SERVICING
103
L
INE VOLTAGE NOW PRESENT
WARNING
Check for line voltage on terminals 4 and 5. Verify terminal 3
is ground. Terminals 1 and 2 are jumpered in the harness for
120VAC operation.
5
4
3
2
1
Lines 1 and 2 will be connected
for 120VAC Power Connector
applications only
Gnd
AC Line Neutral Connection
AC Line Hot Connection
}
POWER CONNECTOR
(1/2 HP MOTORS)
"Motor Half“
(Viewed from Plug End)
5
4
3
2
1
Lines 1 and 2 will be connected
for 120VAC Power Connector
applications only
Gnd
AC Line Neutral Connection
AC Line Hot Connection
}
inductor
POWER CONNECTOR
(3/4 & 1 HP MOTORS)
"Motor Half“
(Viewed from Plug End)
8
7
6
5
4
3
2
1
16
15
14
13
12
11
10
9
OUT -
/-
Y 1
COOL
DELAY
COMMON 2
W/W1
COMMON 1
OUT +
G (fan)
Y/Y2
EM HT/W2
24VAC (R)
HEAT
BK/Pwm (Speed)
O (Rev Valve)
CONTROL CONNECTOR
"Motor Half“
(Viewed from connector end)
CAUTION
H
IGH
V
OLTAGE ON CONTROL PINS WILL DESTROY MOTOR
Do not apply 24 volts to terminals "Out +" or "Out -".
Make sure connector is fully seated.
Make sure pins are fully seated in connector housing.
Verify C1 and C2 are connected to transformer common.
Verify "R" is connected to transformer hot.
After verifying above connections, motor can be tested by
applying 24 volts to control pins. Example: R to G will cause
the fan to come at "Fan-Only" CFM, R to G to Y will cause
the fan to come on at cooling speed and R to G to W will
cause the fan to come on at heating speed.
If motor does not respond as noted, ICM control unit is bad
and should be replaced.
Replacing ICM Control Module
Use the following steps to replace the control module for the
GE
©
variable speed indoor blower motor.
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.
Remove all power from the unit being serviced. Do not
work on the motor with power applied. Wait at least 5
minutes after disconnecting power from the equipment
before opening the motor.
3.
It is usually not necessary to remove the motor from the
blower assembly. However it is recommended that the
whole blower assembly, with the motor, be removed.
Unplug the two cable connectors to the motor. There
are latches on each connector. Do not pull on the wires.
The plugs remove easily when properly released.
4.
Locate the two standard ¼" hex head bolts. Remove
these bolts from the motor while holding the control
module.
5. The control module is now free of the motor but still at-
tached by a plug and cable. Carefully rotate the control
so as to gain access to the plug on the end of the cable.
Squeeze the release latch and gently pull the plug out
of the control module. Do not pull on the wires. Grip the
plug only.