan only position for air
circulation without heating or cooling. Fan runs at
high speed.
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 temper-
ature setting is satisfied. This results in longer unit
off-time and slightly larger variations in room temper-
ature and humidity.
ꢀ HIGH HEAT OR HIGH COOL MODE — Position
selector and temperature control knobs to desired com-
fort 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 com-
fort 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 com p r essor operating
modes, both heating and cooling for units with
mounted controls. For wall thermostat controlled mod-
els the compressor is only disabled in heating and still
allowed to run in cooling.
ꢀ FINDING TEMPERATURE SETTING FOR COM-
FORT 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 comfort-
able, 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)
23
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) —
SEQUENCE OF OPERATION
ꢀ HEAT/COOL UNITS (Figure 45)
Fan Mode — With the selector switch set to FAN con-
tacts 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.
With the selector switch set to low
heat contacts L1 to IT1, FCS to LO and L2 to HTR are
made.
Heating (High) —
heat contacts L1 to IT1, FCS to HI, and L2 to HTR are
made.
With the selector switch set to high
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 acti-
vated 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.
SWITCH
CONTACTS MADE
POSITION
OFF
NONE
SWITCH
FAN
L1 TO HI, FCS1 TO LS
CONTACTS MADE
POSITION
LO HEAT
HI HEAT
LO COOL
HI COOL
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
OFF
FAN
LO HEAT
HI HEAT
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 45 — SELECTOR SWITCH CONTACTS,
ALL 52CE, PE ELECTRIC HEAT/COOL UNITS
FIGURE 47 — SELECTOR SWITCH CONTACT,
ALL 52CQ, PQ HEAT PUMP 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) —
COMPONENT OPERATION AND
TROUBLESHOOTING
ꢀ TOOLS NEEDED
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.
Volt-Ohmmeter
Flat and Phillips Screw Drivers
Cooling (High) —
With the selector switch set to high
5
/16-in. Nut Driver
speed cool contacts FCS to HI, L1 to IT3 are made.
Side Cutting Pliers
SWITCH
POSITION
CONTACTS MADE
OFF
NONE
FAN LO
FAN HI
LO COOL
HI COOL
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, discon-
nect 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 mainte-
nance tasks such as cleaning and replacing filters.
Refer to UNIT DISASSEMBLY section of this man-
ual 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 —
L1 to HI is made.
With the selector switch set to fan contact
Cooling (Low) —
With the selector switch set to low
cool contacts L1 to IT3 and FCS to LO are made.
24
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.
Con sid er t h e follow in g sa fety issu es:
4. Adjust the thermostat up or down to verify the
contacts of the switch open and close. When veri-
fying continuity of a closed switch, the ohm read-
ing should be 0 ohms. An open switch will show
OL on the meter.
• Prior to performing any service or maintenance on
electrical equipment you must Discon n ect All
P ow er .
• 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.
5. When testing is complete, reconnect the leads.
ꢀ 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 thermo-
stat 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 rap-
idly 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 approxi-
mately 20 F, the outdoor frost thermostat prevents
heat pump mode operation and immediately engages
the electric heat strip upon a call for heating. The elec-
tric heat strip is NEVER energized at the same time
as the compressor.
To verify operation of the heat pump indoor thermo-
stat switch, a continuity test may be performed as
follows:
ꢀ 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. Th e t h er m osta t DOE S
NOT sw it ch fr om h ea t in g t o coolin g, or coolin g
to h ea tin g. 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 con-
tinuity test may be performed as follows:
1. Tu r n off u n it p ow er as described in UNIT
DISASSEMBLY section.
2. Remove wire leads from thermostat. Note their
locations to ease re-assembly.
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 termi-
nal marked 3.
4. Adjust the thermostat up or down to verify the
contacts of the switch open and close. When veri-
fying 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 con-
tinuity 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.
FIGURE 48 — INDOOR THERMOSTAT (IT)
CONTACTS, ALL 52CE, PE MODELS
LEGEND (Figures 48-50)
COMP — Compressor
HTR — Heater
IT
— Indoor Thermostat
OFT — Outdoor Frost Thermostat
OL
— Overload
PLS — Primary Limit Switch
SLS — Secondary Limit Switch
7. When testing is complete, reconnect the leads.
25
52C,P
SERIES
To verify the OFT is operational, a continuity test may
be performed as follows:
1
BLK
1. Turn off unit power as described in UNIT
DISASSEMBLY section.
2. Remove the leads from the OFT. Note their loca-
tions to ease re-assembly.
2
3
BLU
GRY
ORN
4
3. Connect the continuity tester to the switch termi-
nals marked 1 and 2.
4. Rotate the override switch to the electric heat set-
ting and verify that there is continuity between
terminals 1 and 2.
5
6
BRN
IT
FIGURE 49 — INDOOR THERMOSTAT (IT)
CONTACTS, ALL 52CQ, PQ MODELS
5. To check the other contacts, move the lead on ter-
minal 1 to terminal 3. Rotate the override switch
to the heat pump setting. There should now be
continuity between terminals 2 and 3.
ꢀ OUTDOOR FROST THERMOSTAT (Heat Pump
Units) (Figure 50A and 50B) — The Outdoor Frost
Thermostat (OFT) is a thermostat that uses a single-
pole switch with a manual override selector. The ther-
mostat 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.
6. Once the test is complete, reconnect the leads.
ꢀ 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 opera-
tion. 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 manu-
facturer. If there are no visual signs of capacitor fail-
ure, testing of the capacitor resistance may be done
with a volt-ohmmeter as detailed below:
IMPORTANT: Placing the override switch to elec-
tric heat mode operation will disable the compres-
sor 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.
1. Tu r n off u n it p ow er as described in UNIT
DISASSEMBLY section but do not unplug the
service cord; it will supply ground connection for
the unit chassis. Ch eck t o en su r e p ow er is off
a n d LOCKE D OUT.
2. Connect one lead of a 20,000 ohm, 2-watt resistor
to the center group of terminals on the dual capac-
itor. 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 dis-
charge. 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
26
7. Remove the 2 screws mounting the thermostat to
the control box. Route thermostat bulb and capil-
lary 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. Tu r n off u n it p ow er 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 resis-
tance. This indicates the capacitor is most likely
good. If the reading goes to zero or a low resis-
tance 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 accord-
ing 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 continu-
ity test may be performed as follows:
1. Tu r n off u n it p ow er as described in UNIT
DISASSEMBLY section.
FIGURE 52 — FAN CYCLE SWITCH (3 Terminal)
SELECT0R
SWITCH
75
80
70
85
65
2. Label and remove the leads connected to fan cycle
switch. See Figure 52.
60
90
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.
TEMPERATURE
CONTROL
STANDOFF
PINS
CON
CYC
FAN CYCLE
SWITCH
4. Once test is complete, reconnect the leads.
ELECTRICAL COMPONENTS
REMOVAL AND REPLACEMENT
ꢀ INDOOR THERMOSTAT — To remove the indoor
thermostat, perform the following steps:
1. Tu r n off u n it p ow er as described in UNIT
DISASSEMBLY section.
2. Remove front panel.
3. Remove thermostat knob to expose 2 Phillips head
mounting screws.
OFT
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.
OUTDOOR FROST
THERMOSTAT
(HEAT PUMP
UNITS ONLY)
FIGURE 53 — 52C,P OPERATING CONTROLS
27
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.
ꢀ SELECTOR SWITCH — To remove the selector
switch from the unit, perform the following steps:
1. Tu r n off u n it p ow er 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.
6. Reverse Steps 1-5 to reinstall.
ꢀ CAPACITOR — To remove the capacitor, perform
the following steps:
4. Remove all the wires to the selector switch. Label
wires to simplify re-assembly. See Figure 54.
1. Tu r n off u n it p ow er as described in UNIT
DISASSEMBLY section.
5. Remove the 2 screws mounting the switch and
remove switch.
2. Open the control box as detailed in the UNIT
DISASSEMBLY section of this manual.
6. Reverse Steps 1-5 to reinstall.
3. Properly discharge the capacitor as described in
the Capacitor section under Com p on en t Op er a -
tion a n d Tr ou b lesh oot in g.
4. Remove the leads to the capacitor. Note the wire
locations to ease re-assembly.
CAPACITOR
5. Remove the screw holding the capacitor.
6. Remove capacitor.
7. Reverse Steps 1-6 to reinstall.
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:
POWER CORD
RIBBED WIRE (L2)
TO CAPACITOR (C)
1. Tu r n off u n it p ow er 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.
POWER CORD
PLAIN WIRE (L1)
TO ROTARY SWITCH
GROUND SCREW
FAN CYCLE
SWITCH
INDOOR
THERMOSTAT
SELECTOR
SWITCH
FIGURE 54 — COMPONENT LOCATIONS
IN OPEN CONTROL BOX
5. Reverse Steps 1-4 to reinstall.
28
FAN MOTOR
The fan motor is a permanent split capacitor (PSC)
Con sid er th e follow in g sa fet y issu es:
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 con-
nected between the run and start windings of the
motor. See Figure 55.
• Prior to performing any service or maintenance on
electrical equipment you must Discon n ect All
P ow er .
• 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.
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.
• 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 troubleshoot-
ing chart.
ꢀ TOOLS NEEDED — The following list includes rec-
ommended 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
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 resis-
tance 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:
Volt-ohmmeter
5
/
16-in. Nut Driver
1. DISCONNECT ALL P OWE R TO UNIT.
2. Open the control box as detailed in the UNIT
DISASSEMBLY section.
Before cleaning, servicing, performing maintenance
or removing the chassis from the wall sleeve, discon-
nect 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 mainte-
nance tasks such as cleaning and replacing filters.
Refer to UNIT DISASSEMBLY section of this man-
ual for proper procedures to disconnect power to
52C,P units.
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.
The Manufacturer reserves the right to discontinue, or
change at any time, specifications or designs without
notice and without incurring obligations.
5. Measure the resistance of each of the motor wires
to the motor casing. The resistance should be infi-
nite. Make sure the motor is cool before attempt-
ing 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)
29
52C,P
SERIES
SYMPTOM
Motor Hums
But Does
Not Start
Makes No Noise
and Does Not
Start
Starts But
Stops After
Short Time
Starts
But Runs
Slow
Runs On
One Speed,
Not On Others
POSSIBLE CAUSE
DEFECTIVE BEARING
CAPACITOR DEFECTIVE
SWITCH DEFECTIVE
LOW LINE VOLTAGE
SHORTED MOTOR WINDING
NO POWER TO UNIT
INTERNAL THERMOSTAT OPEN
MISWIRED
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
FAN STUCK
BROKEN MOTOR WIRE
MOTOR WINDING GROUNDED
OPEN MOTOR WINDING
X
X
X
FIGURE 56 — FAN MOTOR TROUBLESHOOTING CHART
TYPICAL 208/230 VOLT MOTORS
UNIT 52C,P (BTUH)
CARRIER MOTOR PART NUMBER
7,000/9,000
HC37GE237
12,000/15,000
HC37GE238
MANUFACTURER’S
PART NUMBER
5KCP29ECA299A
5KCP29ECA301
MOTOR VOLTAGE
MOTOR HORSEPOWER
MOTOR SPEEDS
208/230
.075
2
208/230
.125
2
RESISTANCE (OHMS)
101.4
45.8
38.8
90
71
BLACK TO WHITE WIRE
RESISTANCE (OHMS)
BLACK TO BROWN WIRE
RESISTANCE (OHMS)
BLACK TO RED WIRE
32.9
NOTE: Resistance values are approximate.
TYPICAL 265 VOLT MOTORS
UNIT 52C,P (BTUH)
CARRIER MOTOR PART NUMBER
7,000/9,000
HC29GE236
12,000/15,000
HC33GE239
MANUFACTURER’S
PART NUMBER
5KCP29FCA315
5KCP29FCA316
MOTOR VOLTAGE
MOTOR HORSEPOWER
MOTOR SPEEDS
265
.075
2
265
.125
2
RESISTANCE (OHMS)
144.0
29.3
82.1
83.7
39.1
45.2
BLACK TO WHITE WIRE
RESISTANCE (OHMS)
BLACK TO BROWN WIRE
RESISTANCE (OHMS)
BLACK TO RED WIRE
NOTE: Resistance values are approximate.
FIGURE 57 — TYPICAL 52C,P FAN MOTORS
30
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.
FAN MOTOR REPLACEMENT
1. DISCONNECT ALL P OWE R 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.
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.
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, Op en th e Con tr ol
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.
POWER
CORD
WIRING
SCHEMATIC
7. Carefully pull fan motor leads through the parti-
tion hole, located in the back of the control box.
8. Remove the top gussets, as detailed in Remove the
Gussets section.
FIGURE 58 — LOCATION OF WIRING SCHEMATIC
ON FRONT PANEL OF CONTROL BOX
31
52C,P
SERIES
FIELD TEMPERATURE CHARTS
Refer to Figures 59-67 for field temperature data.
e m p e r a t u r e ( F )
I n d o o r C o i l D e l t a T
32
e m p e r a t u r e ( F )
I n d o o r C o i l D e l t a T
33
52C,P
SERIES
e m p e r a t u r e ( F )
I n d o o r C o i l D e l t a T
34
e m p e r a t u r e ( F )
I n d o o r C o i l D e l t a T
35
52C,P
SERIES
e m p e r a t u r e ( F )
I n d o o r C o i l D e l t a T
36
e m p e r a t u r e ( F )
I n d o o r C o i l D e l t a T
37
52C,P
SERIES
e m p e A r i a r t T u r e I R n d i s o e o ( r F )
38
e m p e A r i a r t T u r e I R n d i s o e o ( r F )
39
52C,P
SERIES
e m p e A r i a r t T u r e I R n d i s o e o ( r F )
40
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
NOTES:
1. Recommended for use on grounded power sup-
ply only.
Component Connection (Marked)
Component Connection (Unmarked)
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 compres-
sor heat or electric heat.
Accessory or Optional Wiring
To Indicate Common Potential Only
Not To Represent Wire
Capacitor
CAP
COMP
FM
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Compressor
Fan Motor
Fan Cycle Switch
Heater
Indoor Thermostat
National Electrical Code
Outdoor Frost Thermostat
Overload
FCS
HTR
IT
NEC
OFT
OL
PLS
RVS
SLS
ST
Primary Limit Switch
Reversing Valve Solenoid
Secondary Limit Switch
Start Thermistor
SW
Switch
FIGURE 68 — 52CQ & 52PQ — TYPICAL WIRING SCHEMATIC FOR
STANDARD HEAT PUMP UNITS
41
52C,P
SERIES
TYPICAL THERMOSTAT INTERFACE
T’STAT OUTPUT:
RC CONTROLER OUTPUT:
UNIT OPERATION:
‘G’ — 24 VAC
‘G’ — 0 VAC
‘FR’ — LINE VAC
‘FR’ — 0 VAC
FAN
‘Y’ — 24 VAC
‘O’ — 0 VAC
‘W’ — 24 VAC
‘Y’ — 24 VAC
‘O’ — 24 VAC
‘HR1 & HR2’ — LINE VAC
‘RVR’ — LINE VAC
‘HR1 & HR2’ — LINE VAC
‘CR’ — LINE VAC
‘RVR’ — 0 VAC
HEATING
HEATING
COOLING
‘R’ — 24 VAC
‘C’ — COMMON
‘R’ — 24 VAC OUTPUT
‘C’ — COMMON
POWER TO WALL
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
NOTES:
1. Recommended for use on grounded power supply only.
HTR
IFT
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Heater
Component Connection (Marked)
Component Connection (Unmarked)
Terminal Board Connection
Field Splice
2. Compressor and fan motor thermally protected.
3. Use copper conductors only.
Indoor Frost Thermostat
National Electrical Code
Outdoor Frost Thermostat
Overload
NEC
OFT
OL
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.
PCBD
HR1
HR2
CR
Printed Circuit Board
Heater Relay
Heater Relay
Field Control Wiring
Compressor Relay
Fan Relay
FR
Accessory or Optional Wiring
RVR
PLS
RVS
SLS
SSS
ST
Reversing Valve Relay
Primary Limit Switch
Reversing Valve Solenoid
Secondary Limit Switch
Speed Selector Switch
Start Thermistor
To Indicate Common Potential Only
Not To Represent Wire
CAP
COMP
FM
—
—
—
Capacitor
Compressor
Fan Motor
TRANS
Transformer
FIGURE 69 — 52CQ AND 52 PQ — TYPICAL WIRING SCHEMATIC FOR
WALL THERMOSTAT HEAT PUMP UNITS
42
COMPONENT LEGEND
Component Connection (Marked)
NOTES:
1. Recommended for use on grounded power sup-
ply only.
2. Compressor and fan motor thermally protected.
3. Use copper conductors only.
4. All wiring must conform with NEC and local
codes.
Component Connection (Unmarked)
Accessory or Optional Wiring
To Indicate Common Potential Only
Not To Represent Wire
Capacitor
5. Dashed lines indicate components when used.
CAP
COMP
FM
—
—
—
—
—
—
—
—
—
—
—
—
Compressor
Fan Motor
Fan Cycle Switch
Heater
Indoor Thermostat
National Electrical Code
Overload
Primary Limit Switch
Secondary Limit Switch
Start Thermistor
Switch
FCS
HTR
IT
NEC
OL
PLS
SLS
ST
SW
FIGURE 70 — 52CE AND 52PE — TYPICAL WIRING SCHEMATIC FOR
STANDARD HEAT/COOL UNITS
43
52C,P
SERIES
COMPONENT LEGEND
NOTES:
1. Recommended for use on grounded power supply only.
FM
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Fan Motor
Component Connection (Marked)
Component Connection (Unmarked)
Terminal Board Connection
Field Splice
2. Compressor and fan motor thermally protected.
3. Use copper conductors only.
HTR
IFT
Heater
Indoor Frost Thermostat
National Electrical Code
Overload
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.
NEC
OL
PCBD
HR1
HR2
CR
Printed Circuit Board
Heater Relay
Heater Relay
Field Control Wiring
Compressor Relay
Fan Relay
FR
Accessory or Optional Wiring
PLS
SLS
SSS
ST
Primary Limit Switch
Secondary Limit Switch
Speed Selector Switch
Start Thermistor
Transformer
To Indicate Common Potential Only
Not To Represent Wire
CAP
COMP
—
—
Capacitor
Compressor
TRANS
FIGURE 71 — 52CE AND 52PE — TYPICAL WIRING SCHEMATIC FOR
WALL THERMOSTAT CONTROL HEAT/COOL UNITS
44
FIGURE 72 — 52PC — TYPICAL WIRING SCHEMATIC FOR
STANDARD COOLING ONLY UNITS
45
52C,P
SERIES
MOST FREQUENT PTAC SERVICE QUESTIONS
1. Can remote wall thermostats be used on
standard (AA) models?
No, on ly for u se on r em ote con t r ol (R C,R P ) m od els. H ow -
ever , a ccessor y R C-R etr ofit Kit ca n b e or d er ed to con ver t
st a n d a r d u n its to R C u n its.
2. Which remote thermostats are acceptable HH01AD045 — Ma n u a l ch a n geover t h er m osta t
for use on 52C,P products?
TSTATCCBP C01-B (Hea t/Cool) — Non -P r ogr a m m a b le
th er m osta t
TSTATCCBP H01-B (Hea t P u m p ) — Non -P r ogr a m m a ble
th er m osta t
TSTATCCP AC01-B (Hea t /Cool) — Digita l P r ogr a m m a b le
th er m osta t
TSTATCCP HP 01-B (Hea t P u m p ) — Digit a l P r ogr a m m a ble
th er m osta t
3. How many 52C,P series units can be
controlled by one remote thermostat?
Ma xim u m of 4.
4. What is the vent capacity of the
52C,P products?
50 cfm (sta n d a lon e). Ca p a city ca n b e in cr ea sed w ith t h e
u se of a n exter n a l exh a u st fa n .
5. How do the 52C,P series models handle
condensate removal?
By u sin g a 2-st a ge con d en sa te r em ova l syst em . F ir st
st a ge u ses a slin ger r in g t o p ick u p con d en sa te a n d m ove
it to th e ou td oor coil t o b e eva p or a ted . In secon d sta ge, a
vor tex p u m p w ill su ck con d en sa te w a t er in t o th e con -
d en ser a ir st r ea m w h er e it w ill b e b low n on to th e ou t d oor
coil for eva p or a t ion .
6. At what temperature will the outdoor
(defrost) thermostat switch the unit (heat
Wh en t h e ou t d oor coil t em p er a t u r e fa lls b elow 20 F
(ou td oor a m b ien t tem p er a tu r e of a p p r oxim a tely 35 F )
pumps only) into defrost (emergency heat) a n d w ill sta y in a p a ssive d efr ost u n til ou t d oor coil is
mode? gr ea t er th a n 35 F .
7. Can the PTAC unit be configured to allow Yes. A sw itch loca ted on th e fr on t of th e con t r ol
continuous fan operation?
b ox is u sed to toggle b etw een con t in u ou s or cycle
fa n m od e.
8. Can the discharge air grille be changed to Yes. R em ove th e 2 scr ew s a n d flip th e gr ille over
alter the direction of the airflow?
180 d egr ees.
9. What does the outdoor thermostat
switch do?
Th e select or scr ew , loca t ed on th e fr on t of t h e con tr ol
b ox, p r even ts th e com p r essor fr om en er gizin g in
h ea t in g m od e d u r in g su b fr eezin g con d it ion s t o en su r e
a d eq u a te h ea tin g ca p a city. F or u n it s w ith u n it -m ou n ted
con tr ols, t h e sw it ch m u st b e r etu r n ed t o t h e ‘‘h ea t p u m p ’’
p osit ion for com p r essor op er a tion d u r in g coolin g m od es.
46
ACCESSORIES
ACCESSORY
Wall Sleeves
FORM NUMBER
PART NUMBER
DESCRIPTION
52S-48SI
WALL-SLEEVE-1PK
WALL-SLEEVE-9PK
SLEEVE-INSUL-1PK
Non-Insulated Plastic Wall Sleeve, 1 per pack
Non-Insulated Plastic Wall Sleeve, 9 per pack
Insulated Plastic Wall Sleeve, 1 per pack
52S-50SI
SLEEVE-STEEL-1PK
SLEEVE-EXT24-1PK
FR-SLEEVE-EXT
Insulated Metal Wall Sleeve, 1 per pack
52S-49SI*
52C,P-20SI
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
Exterior Grilles† 52S-59SI
GRILLE-ALU-STAMP
Stamped Aluminum Exterior Grille, Clear Finish
52S-65SI
GRILLE-PLA-BROWN
GRILLE-PLA-BEIGE
Plastic Architectural Rear Grille, Brown
Plastic Architectural Rear Grille, Beige
52S-60SI
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
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
Subbase
52C,P-1SI
52C,P-2SI
SUBBASE-NON-ELEC
Non-electrical Subbase
SUBBASE-230V-15A
SUBBASE-230V-20A
SUBBASE-230V-30A
SUBBASE-265V-15A
SUBBASE-265V-20A
SUBBASE-265V-30A
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
52C,P-3SI
52C,P-4SI
52C,P-5SI
SUBBASE-HARDWIRE Electrical subbase with factory-installed hardwire kit (230/208 V and 265 V)
Subbase
Field-Installed
Kits
SUBBASE-SWITCH
Field-Installable Switch kit for an electrical subbase
SUBBASE-FUSE-15A
SUBBASE-FUSE-20A
SUBBASE-FUSE-30A
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
Electrical
52C,P-11SI
52C,P-19SI
52S-53SI
N/A
HARDWIRE-KIT-1PK
CONDUIT-INTF-4PK
DRAIN-KIT-4PK
Permanent power connection to the unit (includes 36″ of flexible conduit and unit-mounted
Connections
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
Condensate
Drain Kit
Attaches to wall sleeve for controlled internal or external disposal of condensate 4 per pack
Wall
Thermostats
HH01AD045
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)
TSTATCCBPC01-B
TSTATCCBPH01-B
TSTATCCPAC01-B
TSTATCCPHP01-B
Wall Thermostat 52C,P-16SI
Interface
Retrofit Kit
RC-FIELDKIT230HC
RC-FIELDKIT230HP
RC-FIELDKIT265HC
RC-FIELDKIT265HP
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.
N/A
N/A
TSTAT-COVER-6X7
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
TSTAT-COVER-7X10
AIR-FILTER-10PK
EM-KIT
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
Filters
Energy
Management
N/A
Replacement air filters in package of 10
52C,P-24SI
Allows unit to be turned on and off from a remote location (includes freeze guard protection)
Key-locking security door to prevent access to heating and cooling controls
Locking Security 52C,P-23SI
SECURITY-DOOR
Control Door
Lateral Duct Kit 52C,P-14SI
LATERAL-DUCT
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
Air/Curtain
Deflector
52C,P-9SI
N/A
DEFLECTOR-1PK
CURTDFL-52CP-1PK
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.
*Extended metal wall sleeve also available in 26 in. and 28 in. depth.
†Custom colors are also available.
47
52C,P
SERIES
52C PERFORMANCE AND PHYSICAL DATA
CURRENT (AMPS) INPUT POWER (WATTS)
REVERSE
CYCLE
EVAP. FAN APPROX.
BRANCH
R-22
CATALOG
NUMBER
COOLING
(Btuh)
ELECTRIC
HEAT (Btuh)
1-PH, 60 Hz
VOLTS
EER
COP
CFM
WEIGHT
CIRCUIT FUSE CHARGE
Electric
Heat
Electric
Heat
Cooling
Cooling
HEAT (Btuh) (HI-SPEED) (SHIP)
(AMPS)
(oz)
52CE-207---3 7,000/ 6,900 11.1/11.1 7,800/ 6,400
52CE-307---3 7,000/ 6,900 11.1/11.1 11,600/ 9,700
52CE-209---3 9,000/ 8,900 10.7/10.7 7,800/ 6,400
52CE-309---3 9,000/ 8,900 10.7/10.7 11,600/ 9,700
52CE-212---3 12,000/11,900 10.1/10.1 7,800/ 6,400
52CE-312---3 12,000/11,900 10.1/10.1 11,600/ 9,700
52CE-512---3 12,000/11,900 10.1/10.1 17,000/13,600
52CE-215---3 14,500/14,000 9.4/ 9.5 7,800/ 6,400
52CE-315---3 14,500/14,000 9.4/ 9.5 11,600/ 9,700
52CE-515---3 14,500/14,000 9.4/ 9.5 17,000/13,600
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
260/250
260/250
260/250
260/250
350/320
350/320
350/320
350/320
350/320
350/320
260
125
125
125
125
140
140
140
150
150
150
125
125
125
125
140
140
140
150
150
150
230/208
230/208
230/208
230/208
230/208
230/208
230/208
230/208
230/208
230/208
265
2.7/2.9 10.4/ 9.5
2.7/2.9 15.2/14.1
3.7/3.8 10.4/ 9.5
3.7/3.8 15.2/14.1
631/ 622 2393/1985
631/ 622 3493/2935
841/ 832 2393/1985
841/ 832 3493/2935
15
20
15
20
15
20
30
15
20
30
15
20
15
20
15
20
25
15
20
25
24
24
24
24
34
34
34
35
35
35
26
26
24
24
34
34
34
36
36
36
5.2/5.6 10.8/ 9.9 1188/1178 2470/2047
5.2/5.6 15.6/14.5 1188/1178 3570/2997
5.2/5.6 22.5/20.0 1188/1178 5170/4147
6.8/7.6 10.9/10.0 1543/1473 2517/2117
6.8/7.6 15.7/14.6 1543/1473 3617/3067
6.8/7.6 22.6/20.1 1543/1473 5217/4217
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
7,000
7,000
11.1
11.1
10.7
10.7
10.1
10.1
10.1
9.4
7,800
11,600
7,800
2.4
2.4
3.1
3.1
4.6
4.6
4.6
6.0
6.0
6.0
9.2
13.3
9.2
631
631
2396
3496
2396
3496
2470
3570
5170
2517
3617
5217
260
265
8,900
260
265
832
8,900
11,600
7,800
260
265
13.3
9.4
832
12,000
12,000
12,000
14,500
14,500
14,500
340
265
1188
1188
1188
1543
1543
1543
11,600
17,000
7,800
340
265
13.5
19.6
9.7
340
265
340
265
9.4
11,600
17,000
340
265
13.8
19.9
9.4
340
265
FIGURE 73 — 52CE — PERFORMANCE AND PHYSICAL DATA FOR STANDARD HEAT/COOL UNITS
CURRENT (AMPS) INPUT POWER (WATTS)
REVERSE
CYCLE
EVAP. FAN APPROX.
BRANCH
R-22
CATALOG
NUMBER
COOLING
(Btuh)
ELECTRIC
HEAT (Btuh)
1-PH, 60 Hz
VOLTS
EER
COP
CFM
WEIGHT
CIRCUIT FUSE CHARGE
Electric
Heat
Electric
Heat
Cooling
Cooling
HEAT (Btuh) (HI-SPEED) (SHIP)
(AMPS)
(oz)
52CQ-207---3 7,000/ 6,900 11.1/11.1 7,800/ 6,400 3.1/3.1 6,100/ 6,000
52CQ-307---3 7,000/ 6,900 11.1/11.1 11,600/ 9,700 3.1/3.1 6,100/ 6,000
52CQ-209---3 9,000/ 8,900 10.7/10.7 7,800/ 6,400 3.1/3.1 7,900/ 7,800
52CQ-309---3 9,000/ 8,900 10.7/10.7 11,600/ 9,700 3.1/3.1 7,900/ 7,800
52CQ-212---3 12,000/11,900 10.1/10.1 7,800/ 6,400 3.0/3.0 10,800/10,700
52CQ-312---3 12,000/11,900 10.1/10.1 11,600/ 9,700 3.0/3.0 10,800/10,700
52CQ-512---3 12,000/11,900 10.1/10.1 17,000/13,600 3.0/3.0 10,800/10,700
52CQ-215---3 14,500/14,000 9.4/ 9.5 7,800/ 6,400 2.9/2.9 13,400/13,200
52CQ-315---3 14,500/14,000 9.4/ 9.5 11,600/ 9,700 2.9/2.9 13,400/13,200
52CQ-515---3 14,500/14,000 9.4/ 9.5 17,000/13,600 2.9/2.9 13,400/13,200
260/250
260/250
260/250
260/250
350/320
350/320
350/320
350/320
350/320
350/320
260
125
125
125
125
140
140
140
150
150
150
125
125
125
125
140
140
140
150
150
150
230/208
230/208
230/208
230/208
230/208
230/208
230/208
230/208
230/208
230/208
265
2.7/2.9 10.4/ 9.5
2.7/2.9 15.2/14.1
3.7/3.8 10.4/ 9.5
3.7/3.8 15.2/14.1
631/ 622 2393/1985
631/ 622 3493/2935
841/ 832 2393/1985
841/ 832 3493/2935
15
20
15
20
15
20
30
15
20
30
15
20
15
20
15
20
25
15
20
25
24
24
24
24
34
34
34
35
35
35
26
26
24
24
34
34
34
36
36
36
4.7/5.2 10.8/ 9.9 1188/1178 2470/2047
4.7/5.2 15.6/14.5 1188/1178 3570/2997
4.7/5.2 22.5/20.0 1188/1178 5170/4147
6.8/7.6 10.9/10.0 1543/1473 2517/2117
6.8/7.6 15.7/14.6 1543/1473 3617/3067
6.8/7.6 22.6/20.1 1543/1473 5217/4217
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
7,000
11.1
11.1
10.7
10.7
10.1
10.1
10.1
9.4
7,800
11,600
7,800
3.1
3.1
3.1
3.1
3.0
3.0
3.0
2.9
2.9
2.9
6,100
6,100
2.4
2.4
3.1
3.1
4.5
4.5
4.5
6.0
6.0
6.0
9.2
13.3
9.2
631
631
2396
3496
2396
3496
2470
3570
5170
2517
3617
5217
260
265
8,900
7,700
260
265
832
8,900
11,600
7,800
7,700
260
265
13.3
9.4
832
12,000
12,000
12,000
14,500
14,500
14,500
10,800
10,800
10,800
13,400
13,400
13,400
340
265
1188
1188
1188
1543
1543
1543
11,600
17,000
7,800
340
265
13.5
19.6
9.7
340
265
340
265
9.4
11,600
17,000
340
265
13.8
19.9
9.4
340
265
FIGURE 74 — 52CQ — PERFORMANCE AND PHYSICAL DATA FOR STANDARD HEAT PUMP UNITS
48
52P PERFORMANCE AND PHYSICAL DATA
CURRENT (AMPS) INPUT POWER (WATTS)
REVERSE EVAP. FAN APPROX.
BRANCH
R-22
CATALOG
NUMBER
COOLING
(Btuh)
ELECTRIC
HEAT (Btuh)
1-PH, 60 Hz
VOLTS
EER
COP
CYCLE
CFM
WEIGHT
(SHIP)
CIRCUIT FUSE CHARGE
Electric
Heat
Electric
Heat
Cooling
Cooling
HEAT (Btuh) (HI-SPEED)
(AMPS)
(oz)
52PE-207---3 7,200/ 7,100 12.7/12.7 7,800/ 6,400
52PE-307---3 7,200/ 7,100 12.7/12.7 11,600/ 9,700
52PE-209---3 9,100/ 9,000 11.5/11.5 7,800/ 6,400
52PE-309---3 9,100/ 9,000 11.5/11.5 11,600/ 9,700
52PE-212---3 12,100/12,000 11.1/10.7 7,800/ 6,400
52PE-312---3 12,100/12,000 11.1/10.7 11,600/ 9,700
52PE-512---3 12,100/12,000 11.1/10.7 17,000/13,600
52PE-215---3 14,500/14,000 9.4/ 9.5 7,800/ 6,400
52PE-315---3 14,500/14,000 9.4/ 9.5 11,600/ 9,700
52PE-515---3 14,500/14,000 9.4/ 9.5 17,000/13,600
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
260/250
260/250
260/250
260/250
350/320
350/320
350/320
350/320
350/320
350/320
260
125
125
125
125
140
140
140
150
150
150
125
125
125
125
140
140
140
150
150
150
230/208
230/208
230/208
230/208
230/208
230/208
230/208
230/208
230/208
230/208
265
2.7/2.9 10.4/ 9.5
2.7/2.9 15.2/14.1
3.7/3.8 10.4/ 9.5
3.7/3.8 15.2/14.1
567/ 559 2393/1985
567/ 559 3493/2935
791/ 783 2393/1985
791/ 783 3493/2935
15
20
15
20
15
20
30
15
20
30
15
20
15
20
15
20
25
15
20
25
24
24
24
24
34
34
34
35
35
35
26
26
24
24
34
34
34
36
36
36
4.8/5.3 10.8/ 9.9 1090/1122 2470/2047
4.8/5.3 15.6/14.5 1090/1122 3570/2997
4.8/5.3 22.5/20.0 1090/1122 5170/4147
6.8/7.6 10.9/10.0 1543/1473 2517/2117
6.8/7.6 15.7/14.6 1543/1473 3617/3067
6.8/7.6 22.6/20.1 1543/1473 5217/4217
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
7,200
7,200
12.7
12.7
11.5
11.5
11.1
11.1
11.1
9.4
7,800
11,600
7,800
2.4
2.4
3.1
3.1
4.2
4.2
4.2
6.0
6.0
6.0
9.2
13.3
9.2
567
567
2396
3496
2396
3496
2470
3570
5170
2517
3617
5217
260
265
9,100
260
265
791
9,100
11,600
7,800
260
265
13.3
9.4
791
12,100
12,100
12,100
14,500
14,500
14,500
340
265
1090
1090
1090
1543
1543
1543
11,600
17,000
7,800
340
265
13.5
19.6
9.7
340
265
340
265
9.4
11,600
17,000
340
265
13.8
19.9
9.4
340
265
FIGURE 75 — 52PE — PERFORMANCE AND PHYSICAL DATA FOR STANDARD HEAT/COOL UNITS
CURRENT (AMPS) INPUT POWER (WATTS)
REVERSE
CYCLE
EVAP. FAN APPROX.
BRANCH
R-22
CATALOG
NUMBER
COOLING
(Btuh)
ELECTRIC
HEAT (Btuh)
1-PH, 60 Hz
VOLTS
EER
COP
CFM
WEIGHT
CIRCUIT FUSE CHARGE
Electric
Heat
Electric
Heat
Cooling
Cooling
HEAT (Btuh) (HI-SPEED) (SHIP)
(AMPS)
(oz)
52PQ-207---3 7,200/ 7,100 12.7/12.7 7,800/ 6,400 3.4/3.4 6,300/ 6,300
52PQ-307---3 7,200/ 7,100 12.7/12.7 11,600/ 9,700 3.4/3.4 6,300/ 6,300
52PQ-209---3 9,100/ 9,000 11.5/11.5 7,800/ 6,400 3.2/3.2 7,900/ 7,900
52PQ-309---3 9,100/ 9,000 11.5/11.5 11,600/ 9,700 3.2/3.2 7,900/ 7,900
52PQ-212---3 12,100/12,000 11.1/10.7 7,800/ 6,400 3.2/3.2 11,000/11,000
52PQ-312---3 12,100/12,000 11.1/10.7 11,600/ 9,700 3.2/3.2 11,000/11,000
52PQ-512---3 12,100/12,000 11.1/10.7 17,000/13,600 3.2/3.2 11,000/11,000
52PQ-215---3 14,500/14,000 9.4/ 9.5 7,800/ 6,400 2.9/2.9 13,400/13,200
52PQ-315---3 14,500/14,000 9.4/ 9.5 11,600/ 9,700 2.9/2.9 13,400/13,200
52PQ-515---3 14,500/14,000 9.4/ 9.5 17,000/13,600 2.9/2.9 13,400/13,200
260/250
260/250
260/250
260/250
350/320
350/320
350/320
350/320
350/320
350/320
260
125
125
125
125
140
140
140
150
150
150
125
125
125
125
140
140
140
150
150
150
230/208
230/208
230/208
230/208
230/208
230/208
230/208
230/208
230/208
230/208
265
2.7/2.9 10.4/ 9.5
2.7/2.9 15.2/14.1
3.7/3.8 10.4/ 9.5
3.7/3.8 15.2/14.1
567/ 559 2393/1985
567/ 559 3493/2935
791/ 783 2393/1985
791/ 783 3493/2935
15
20
15
20
15
20
30
15
20
30
15
20
15
20
15
20
25
15
20
25
24
24
24
24
34
34
34
35
35
35
26
26
24
24
34
34
34
36
36
36
4.8/5.3 10.8/ 9.9 1090/1122 2470/2047
4.8/5.3 15.6/14.5 1090/1122 3570/2997
4.8/5.3 22.5/20.0 1090/1122 5170/4147
6.8/7.6 10.9/10.0 1543/1473 2517/2117
6.8/7.6 15.7/14.6 1543/1473 3617/3067
6.8/7.6 22.6/20.1 1543/1473 5217/4217
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
7,200
12.7
12.7
11.5
11.5
11.1
11.1
11.1
9.4
7,800
11,600
7,800
3.4
3.4
3.2
3.2
3.2
3.2
3.2
2.9
2.9
2.9
6,300
6,300
2.4
2.4
3.1
3.1
4.2
4.2
4.2
6.0
6.0
6.0
9.2
13.3
9.2
567
567
2396
3496
2396
3496
2470
3570
5170
2517
3617
5217
260
265
9,100
7,700
260
265
791
9,100
11,600
7,800
7,700
260
265
13.3
9.4
791
12,100
12,100
12,100
14,500
14,500
14,500
10,800
10,800
10,800
13,400
13,400
13,400
340
265
1090
1090
1090
1543
1543
1543
11,600
17,000
7,800
340
265
13.5
19.6
9.7
340
265
340
265
9.4
11,600
17,000
340
265
13.8
19.9
9.4
340
265
FIGURE 76 — 52PQ — PERFORMANCE AND PHYSICAL DATA FOR STANDARD HEAT PUMP UNITS
49
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
Tab
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