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SERVICE TECHNICIAN GUIDE
PACKAGED TERMINAL AIR CONDITIONERS
AND HEAT PUMPS
CONTENTS
Page
INTRODUCTION
.................................2,3
SUMMARY OF DANGERS, WARNINGS, AND CAUTIONS
...2
GENERAL DISASSEMBLY
...........................4-9
TO DISCONNECT POWER FOR CORD-CONNECTED UNIT
..4
TO DISCONNECT POWER FOR PERMANENTLY
CONNECTED (HARDWIRED) UNITS
...................4
TO OPEN THE CONTROL BOX
.......................4
TO REMOVE THE UNIT FROM THE WALL SLEEVE
........4
TO REMOVE THE LATERAL DUCT EXTENSION, FOR
UNITS EQUIPPED WITH THE LATERIAL DUCT
ACCESSORY PACKAGE
............................5
TO ACCESS INDOOR-AIR SECTION COMPONENTS
.......6
TO ACCESS OUTDOOR-AIR SECTION COMPONENTS
......8
GENERAL CLEANING
............................10-15
CLEANING AND SAFETY
..........................10
TOOLS NEEDED
.................................11
MONTHLY CLEANING
............................11
SEASONAL CLEANING
...........................13
COMPRESSOR
..................................16-21
COMPRESSOR TROUBLESHOOTING
..................17
BASIC HERMETIC COMPRESSOR ELECTRICAL
MEASUREMENTS
................................17
COMPRESSOR REPLACEMENT
......................19
Page
HEATERS
......................................22,23
COMMON CAUSES OF HEATER FAILURE
..............22
HEATER REMOVAL
..............................22
OPERATING CONTROLS
.........................24-31
DESCRIPTION OF SWITCH SETTINGS
.................25
NON-USER ADJUSTABLE SWITCHES
.................25
SEQUENCE OF OPERATION
........................26
COMPONENT OPERATION AND TROUBLESHOOTING
....27
ELECTRICAL COMPONENTS REMOVAL AND
REPLACEMENT
.................................30
FAN MOTOR
...................................32-34
FAN MOTOR TROUBLESHOOTING
...................32
BASIC FAN MOTOR ELECTRICAL TESTS
...............32
FAN MOTOR REPLACEMENT
.......................34
FIELD TEMPERATURE CHARTS
....................35-50
WIRING SCHEMATICS
...........................51-55
MOST FREQUENT PTAC SERVICE QUESTIONS
..........56
52S
SERIES
PTAC Customer Support Center
1
800
894
6449
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Inhaltsverzeichnis

Seite 1 - SERVICE TECHNICIAN GUIDE

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

Seite 2 - INTRODUCTION

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

Seite 3

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

Seite 4 - GENERAL DISASSEMBLY

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

Seite 5 - EXTENSION, FOR UNITS EQUIPPED

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

Seite 6 - COMPONENTS

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

Seite 7 - TOP PANE

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

Seite 8 - TO ACCESS OUTDOOR-AIR SECTION

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

Seite 9 - FIGURE 20 — REMOVING STATOR

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

Seite 10 - WALL SLEEVE

SYMPTOMgPOSSIBLE CAUSEfCOMPRESSORSTARTS ANDRUNS BUTCYCLES ON THEOVERLOADCOMPRESSORSTARTS AFTERCYCLING THEOVERLOADSEVERAL TIMESCOMPRESSORWILL NOTSTART.

Seite 11 - MONTHLY CLEANING

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

Seite 12

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

Seite 13 - SEASONAL CLEANING

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

Seite 14

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

Seite 15

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

Seite 16 - COMPRESSOR

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

Seite 17 - BASIC HERMETIC COMPRESSOR

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

Seite 18

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

Seite 19 - COMPRESSOR REPLACEMENT

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

Seite 20

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

Seite 21

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

Seite 22 - HEATER REMOVAL

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

Seite 23 - SCREWS (2)

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

Seite 24 - OPERATING CONTROLS

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

Seite 25 - NON-USER ADJUSTABLE SWITCHES

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

Seite 26 - SEQUENCE OF OPERATION

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

Seite 27 - TROUBLESHOOTING

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

Seite 28

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

Seite 29

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

Seite 30 - AND REPLACEMENT

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

Seite 31

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

Seite 32 - FAN MOTOR

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

Seite 33 - TYPICAL 265 VOLT MOTORS

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

Seite 34 - FAN MOTOR REPLACEMENT

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

Seite 35 - FIELD TEMPERATURE CHARTS

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

Seite 36

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

Seite 37

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

Seite 38

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

Seite 39

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

Seite 40

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

Seite 41

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

Seite 42

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

Seite 43

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

Seite 44

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

Seite 45

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

Seite 46

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

Seite 47

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

Seite 48

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

Seite 49

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

Seite 50

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

Seite 51 - WIRING SCHEMATICS

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

Seite 52

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

Seite 53

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

Seite 54

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

Seite 55

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

Seite 56 - Tab 9a 11a

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

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