Carrier 52PQ Troubleshooting Guide Page 1

52C,PSERIESPTAC Customer Support Center1•800•894•6449SERVICE TECHNICIAN GUIDEPACKAGED TERMINAL AIR CONDITIONERSAND HEAT PUMPSCONTENTSPageINTRODUCTION.

52C,PSERIES10TOOLS NEEDEDThe following list includes the recommended tools, devices, and cleaning solutions for use in cleaning the 52C,P unit and com

11SEASONAL CLEANINGThe indoor and outdoor coils should be cleaned at least once during every season. Refer to ACCESSING UNIT COMPONENTS section to pre

52C,PSERIES12DRAIN VALVEFIGURE 24 — VACUUMING EVAPORATORCOILFIGURE 25 — CLEANING COILSFIGURE 23 — PTAC EXTERIOR SURFACESFIGURE 26 — BASEPAN SECTION

13COMPRESSORA cutaway view of the rotary compressor with key components labeled is shown in Figure 27. The motor stator is rigidly attached to the com

52C,PSERIES14The rotary compression process (Figure 28), starts at top dead center as shown in (1). Suction gas flows through the suction inlet and in

15FIGURE 29 — BASIC COMPRESSOR TROUBLESHOOTING GUIDE5. Next, perform a grounded windings test to test the resistance individually of each wire to the

52C,PSERIES16 TOOLS NEEDED — The following list includes the recommended tools and devices for removing and replacing the compressor. REMOVING THE

1712. Install the new compressor and the new capillary assembly (the correct capillary and strainer may be obtained from Carrier RCD), into the unit.1

52C,PSERIES18HEATERSThe heater in 52C,P units is located directly behind the evaporator coil. The heater assembly includes the heater (2.3 kW, 3.4 kW

19 TOOLS NEEDED — The following list includes rec-ommended tools and devices for working on the heater section of 52C,P units.Perform the following

52C,PSERIES2INTRODUCTIONThe focus of this manual is to provide basic information on service procedures, safety, troubleshooting, clean-ing, and compon

52C,PSERIES20OPERATING CONTROLSUNIT-MOUNTED CONTROLSThe controls and components used in the 52C,P cool-ing only or heat/cool units are as follows: the

21WALL-MOUNTED THERMOSTATCONTROLSFor 52C,P wall thermostat control (RC, RP) units, all controls are located on the wall-mounted thermostat except the

52C,PSERIES22RYWGOCRYWGOCRYWGOCRYWGOCRYWGOCT’STATMASTERPTACUNIT 1UNIT 2UNIT 3FIGURE 43 — TYPICAL WIRING FOR MULTIPLE 52C PTAC UNITS CONNECTEDTO ONE WA

23DESCRIPTION OF SELECTOR SWITCHSETTINGS (Figure 44) OFF MODE — The OFF position terminates unit operation. FAN ONLY MODE — Use fan only position

52C,PSERIES24SEQUENCE 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 m

25The Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligation

52C,PSERIES26 OUTDOOR FROST THERMOSTAT (Heat Pump Units) (Figure 50A and 50B) — The Outdoor Frost Thermostat (OFT) is a thermostat that uses a singl

275. 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

52C,PSERIES284. Remove the thermostat capillary from the outdoor coil and clip any wire ties holding the capillary in place.5. Disconnect the wires an

29FAN MOTORThe fan motor is a permanent split capacitor (PSC) type motor. This motor is common in air-conditioning system applications. A PSC motor do

3UNIT DISASSEMBLYThis section includes common procedures for disas-sembly and re-assembly of unit. TOOLS NEEDEDThe following field-supplied items are

52C,PSERIES30FIGURE 56 — FAN MOTOR TROUBLESHOOTING CHARTTYPICAL 208/230 VOLT MOTORSNOTE: Resistance values are approximate.TYPICAL 265 VOLT MOTORSNOTE

31FAN MOTOR REPLACEMENT1. DISCONNECT ALL POWER TO UNIT.2. Remove the unit from the sleeve as detailed in the UNIT DISASSEMBLY section and place the un

52C,PSERIES32141618202250 60 70 80 90 100 110 120 130Outdoor Air Temperature (F) (40% RH)70 F Indoor 75 F Indoor 80 F Indoor 85 F IndoorIndoor Coil De

33161820222450 60 70 80 90 100 110 120 130Outdoor Air Temperature (F) (40% RH)70 F Indoor 75 F Indoor 80 F Indoor 85 F IndoorIndoor Coil Delta Tempera

52C,PSERIES34182022242650 60 70 80 90 100 110 120 130Outdoor Air Temperature (F) (40% RH)70 F Indoor 75 F Indoor 80 F Indoor 85 F IndoorIndoor Coil De

352022242650 60 70 80 90 100 110 120 130Outdoor Air Temperature (F) (40% RH)70 F Indoor 75 F Indoor 80 F Indoor 85 F IndoorIndoor Coil Delta Temperatu

52C,PSERIES361820222450 60 70 80 90 100 110 120 130Outdoor Air Temperature (F) (40% RH)70 F Indoor 75 F Indoor 80 F Indoor 85 F IndoorIndoor Coil Delt

3718202224262850 60 70 80 90 100 110 120 130Outdoor Air Temperature (F) (40% RH)70 F Indoor 75 F Indoor 80 F Indoor 85 F IndoorIndoor Coil Delta Tempe

52C,PSERIES38202530354050 52 54 56 58 60 62 64 66 68 70 72 74Indoor Entering Air Temperature (F)Indoor Air Temperature Rise (F)208 V, 2.3 kW208 V, 3.4

391520253035404550 52 54 56 58 60 62 64 66 68 70 72 74Indoor Entering Air Temperature (F)208 V, 2.3 kW208 V, 3.4 kW208 V, 5.0 kW230/265 V, 2.3 kW230/2

52C,PSERIES4OPEN THE CONTROL BOXThe control box is factory wired. To open the box, remove the 2 screws on the top of the control box and lower the fro

52C,PSERIES4015202530354050 52 54 56 58 60 62 64 66 68 70 72Indoor Entering Air Temperature (F)7,000 Btu9,000 Btu52P-12,000 Btu52C-12,000 Btu15,000 Bt

41WIRING DIAGRAMSRefer to Figures 68-72 for Typical Wiring Schematics.NOTE: Figures 68-72 should not be substituted for the schematic located on contr

52C,PSERIES42TYPICAL THERMOSTAT INTERFACE1. If ‘W’ is ON, then ‘FR’ is forced ON (regardless of ‘G’) & ‘CR’ is forced OFF.2. If ‘Y’ is ON, then ‘F

43FIGURE 70 — 52CE AND 52PE — TYPICAL WIRING SCHEMATIC FORSTANDARD HEAT/COOL UNITSCOMPONENT LEGENDComponent Connection (Marked)Component Connection (U

52C,PSERIES44FIGURE 71 — 52CE AND 52PE — TYPICAL WIRING SCHEMATIC FOR WALL THERMOSTAT CONTROL HEAT/COOL UNITSNOTES:1. Recommended for use on grounded

45FIGURE 72 — 52PC — TYPICAL WIRING SCHEMATIC FOR STANDARD COOLING ONLY UNITS

52C,PSERIES46MOST FREQUENT PTAC SERVICE QUESTIONS1. Can remote wall thermostats be used on standard (AA) models?No, only for use on remote control (RC

47ACCESSORIES*Extended metal wall sleeve also available in 26 in. and 28 in. depth.†Custom colors are also available.ACCESSORY FORM NUMBER PART NUMBER

52C,PSERIES4852C PERFORMANCE AND PHYSICAL DATAFIGURE 73 — 52CE — PERFORMANCE AND PHYSICAL DATA FOR STANDARD HEAT/COOL UNITSFIGURE 74 — 52CQ — PERFORMA

4952P PERFORMANCE AND PHYSICAL DATAFIGURE 75 — 52PE — PERFORMANCE AND PHYSICAL DATA FOR STANDARD HEAT/COOL UNITSFIGURE 76 — 52PQ — PERFORMANCE AND PHY

5ACCESSING UNIT COMPONENTSACCESSING INDOOR-AIR SECTION COMPONENTS REMOVE LATERAL DUCT EXTENSION ACCESSORY FOR UNITS EQUIPPED WITH THE LATERAL DUCT1.

Copyright 2002 Carrier CorporationManufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and

52C,PSERIES6 DETACH THE CONDENSER ORIFICE FROM THE CONDENSER COIL1. Remove top half of condenser orifice. a. Unscrew the top half of the condenser o

7GUSSETSCREWSGUSSETSCREWSPARTITION GUSSETCONDENSERORIFICE (PLASTIC)GUSSETCONDENSERORIFICECAPTIVESCREWS (2)CAPTIVESCREWS (2)FIGURE 12 — GUSSET REMOVALF

52C,PSERIES8REINSTALL FRONT PANEL1. Grasp the front panel firmly at the center of the top and bottom of the panel, tilting it forward 5 to 10 degrees

9GENERAL CLEANINGMaintaining proper performance of 52C,P systems requires conscientious cleaning and care of compo-nents. See Figure 20. Specific comp