Figure 21 Control Disassembly; Figure 22 Winding Test; Figure 23 Drip Loop - Bard I-TEC Series Installation Instructions Manual

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 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. Refer to Figure 21.
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 21.
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 22.
(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.
Figure 21
Control Disassembly
From Motor
Push until
Latch Seats
Over Ramp
Circuit
Board
Motor
Motor Connector
(3-pin)
ECM
Control Connector
2.3/2.5
(16-pin)
Power Connector
(5-pin)
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
23.
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 22
Winding Test
Motor Connector
(3-pin)
Motor OK when
R > 100k ohm
Figure 23
Drip Loop
Connector Orientation
Back of
Control
Between 4 and 8 o'clock
Drip Loop
Manual 2100-578L
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