Table of Contents
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SERVICE TECHNICIAN GUIDE
PACKAGED TERMINAL AIR CONDITIONERS
CONTENTS
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,3
SUMMARY OF DANGERS, WARNINGS,
AND CAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
UNIT DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,4
TOOLS NEEDED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
REMOVE FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . 3
CORD-CONNECTED UNIT . . . . . . . . . . . . . . . . . . . . . 3
CONNECTED (HARDWIRED) UNITS . . . . . . . . . . . . 3
OPEN THE CONTROL BOX . . . . . . . . . . . . . . . . . . . . . 4
ACCESSING UNIT COMPONENTS . . . . . . . . . . . . . .5-8
COMPONENTS (UNITS WITH LATERAL
DUCT ACCESSORY). . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
ACCESSING INDOOR-AIR SECTION
COMPONENTS (UNITS WITHOUT LATERAL
DUCT ACCESSORY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
GENERAL CLEANING . . . . . . . . . . . . . . . . . . . . . . . . .9-12
CLEANING AND SAFETY . . . . . . . . . . . . . . . . . . . . . . 9
TOOLS NEEDED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
MONTHLY CLEANING. . . . . . . . . . . . . . . . . . . . . . . . 10
SEASONAL CLEANING . . . . . . . . . . . . . . . . . . . . . . . 11
52C,P
52C,P
SERIES
SERIES
AND HEAT PUMPS
Page
COMPRESSOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-17
COMPRESSOR TROUBLESHOOTING . . . . . . . . . . . 14
ELECTRICAL MEASUREMENTS . . . . . . . . . . . . . . . . 14
COMPRESSOR REPLACEMENT . . . . . . . . . . . . . . . . 15
HEATERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18,19
COMMON CAUSES OF HEATER FAILURE. . . . . . . 18
HEATER REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
OPERATING CONTROLS. . . . . . . . . . . . . . . . . . . . . 20-27
NON-USER ADJUSTABLE CONTROLS . . . . . . . . . . 22
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . 23
AND REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . 26
FAN MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-30
FAN MOTOR TROUBLESHOOTING. . . . . . . . . . . . . 28
BASIC FAN MOTOR ELECTRICAL TESTS . . . . . . . . 28
FAN MOTOR REPLACEMENT . . . . . . . . . . . . . . . . . . 30
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . 31-35
MOST FREQUENT PTAC SERVICE
QUESTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
ACCESSORIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
PTAC Customer Support Center
1•800•894•6449
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Table of Contents
Troubleshooting
Related Manuals for Carrier P
Summary of Contents for Carrier P
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Page 1: Table Of Contents
MONTHLY CLEANING......10 SEASONAL CLEANING ..... . . 11 52C,P 52C,P... -
Page 2: Introduction
(PTAC) and heat pump units are self-contained for installation through the wall for individual room heat- ing and cooling. The Model 52C,P polymer and metal sleeves are permanently fastened to the wall; the unit chassis slides out of the sleeve to allow the service technician easy access. -
Page 3: Unit Disassembly
Series Designation PTAC (Packaged Terminal Air Conditioner) 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 Electric Heater Size 0 –... -
Page 4: Open The Control Box
52C,P SERIES REMOVABLE LOCATION OF LOCKING SCREW FILTER REMOVED FILTER (NOTE: 2nd LOCKING SCREW IS LOCATED BEHIND 2nd FILTER) FIGURE 3 — LOCATION OF LOCKING SCREWS BEHIND FILTERS FIGURE 4 — REMOVING FRONT PANEL Replacement Package Terminal Air Conditioner, CLASSIFIED BY UNDERWRITERS LABORATO- RIES INC., AS TO ELECTRIC SHOCK, FIRE AND... -
Page 5: Accessing Unit Components
1. Remove the 2 screws on each side that secure the gussets to the partition. 2. Remove the 2 screws that secure the gussets to the plastic condenser orifice and remove the gussets. -in. nut GE WALL SLEEVE HOLES CARRIER, BRYANT WALL SLEEVE HOLES... - Page 6 52C,P SERIES END CAP PLENUM SCREWS (2) BRACKET LEFT SCREWS BRACKET FIGURE 8 — PTAC UNIT WITH LATERAL DUCT ACCESSORY INSTALLED ATTACHMENT SCREWS DISCHARGE DISCHARGE DECK SCREEN FIGURE 9 — LOCATION OF ATTACHMENT SCREWS ON DISCHARGE DECK OF UNIT DETACH THE CONDENSER ORIFICE FROM THE CONDENSER COIL 1.
- Page 7 GUSSET GUSSET SCREWS PARTITION GUSSET SCREWS FIGURE 12 — GUSSET REMOVAL CONDENSER ORIFICE CAPTIVE SCREWS (2) FIGURE 13 — LOCATION OF CAPTIVE SCREWS ON CONDENSER ORIFICE CONDENSER ORIFICE (PLASTIC) FIGURE 14 — PRYING CONDENSER ORIFICE GUSSET CAPTIVE SCREWS (2) FIGURE 15 — REMOVING TOP OF AWAY FROM TUBE SHEET CONDENSER ORIFICE...
- Page 8 52C,P SERIES OUTDOOR COIL TUBE SHEET SCREWS FIGURE 16 — LOCATION OF OUTDOOR COIL TUBE SHEET SCREWS FIGURE 17 — REMOVING OUTDOOR COIL FROM CONDENSER FAN HUB CLAMP FIGURE 18 — REMOVING CONDENSER FAN HUB CLAMP CONTROL DOOR SCREW HINGE PINS...
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Page 9: General Cleaning
• The floor around the work area should be clean and free of debris. Seasonally Seasonally • The 52C,P unit weighs up to 150 pounds. Use a lift- Seasonally ing device or ask for assistance if the unit must be moved. -
Page 10: Tools Needed
3. Using needle nose pliers, remove vent cable from vent door. 4. Using a small flat head screwdriver, pry the filter from the partition. 5. Replace vent filter using Carrier Part No. 52CQ500144. 6. Reverse Steps 1-4 to reattach vent door and cable. CHASSIS Occasional cleaning of the exterior surfaces of the PTAC unit optimizes the unit’s appearance and... -
Page 11: Seasonal Cleaning
SEASONAL CLEANING The indoor and outdoor coils should be cleaned at least once during every season. Refer to ACCESSING UNIT COMPONENTS section to prepare unit. CLEANING THE INDOOR AND OUTDOOR COILS Coil fins are sharp and may cut hands. Wear heavy protective gloves when cleaning coils. - Page 12 52C,P SERIES FIGURE 23 — PTAC EXTERIOR SURFACES FIGURE 25 — CLEANING COILS FIGURE 24 — VACUUMING EVAPORATOR COIL DRAIN VALVE FIGURE 26 — BASEPAN SECTION...
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Page 13: Compressor
A cutaway view of the rotary compressor with key components labeled is shown in Figure 27. The motor stator is rigidly attached to the compressor shell. The rotor is pressed onto the eccentric shaft, which is sup- ported by 2 bearings. Both the discharge valve and dis- charge muffler are attached to the motor bearing. -
Page 14: Compressor Troubleshooting
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. -
Page 15: Compressor Replacement
POSSIBLE CAUSE COILS/FILTERS DIRTY OR PLUGGED AIR OR NONCONDENSABLE GASES IN SYSTEM SYSTEM REFRIGERANT OVERCHARGED DISCHARGE LINE RESTRICTED CAPILLARY TUBE OR STRAINER RESTRICTED OR PLUGGED FAN BLADE OR MOTOR DEFECTIVE FAN BLADE OR BLOWER WHEEL STUCK SYSTEM REFRIGERANT UNDERCHARGED EVAPORATOR AIRFLOW RECIRCULATION UNIT OVERSIZED FOR APPLICATION COMPRESSOR REQUIRES START ASSIST NO POWER TO UNIT... - Page 16 See Figure 32 for strainer and capillary tube location. 10. For Heat/Cool Units: Use an in-line filter drier (P/N P504-80845). The filter drier can be installed in any location in suction line. See Figure 33A for general installation location.
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Page 17: Compressor
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. -
Page 18: Heaters
52C,P SERIES 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. -
Page 19: Heaters
TOOLS NEEDED — The following list includes rec- ommended tools and devices for working on the heater section of 52C,P units. Phillips Head Screw Driver Needle Nose Pliers Volt-ohmmeter Nut Driver -in. Perform the following steps to remove the Heater Assembly. -
Page 20: Operating Controls
52C,P SERIES OPERATING CONTROLS The controls and components used in the 52C,P cool- ing only or heat/cool units are as follows: the selec- tor switch, the indoor thermostat, the dual capacitor, the temperature limiter, the vent lever, and the fan cycle switch. - Page 21 MASTER PTAC UNIT 1 UNIT 2 UNIT 3 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 41 — TYPICAL WIRING FOR MULTIPLE 52C PTAC UNITS CONNECTED TO 1 WALL THERMOSTAT T’STAT NOTES: 1.
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Page 22: Description Of Selector Switch Settings (Figure 42)
52C,P SERIES DESCRIPTION OF SELECTOR SWITCH SETTINGS (Figure 42) OFF MODE — The OFF position terminates unit operation. FAN ONLY MODE — Use fan only position for air circulation without heating or cooling. Fan runs at high speed. HIGH HEAT OR HIGH COOL MODE — Position selector and temperature control knobs to desired com- fort level. -
Page 23: Sequence Of Operation
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. - Page 24 • 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.
- Page 25 2 and 3. 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.
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Page 26: Electrical Components Removal
See Figure 51. FIGURE 50 — FAN CYCLE SWITCH (3 Terminal) TEMPERATURE CONTROL STANDOFF PINS FAN CYCLE SWITCH OUTDOOR THERMOSTAT (HEAT PUMP UNITS ONLY) FIGURE 51 — 52C,P OPERATING CONTROLS SELECT0R SWITCH MOUNTING SCREWS... - Page 27 4. Remove the thermostat capillary from the outdoor coil and clip any wire ties holding the capillary in place. 5. Disconnect the wires and carefully remove the thermostat and capillary from the unit, noting location of wires for easy re-assembly. 6.
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Page 28: Fan Motor
• 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. - Page 29 NOT START START TYPICAL 208/230 VOLT MOTORS 7,000/9,000 HC37GE237 5KCP29ECA299A TYPICAL 265 VOLT MOTORS 7,000/9,000 HC29GE236 5KCP29FCA315 FIGURE 55 — TYPICAL 52C,P FAN MOTORS SYMPTOM STARTS BUT STARTS STOPS AFTER BUT RUNS ONE SPEED, SHORT TIME SLOW NOT ON OTHERS...
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Page 30: Fan Motor Replacement
52C,P SERIES FAN MOTOR REPLACEMENT 1. DISCONNECT ALL POWER TO UNIT. 2. Remove the unit from the sleeve as detailed in the UNIT DISASSEMBLY section and place the unit on a large flat surface. 3. Remove the discharge deck and grille as detailed in Remove The Discharge Deck Assembly section. -
Page 31: Wiring Diagrams
WIRING DIAGRAMS Refer to Figures 57-61 for Typical Wiring Schematics. NOTE: Figures 57-61 should not be substituted for the schematic located on control box. FIGURE 57 — 52CQ — TYPICAL WIRING SCHEMATIC FOR STANDARD HEAT PUMP UNITS... - Page 32 52C,P SERIES FIGURE 58 — 52CQ — TYPICAL WIRING SCHEMATIC FOR WALL THERMOSTAT CONTROL HEAT PUMP UNITS...
- Page 33 FIGURE 59 — 52CE — TYPICAL WIRING SCHEMATIC FOR STANDARD HEAT/COOL UNITS...
- Page 34 52C,P SERIES FIGURE 60 — 52CE — TYPICAL WIRING SCHEMATIC FOR WALL THERMOSTAT CONTROL HEAT/COOL UNITS...
- Page 35 FIGURE 61 — 52PC — TYPICAL WIRING SCHEMATIC FOR STANDARD COOLING ONLY UNITS...
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Page 36: Questions
1. Can remote wall thermostats be used on standard (AA) models? 2. Which remote thermostats are acceptable for use on 52C,P products? 3. How many 52C,P series units can be controlled by one remote thermostat? 4. What is the vent capacity of the 52C,P products? 5. -
Page 37: Accessories
Insulated Metal Wall Sleeve, 1 per pack Extended Metal Wall Sleeve for Deep Wall Applications (24 in. deep), 1 per pack Friedrich wall sleeve extension to retrofit Carrier PTAC unit into Friedrich 11 sleeve. 1 per pack Stamped Aluminum Exterior Grille, Clear Finish... - Page 40 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. 535-20019 Printed in U.S.A. Form 52C,P-1SM Pg 40 1-02 Replaces: New Book 1...
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