Manual 2100-586G
Page
25 of 25
Motor
Motor OK when
R > 100k ohm
Connector Orientation
Between 4 and 8 o'clock
Drip Loop
Back of
Control
Winding Test
ECM
2.3/2.5
Power Connector
(5-pin)
Control Connector
(16-pin)
Motor Connector
(3-pin)
Motor Connector
(3-pin)
Control Disassembly
Drip Loop
Push until
Latch Seats
Over Ramp
From Motor
Circuit
Board
Replacing ECM Control Module
The following steps must be taken to replace the control module
for the GE variable-speed indoor blower motor:
1. MUST have the correct replacement module. The controls
are factory programmed for specific operating modes.
Even though they look alike, different modules may have
completely different functionality.
Using the wrong control module voids all product warranties
and may produce unexpected results.
2. Begin by removing AC power from the unit being serviced.
Do not work on the motor with AC power applied.
To avoid
electric shock from the motor’s capacitors, disconnect power
and wait at least 5 minutes before opening motor.
3. It is not necessary to remove the motor from the blower
assembly, nor the blower assembly from the unit. Unplug the
two cable connectors to the motor control assembly. There
are latches on each connector.
Do not pull on the wires.
The
plugs remove easily when properly released.
4. Locate the screws that retain to the motor control bracket
to the sheet metal of the unit and remove them. Remove
two (2) nuts that retain the control to the bracket and
then remove two (2) nuts that retain sheet metal motor
control end plate (see Figure 10).
5. Using thumb and forefinger to squeeze the latch tab and
the opposite side of the connector plug and gently pulling
the connector, disconnect the three (3) wires interior of
the motor control.
Do not pull on the wires; grip the plug
only.
See Figure 10.
6. The control module is now completely detached from
the motor. Verify with a standard ohmmeter that the
resistance from each motor lead (in the motor plug just
removed) to the motor shell is >100K ohms (see Figure
11). (Measure to unpainted motor end plate.) If any motor
lead fails this test, do not proceed to install the control
module;
the motor is defective and must be replaced.
Installing the new control module will cause it to fail also.
7. Verify that the replacement control is correct for the
application. Refer to the manufacturer’s authorized
replacement list.
Using the wrong control will result
in improper or no blower operation.
Orient the control
module so that the 3-wire motor plug can be inserted into
the socket in the control. Carefully insert the plug and
press it into the socket until it latches.
A slight click will
be heard when properly inserted.
8. Reverse Steps #5, 4 and 3 to reconnect the motor control
to the motor wires, securing the motor control cover plate,
mounting the control to the bracket and mounting the
motor control bracket back into the unit.
Make sure the
orientation selected for replacing the control ensures the
control’s cable connectors will be located downward in
the application so that water cannot run down the cables
and into the control. Do not overtighten the bolts.
9. Plug the 16-pin control plug into the motor. The plug is
keyed. Make sure the connector is properly seated and
latched.
10. Plug the 5-pin power connector into the motor. Even
though the plug is keyed,
observe the proper orientation.
Do not force the connector.
It plugs in very easily
when properly oriented.
Reversing this plug will cause
immediate failure of the control module.
11. Final installation check. Make sure the motor is installed as
follows:
a. Motor connectors should be oriented between the 4
o’clock and 8 o’clock positions when the control is
positioned in its final location and orientation.
b. Add a drip loop to the cables so that water cannot
enter the motor by draining down the cables (see
Figure 12).
The installation is now complete. Reapply AC power to the
HVAC equipment and verify that the new motor control module
is working properly. Follow the manufacturer’s procedures for
disposition of the old control module.
Figure 11
Figure 10
Figure 12
