Component Specifications
November 2001 RT4110048 Rev. 02
!WARNING
To avoid risk of electrical shock that can cause death or severe injury, disconnect unit from power and
discharge capacitor through a 10,000-ohm resistor before servicing, unless tests require power. Wires
removed during disassembly must be replaced on correct terminals to ensure proper grounding and
polarization.
Illustration Component Test Procedure Results
BT9266117 Compressor 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 information.
Ohmmeter should indicate resistance
between windings.
Ohmmeter should indicate resistance
between windings.
Ohmmeter should indicate infinity on each
terminal.
BT1243738
Continuity
Ensure temperature of overload is at room temp.
Check continuity across leads:
Overload should have continuity.
BT9457013
Capacitor Resistance (highest scale), with power removed.
Discharge capacitor and disconnect all attached wires.
Attach Analog ohmmeter leads between C terminal
and H terminal on capacitor:
Reverse leads on C and H terminals:
Repeat for terminals C and F of capacitor:
Check capacitor for ground.
Attach one ohmmeter lead to capacitor
case. Attach second ohmmeter lead to H,
then C, then F terminals on capacitor:
Indicator swings to zero and slowly returns
toward infinity.
Indicator swings to zero and slowly returns
toward infinity.
If capacitor responds to results above
capacitor is OK.
Infinity on ohmmeter indicates capacitor not
grounded.
BT1340012
Fan motor Check for resistance 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:
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:
Ohmmeter should indicate resistance
between windings.
Ohmmeter should indicate infinity on each
lead.
BT1370832
Selector switch See wiring diagram for specific terminal positions.
Position Function
1Off
2Fan
3Low Cool
4High Cool
5High Heat
6Low Heat
Contacts Made
None
L1 and H; L2 and 1
L1 and M; L2 and 1; HC and C
L1 and H; L2 and 1; HC and C
L1 and H, L2 and 1; HC and HT
L1 and M, L2 and 1; HC and HT
BT1370807 Thermostat Attach ohmmeter leads between 2 and 1:
Attach ohmmeter leads between 2 and 3:
Turn control to warmest setting. Check for
continuity. Contacts close when control
warms.
Turn control to coldest setting. Check for
continuity. Contacts close when control
cools.
If continuity is not indicated, replace
affected control.
