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 EVAPORATOR COILFIGURE 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 CONTROLSThe controls and components used in the 52C,P cool-ing only or heat/cool units are as follows: the selec-tor switch, th
21RYWGOCRYWGOCRYWGOCRYWGOCRYWGOCT’STATMASTERPTACUNIT 1UNIT 2UNIT 3FIGURE 41 — TYPICAL WIRING FOR MULTIPLE 52C PTAC UNITS CONNECTED TO 1 WALL THERMOSTA
52C,PSERIES22DESCRIPTION OF SELECTOR SWITCHSETTINGS (Figure 42) OFF MODE — The OFF position terminates unit operation. FAN ONLY MODE — Use fan onl
23SEQUENCE OF OPERATION HEAT/COOL UNITS (Figure 43)Fan Mode — With the selector switch set to FAN con-tacts L1 to HI and FCS1 to LS are made.Cooling
52C,PSERIES24The Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring
25 OUTDOOR FROST THERMOSTAT (Heat Pump Units) (Figure 48A and 48B) — The Outdoor Frost Thermostat (OFT) is a thermostat that uses a single-pole swit
52C,PSERIES265. The reading on the meter should first indicate zero, or a low resistance, then slowly rise toward infinity or some high value or measu
274. Remove the thermostat capillary from the outdoor coil and clip any wire ties holding the capillary in place.5. Disconnect the wires and carefully
52C,PSERIES28FAN MOTORThe fan motor is a permanent split capacitor (PSC) type motor. This motor is common in air-conditioning system applications. A P
29FIGURE 54 — FAN MOTOR TROUBLESHOOTING CHARTTYPICAL 208/230 VOLT MOTORSNOTE: Resistance values are approximate.TYPICAL 265 VOLT MOTORSNOTE: Resistanc
3UNIT DISASSEMBLYThis section includes common procedures for disas-sembly and re-assembly of unit. TOOLS NEEDEDThe following field-supplied items are
52C,PSERIES30FAN MOTOR REPLACEMENT1. DISCONNECT ALL POWER TO UNIT.2. Remove the unit from the sleeve as detailed in the UNIT DISASSEMBLY section and p
31FIGURE 57 — 52CQ — TYPICAL WIRING SCHEMATIC FOR STANDARD HEAT PUMP UNITSWIRING DIAGRAMSRefer to Figures 57-61 for Typical Wiring Schematics.NOTE: Fi
52C,PSERIES32FIGURE 58 — 52CQ — TYPICAL WIRING SCHEMATIC FOR WALL THERMOSTAT CONTROL HEAT PUMP UNITS
33FIGURE 59 — 52CE — TYPICAL WIRING SCHEMATIC FOR STANDARD HEAT/COOL UNITS
52C,PSERIES34FIGURE 60 — 52CE — TYPICAL WIRING SCHEMATIC FOR WALL THERMOSTAT CONTROL HEAT/COOL UNITS
35FIGURE 61 — 52PC — TYPICAL WIRING SCHEMATIC FOR STANDARD COOLING ONLY UNITS
52C,PSERIES36MOST FREQUENT PTAC SERVICE QUESTIONS1. Can remote wall thermostats be used on standard (AA) models?No, only for use on remote control (RC
37ACCESSORIES*Extended metal wall sleeve also available in 26 in. and 28 in. depth.†Custom colors are also available.ACCESSORY FORM NUMBER PART NUMBER
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
Copyright 2002 Carrier CorporationManufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and
5ACCESSING UNIT COMPONENTSACCESSING INDOOR-AIR SECTION COMPONENTS (UNITS WITH LATERAL DUCT ACCESSORY) REMOVE LATERAL DUCT EXTENSION ACCESSORY ONLY O
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,PSERIES8OUTDOOR COIL TUBESHEET SCREWSHUB CLAMPCONDENSERFANSCREW SCREWDISCHARGEGRILLEFRONT PANEL(BACK VIEW)CONTROL DOORHINGE PINSFIGURE 16 — LOCATI
9GENERAL CLEANINGMaintaining proper performance of 52C,P systems requires conscientious cleaning and care of compo-nents. See Figure 20. Specific comp
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