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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
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