508034-02
Issue 2135
Page 12 of 49
Prove Switch
Combustion Air Inducer
Figure 8. Combustion Air Inducer and Prove Switch
Figure 9. Pressure Switch
Blower Compartment
Each blower is statically and dynamically balanced as
an assembly before installation in the unit.
IMPORTANT
95G1UHEX units are equipped with a constant torque
ECM motor. It has a DC motor coupled to an electronic
control module both contained in the same motor housing.
The motor is programmed to provide constant torque at
each of the five selectable speed taps. Each tap requires
24 volts to energize.
Input Voltage Requirements
The circuit is designed to be operated with AC voltage. To
enable a tap requires 12 to 33VAC. Expected current draw
will be less than 20mA.
Troubleshooting the Motor
Troubleshooting the motor is an easy process. Follow
steps below.
1.
Shut off power to unit.
2. Remove input plugs P48 and P49 from motor. See
Figure 17 for troubleshooting procedure.
If correct voltage is present in tests 1 and 2 and motor is
not operating properly, replace motor. The motor is not field
repairable.
If replacing the indoor blower motor or blower wheel is
necessary, placement is critical. The blower wheel must
be centered in the blower housing as shown in Figure 10.
When replacing the indoor blower motor the set screw
must be aligned and tightened with the motor shaft as
Center Blower Wheel
in Blower Housing
Figure 10. Blower Wheel Replacement
Set Screw
Housing Hub
ALIGN AND TIGHTEN SET SCREW WITH
FLAT SIDE OF MOTOR SHAFT
Motor
Shaft
Figure 11.
Secondary Limits
Figure 12. Secondary Limit Control
Replacing the Motor Module
1. Disconnect electrical power to unit.
2. Remove unit access panel.
3. Unplug the two harnesses from the motor control