53
Constant Torque Motor
Troubleshooting
Does blower
wheel turn
freely?
Turn off power.
Check set screw
position and motor
bearings. Correct
or replace as
needed.
Check operation
NO
Is ~230 VAC measured
between terminals “L” &
“N” on the motor?
See Figure 1
YES
High voltage should
always be present.
Correct high voltage
wiring.
NO
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
YES
Replace motor.
Check operation
Motor does not run
Turn comfort to
“FAN ON” mode
Is 24VAC measured
from terminal 8(G) to
terminal 9(BL) on the
fan control?
NO
Correct wiring.
Check operation
NO
Replace fan control.
Check operation
YES
This terminal block is located on
the motor. Look for labels below
on the motor side of the
connection.
FIGURE 1
FIGURE 2
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.
CONSTANT TORQUE MOTOR TROUBLESHOOTING FOR GAM5
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