Specifications

Manual 2100-549L
Page 56 of 59
Motor
Motor OK when
R > 100k ohm
ECM 2.0
Only remove
Hex Head Bolts
Connector Orientation
Between 4 and 8 o'clock
Drip Loop
Back of
Control
Figure 5
Winding Test
Figure 4
Note:
Use the shorter
bolts and
alignment pin
supplied when
replacing an
ECM 2.0
control.
Figure 3
ECM
2.3/2.5
Power Connector
(5-pin)
Control Connector
(16-pin)
Hex-head Screws
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
To replace the control module for the GE variable-speed indoor blower
motor you need to take the following steps:
1. You 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 t
he 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. Refer to
Figure 30.
5. Disconnect the three (3) wires interior of the motor control by
using your thumb and forefinger squeezing the latch tab and the
opposite side of the connector plug, gently pulling the connector.
DO NOT PULL ON THE WIRES, GRIP THE PLUG ONLY. Refer to
Figure 30.
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. Refer to Figure 31. (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 your
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 the steps #5, 4, 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 YOU SELECT
FOR REPLACING THE CONTROL ASSURES 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. Refer to Figure 32.
The installation is now complete. Reapply the 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 31
Figure 30
Figure 32