36
EN
Furnaces
7.9 Servicing the motor
Perform the steps in Accessing the furnace components (on page 30) before proceeding with service.
Tighten the Motor Mount
32
Blower Wheel
Locator Tab
Motor Clamp
Motor
➤ Follow the procedure to Replace the Blower
Wheel until the motor is visible.
➤ Tighten the screw on the motor clamp. Newer
models do not have a motor clamp in the motor
repair kit. Motors are designed with wires.
➤ Reverse the steps to reassemble the housing.
Check the Amp Draw
33
Relay
For models with an external relay:
➤ To measure the DC amperage of the motor,
perform one of the following tasks:
– Confirm the voltage is between 10 and 13.5 VDC.
– Place an (DC) amp clamp around the motor
wire as the motor is running.
– Perform an in-line test:
• Disconnect the motor wire off of the relay.
• Connect the motor wire to one meter lead
then touch the other meter lead to the
relay to start the motor.
I
The motor must be running to get an amp
draw reading.
• Read the amps.
I
Some multi-meters will not start the motor. In
this circumstance, an amp draw reading will
not be possible.
34
Terminal
For all other models:
➤ To measure the DC amperage of the motor,
perform one of the following tasks:
– Confirm the voltage is between 10 and 13.5 VDC.
– Place an (DC) amp clamp around the motor
wire as the motor is running.
– Perform an in-line test:
• Disconnect the motor wire off of the motor
terminal on the circuit board.
• Connect the motor wire to one meter lead
then touch the other meter lead to the motor
terminal on the board to start the motor.
I
The motor must be running to get an amp
draw reading.
• Read the amps.
I
Some multi-meters will not start the motor. In
this circumstance, an amp draw reading will
not be possible.
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