Manual 2100-578B
Page
37 of 41
Check Line Power to Motor
Check between Red and Black Wires for Line Power
Verify Ground by checking Green Wire to L1 and L2 Line Power
Check for 24VAC common signal to motor
(against Transformer "R" Signal)
Check "BR" terminal of Fan Logic Control Board
Check "Blue" Fan Lead on "Fan Relay Terminal" of "Defrost Logic Control"
** Is not energized in cooling mode until Low Ambient Fan Cycling Control is closed by 325
PSIG refrigerant pressure.
** Circuit is completed automatically when "B" is energized on the Fan Logic Control Board
Check 24VAC "hot" outputs (to "Blue" on Fan Logic Control) to motor. See the following tables based upon outdoor temperature and model
of operation.
O.D. Temp Sensor
24VAC Signals Between
Below 55°F
Orange to Blue
Between 56° - 69°F
White to Blue
Between 70° - 85°F
Yellow to Blue
Between 86° - 112°F
Orange and White to Blue
Above 112°F
White and Yellow to Blue
O.D. Temp Sensor
24VAC Signals Between
Above 56°F
Orange to Blue
Between 55° - 30°F
White to Blue
Between 29° - 14°F
Yellow to Blue
Below 13°F
Orange and White to Blue
TROUBLESHOOTING ECM™ 142R OUTDOOR FAN MOTOR
• Line power is connected as follows:
“Red Wire” connects to “L1”
“Black Wire” connects to “L2”
“Green/Yellow Wire” connects to “Ground”
• Control power is connected as follows:
“Blue Wire” connects to Fan Relay of the
Defrost Logic Control, and subsequently
connects to 24VAC Common through the
Fan Logic Control Board. “Yellow Wire”
connects to “Y” on the Fan Logic Control
Board. “White Wire” connects to “W” on
the Fan Logic Control Board. “Orange
Wire” connects to “O” on the Fan Logic
Control Board.
NOTE: A combination of the “Yellow”, “White”
and “Orange” wires being energized (with
24V “R” signal) determines five (5) different
speeds the fan motor will operate at. The
Fan Logic Control Board uses an outdoor
thermistor sensor to determine the speed the
fan should operate. It also utilizes the “B”
reversing valve input for heat pump mode to
determine speed should operate.
If the output signals are not matching the specified temperature range, then go to Table #6 and verify the thermistor output
curve. If the motor is receiving proper communications and proper high voltage power, and is still not running, proceed
with Motor Replacement. (When checking the resistance/temperature curve, don’t forget about the optional 2.2k ohm fan
control resistor assembly.)
TABLE 7
TROUBLESHOOTING ECM™ 142R OUTDOOR FAN MOTOR
TABLE 8
COOLING MODE
TABLE 9
HEAT PUMP MODE
REPLACING THE MOTOR
This motor is replaced in one piece. The control cannot
be replaced separately from the motor. Even if the
control is remotely located, the replacement part will be
a new control with harness and new motor.
You must have the correct replacement motor from the
manufacturer that is a direct replacement for the failed
motor.
USING THE WRONG MOTOR VOIDS
ALL PRODUCT WARRANTIES AND MAY
PRODUCE UNEXPECTED RESULTS.
Always mount the replacement motor and control
according to the manufacturers specifications using
all required hardware to reduce vibration. Make sure
all wires are free of the fan blade and not pinched in
mountings or cabinet through points.