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Component Specifications
To avoid risk of electrical shock, personal injury, or death, disconnect power to unit and discharge capacitor
through a 10,000 ohm resistor before servicing, unless testing requires power. Wires removed during
disassembly must be replaced on proper terminals to ensure correct grounding and polarization.
Illustration
Component
Compressor
Fan motor
Capacitor
Overload protector
Electronic control
LINE 2
LINE 1
COMP
LOW
MED
HI
20110901 Revision 0
!
WARNING
Test Procedure
Check resistance of compressor windings:
Attach ohmmeter between winding C and S:
Attach ohmmeter between winding C and R:
Check compressor for grounds:
Attach one ohmmeter lead to compressor
case. Attach second ohmmeter lead to C,
then S, then R terminals on compressor:
NOTE: See Testing Procedures section of Service
Manual for additional compressor tests.
Check fan motor for grounds:
Attach one ohmmeter lead to fan motor case.
Attach second ohmmeter lead to each fan
motor lead, one at a time:
Check for continuity of fan motor windings:
Attach one ohmmeter lead to common fan
motor lead. Attach second lead to remaining
fan motor leads, one at a time:
Resistance (highest scale), with power removed.
Discharge capacitor and disconnect all attached
wires.
Attach ohmmeter leads between C terminal
and H terminal on capacitor:
Reverse leads on C and H terminals:
Attach ohmmeter leads between C terminal
and F terminal on capacitor:
Reverse leads on C and F terminals:
Resistance
Ensure temperature of protector is below
142°F ±16°F (61°C ±9°C). Check resistance
across leads:
Heat thermostat to 257°F ±9°F (125°C ±5°C):
Cool thermostat to 142°F ±16°F (61°C ±9°C):
Check for opens in wiring between circuit board
terminals and component connections.
See wiring diagram for specific wire terminal
positions.
2
Results
Ohmmeter indicates <10 Ω but >0 Ω
Ohmmeter indicates <10 Ω but >0 Ω
Ohmmeter indicates open on each terminal.
Ohmmeter indicates open on each lead.
Ohmmeter indicates continuity between all
windings.
Indicator swings to zero and slowly returns
toward infinity.
Indicator swings to zero and slowly returns
toward infinity.
Indicator swings to zero and slowly returns
toward infinity.
Indicator swings to zero and slowly returns
toward infinity.
Continuity
Open
Continuity
Continuity is indicated between circuit board
terminals and component connections.
If continuity is not indicated, replace wiring
before replacing electronic control board.
November 1998
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