Carrier 52M Performance Series Guida alla Risoluzione dei Problemi Pagina 1

SERVICE TECHNICIAN GUIDEPACKAGED TERMINAL AIR CONDITIONERSAND HEAT PUMPSCONTENTSPageINTRODUCTION...2,3SUMMARY OF DANGERS

GENERAL CLEANINGMaintaining proper performance of 52S systems(Figure 21) requires conscientious cleaning and care ofcomponents. Specific components req

TOOLS NEEDEDThe following list includes the recommended tools, de-vices, and cleaning solutions for use in cleaning the 52Sunit components.Vacuum Clea

n CLEANING THE VENT AIR FILTER1. Remove the unit chassis from wall sleeve as describedin the General Disassembly section of this manual.See Figure 6.2

SEASONAL CLEANINGn ACCESSING THE INDOOR AND OUTDOORCOILS — The minimum cleaning recommendation forindoor and outdoor coils is once per season. To acce

n CLEANING THE INDOOR AND OUTDOOR COILSCoil fins are sharp and may cut hands. Wear heavyprotective gloves when cleaning coils.1. Use a vacuum cleaner o

n CLEANING THE INDOOR FAN AND FANSCROLL — Once the indoor fan wheel and the indoorfan scroll have been accessed, proceed with the cleaninginstructions

COMPRESSORA cutaway view of the rotary compressor with key com-ponents labeled is shown in Figure 32. The motor sta-tor is rigidly attached to the com

The rotary compression process (Figure 33), starts attop dead center as shown in (1). Suction gas flowsthrough the suction inlet and into the cylinder

SYMPTOMgPOSSIBLE CAUSEfCOMPRESSORSTARTS ANDRUNS BUTCYCLES ON THEOVERLOADCOMPRESSORSTARTS AFTERCYCLING THEOVERLOADSEVERAL TIMESCOMPRESSORWILL NOTSTART.

5. Next, test the resistance individually of each wire tothe shell of the compressor. The paint on the com-pressor can prevent good contact between th

INTRODUCTIONThe focus of this manual is to provide basic informationon service procedures, safety, troubleshooting, clean-ing, and component replaceme

n REMOVING THE COMPRESSOR — Follow the stepsbelow to remove the compressor:1. Disconnect all power to unit.2. Remove unit from wall sleeve as detailed

10. For Heat Pump Units remove the capillary tubeonly.11. For Heat/Cool Units the filter drier is installed inthe liquid line, in place of the strainer

HEATERSThe heater in 52S units is located directly behind theevaporator coil. The heater assembly includes the heater(2.3 kW, 3.4 kW or 5 kW), a prima

3. Remove the unit from the sleeve as detailed in theGENERAL DISASSEMBLY section.4. Remove the discharge air grille and the discharge airdeck as detai

OPERATING CONTROLSThe controls and components used in the 52S coolingonly or heat/cool units are as follows: the selectorswitch, the indoor thermostat

DESCRIPTION OF SWITCH SETTINGSn OFF BUTTON — The OFF button terminates unitoperation.n FAN ONLY BUTTON — Push button for air circula-tion without heat

SEQUENCE OF OPERATIONn HEAT/COOL UNITS(Figure 50)Fan Mode — With the selector switch set to FAN andthe fan switch set to fan cycle, contacts L1 to LO

COMPONENT OPERATION ANDTROUBLESHOOTINGn TOOLS NEEDEDVolt-OhmmeterFlat and Phillips Screw Drivers5⁄16-in. Nut DriverSide Cutting PliersBefore cleaning,

n INDOOR THERMOSTAT (Heat Pump Units) (cont)(Figure 54) — To verify operation of the heat pump in-door thermostat switch, a continuity test may be per

n CAPACITOR — The 52S units use a dual capacitor.One part of the capacitor is used with the fanmotor. The other part of the capacitor is used by theco

FIGURE 2 — MODEL NUMBER NOMENCLATUREFIGURE 3 — SAMPLE DATA INFORMATION PLATE3

ELECTRICAL COMPONENTS REMOVALAND REPLACEMENTn INDOOR THERMOSTAT — To remove the indoorthermostat, perform the following steps:1. Turn off unit power a

n CAPACITOR — To remove the capacitor, performthe following steps:1.Turn off unit power as described in GENERALDISASSEMBLY section.2. Open the control

FAN MOTORThe fan motor is a permanent split capacitor (PSC) typemotor. This motor is common in air-conditioning sys-tem applications. A PSC motor does

SYMPTOM gPOSSIBLE CAUSEfMOTOR HUMSBUT DOESNOT STARTMAKES NO NOISEAND DOES NOTSTARTSTARTS BUTSTOPS AFTERSHORT TIMESTARTSBUT RUNSSLOWRUNS ONONE SPEED,NO

FAN MOTOR REPLACEMENTPerform the following steps to remove and reinstallthe fan motor:1. DISCONNECT ALL POWER TO UNIT.2. Remove the unit from the slee

FIELD TEMPERATURE CHARTSSee Figures 67 - 82 for field temperature data.FIGURE 67 — 52S 7,000 BTU UNIT FIELD TEMPERATURE CHART — LOW COOL — 50% RH35

FIGURE 68 — 52S 7,000 BTU UNIT FIELD TEMPERATURE CHART — HIGH COOL — 50% RH52SSERIES36

FIGURE 69 — 52S 7,000 BTU UNIT FIELD TEMPERATURE CHART, LOW HEAT MODE (47 F OUTDOOR TEMPERATURE)37

FIGURE 70 — 52S 7,000 BTU UNIT FIELD TEMPERATURE CHART, HIGH HEAT MODE (47 F OUTDOOR TEMPERATURE)52SSERIES38

FIGURE 71 — 52S 9,000 BTU UNIT FIELD TEMPERATURE CHART — LOW COOL — 50% RH39

GENERAL DISASSEMBLYThis section includes common procedures for disassem-bly and reassembly of 52S units. These instructionsare general in nature and i

FIGURE 72 — 52S 9,000 BTU UNIT FIELD TEMPERATURE CHART — HIGH COOL — 50% RH52SSERIES40

FIGURE 73 — 52S 9,000 BTU UNIT FIELD TEMPERATURE CHART, LOW HEAT MODE (47 F OUTDOOR TEMPERATURE)41

FIGURE 74 — 52S 9,000 BTU UNIT FIELD TEMPERATURE CHART, HIGH HEAT MODE (47 F OUTDOOR TEMPERATURE)52SSERIES42

FIGURE 75 — 52S 12,000 BTU UNIT FIELD TEMPERATURE CHART — LOW COOL — 50% RH43

FIGURE 76 — 52S 12,000 BTU UNIT FIELD TEMPERATURE CHART — HIGH COOL — 50% RH52SSERIES44

FIGURE 77 — 52S 12,000 BTU UNIT FIELD TEMPERATURE CHART, LOW HEAT MODE (47 F OUTDOOR TEMPERATURE)45

FIGURE 78 — 52S 12,000 BTU UNIT FIELD TEMPERATURE CHART, HIGH HEAT MODE (47 F OUTDOOR TEMPERATURE)52SSERIES46

FIGURE 79 — 52S 14,000 BTU UNIT FIELD TEMPERATURE CHART — LOW COOL — 50% RH47

FIGURE 80 — 52S 14,000 BTU UNIT FIELD TEMPERATURE CHART — HIGH COOL — 50% RH52SSERIES48

FIGURE 81 — 52S 14,000 BTU UNIT FIELD TEMPERATURE CHART, LOW HEAT MODE (47 F OUTDOOR TEMPERATURE)49

TO REMOVE THE LATERAL DUCTEXTENSION, FOR UNITS EQUIPPEDWITH THE LATERAL DUCTACCESSORYPACKAGE1. Remove the front panel as shown in Figure 1.2. Remove t

FIGURE 82 — 52S 14,000 BTU UNIT FIELD TEMPERATURE CHART, HIGH HEAT MODE (47 F OUTDOOR TEMPERATURE)52SSERIES50

WIRING SCHEMATICSRefer to Figures 83 - 87 for typical 52S unit wiring schematics.NOTE: Figures 83 - 87 should not be substituted for the schematicloca

LEGENDCAP — CapacitorCOMP — CompressorFCS — Fan Cycle SwitchFM — Fan MotorHTR — HeaterIT — Indoor ThermostatL—Power Supply LineOL — OverloadPL — PlugP

LEGENDCAP — CapacitorCOMP — CompressorCR — Cooling RelayEQUIP GND — Equipment GroundFM — Fan MotorFR — Fan RelayHR — Heating RelayIFT — Indoor Frost T

LEGENDCAP — CapacitorCOMP — CompressorFCS — Fan Cycle SwitchFM — Fan MotorHTR — HeaterIT — Indoor ThermostatL—Power Supply LineOL — OverloadPL — PlugP

LEGENDCAP — CapacitorCOMP — CompressorCR — Cooling RelayEQUIP GND — Equipment GroundFM — Fan MotorFR — Fan RelayHR — Heating RelayIFT — Indoor Frost T

MOST FREQUENT PTAC SERVICE QUESTIONS1. Can remote thermostats be used on standard (AA)models?No, only for use on remote control (RC) models.2. Which r

TO ACCESS INDOOR-AIR SECTIONCOMPONENTSn DISASSEMBLING THE LATERAL DUCTADAPTER, FOR UNITS EQUIPPED WITH THELATERAL DUCT ACCESSORY PACKAGE1.Remove the l

n TO REMOVE THE AIR DISCHARGE GRILLE1. Remove the 2 screws on each end of the air dischargegrille as shown in Figure 14.2. Lift and rotate back the bo

n TO REMOVE THE DISCHARGE DECK1. Remove the 2 discharge deck screws shown inFigure 17. Also remove the screw located at the topleft corner of the outd

n TO REMOVE THE STATOR — After pulling the topof the condenser orifice away from the condenser coil,grasp the top of the stator and slide it up and out