Trane GAM5B0A18M11EB Installation, Operation And Maintenance Manual page 53

CONSTANT TORQUE MOTOR TROUBLESHOOTING FOR GAM5
NOTE: The fan control has a 90
second "OFF" delay that is
factory set on. To turn this
feature off, turn dip switch to 0
and cycle power to the unit.
Turn off power.
Check set screw
position and motor
bearings. Correct
or replace as
needed.
Check operation
High voltage should
always be present.
NO
Correct high voltage
wiring.
Correct wiring.
Check operation
NO
Is 24VAC measured
from terminal 8(G) to
NO
terminal 9(BL) on the
fan control?
YES
Replace fan control.
Check operation
Turn comfort to
"FAN ON" mode
Motor does not run
Does blower
NO wheel turn
freely?
YES
Is ~230 VAC measured
between terminals "L" &
"N" on the motor?
See Figure 1
YES
Is ~24 VAC measured
between the wire connected
to "C" on the motor and the
wire connected to terminal 1
thru 5 on the motor?
See Figure 2
YES
Replace motor.
Check operation
Constant Torque Motor
Troubleshooting
FIGURE 1
FIGURE 2
This terminal block is located on
the motor. Look for labels below
on the motor side of the
connection.
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