Service manual

SERVICING
42
WARNING
LINE VOLTAGE NOW PRESENT
Check for line voltage on terminals 4 and 5. Verify terminal
3 is ground. Terminals 1 and 2 should be connected only if
motor is operating on 120 Volts.
1
2
3
4
5
Lines 1 and 2 will be connected
for 12OVAC Power Connector
applications only
Gnd
AC Line Connection
AC Line Connection
}
POWER CONNECTOR
"Motor Half"
Control connections
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
fan to come at "Fan-Only" CFM. R to G to Y will cause fan
to come on at cooling speed.
If motor does not respond as noted, ECM control unit is
bad and should be replaced.
8
7
6
5
4
3
2
1
16
15
14
13
12
11
10
9
OUT -
ADJUST +/-
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“
CAUTION
High Voltage on Control Pins will Destroy Motor
Replacing ICM Control Module
Use the following steps to replace the control module for
the GE
©
variable speed indoor blower motor.
Power
Conditionin
g
AC to DC
Conversion
Inverter
Motor
Control
ECM
Blower
Motor
HVAC System Control
INPUTS
24 Volts A/C
Compressor
On/Hi/Low
Fan On
Reversin
g
Valve
Aux./Emer
g
ency Heat
Capacity Select
Outputs
CFM Demand
ICM/ECM CONTROL FLOW CHART