Trane S8B1A040M3PSC Installation, Operation And Maintenance Manual page 76

T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g
Con nuous FAN on this unit is limited to TAP 1
only. No field adjustment can be made. If
troubleshoo ng other speed taps, use the
method as outlined below using the voltages
listed for the tap number being used
1. Remove the 6-pin low voltage
connector from the IFC
2. Apply 24 VAC to Common tap (Blue)
and any speed tap on the CTM motor
6-pin plug. The motor should run.
BK W2 W1 R G B/C Y2 Y1 O
9 Tap CTM Voltages
76
Segment LED's are ON with no ac ve error codes
Turn fan to ON at thermostat and verify that COF and
TP1 alternately appear on the seven segment display
Motor & IFC are
good
6-Pin low volltage
6 Pin CTM
CTM motor connector plug
Connector
6 Pin CTM Motor
Connector
Tap 1 - Low Speed
Tap 2
Tap 3
Tap 4
Tap 5 - High Speed
Common
Constant Torque Motor
Troubleshoo ng
Ensure power is applied to the unit and Seven
YES Does motor run?
NO
Verify voltage(s)
listed
If voltage is not present, remove 6 pin
connector from IFC and re-check. If voltage is
present, verify voltage at panel connectors and
at motor. If voltage is present at the motor,
replace motor
~ 8 VDC
VOLTS A.C.
120 VAC
VOLTS A.C.
3 2 1
5 4
C
CONTROL
CONNECTION
CONTROL
CONNECTION
3 2 1
5 4
C
POWER
CONNECTION
L G N
S8XB-SVX001-1B-EN
L G N
POWER
CONNECTION