Service manual

TABLE OF CONTENTS
Basic Components and Their Functions
Refrigeration System Diagram
I. Refrigeration Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
II. Air Handling Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
III. Electric Power Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
IV. Tools And Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
V. Service Problems And Their Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
VI. Typical Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
QUICK DIAGNOSIS CHART
Note: This charge represents problems with units having mechanical controls - if the air conditioner
is equipped with a wall thermostat, please refer to the appropriate manual.
Problem Possible Causes Ref. Page Number
Fan And Compressor Will Not Run No Power 115V 14
Selector Switch 14
Fan Will Not Run Selector Switch 17
Fan Run Capacitor 17
Motor 17
Wiring (Mis-wired) 20-21
Compressor Will Not Run Selector Switch 15
Thermostat 15
Low Voltage 15
Overload 15
Compressor 15
Wiring (Mis-wired) 20-21
PTCR or Potential Relay 16-17
Start Capacitor 20-21
Run Capacitor
Cooling Performance 19