Manual 2100-578E
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
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.)
TROUblESHOOTING FAN lOGIC
CONTROl
Please reference the Thermistor Temperature/Resistance
Chart in this manual (Table 6).
• GREEN STATUS LED
–
Blinks indicating there
is a call for fan operation (simultaneous to call for
compressor operation) and is normal.
• RED STATUS LIGHT (LA)
–
Is illuminated when
low ambient control switch is in the closed position.
(NOTE: This is not required in heat pump operation
as the low ambient switch is bypassed in this mode
of operation.)
• YELLOW STATUS LIGHT (B)
–
Is illuminated
when there is a reversing valve call (for heat pump
operation). (NOTE: As mentioned above, this mode
of operation negates the low ambient fan cycling
control.)
If the board is reading a fan temperature thermistor
value of 3375Ω or less (equivalent to 125
°
F or an "open"
sensor), the fan will operate at the highest speed setting
(energizes "W" and "Y" outputs on the board).
If the board is reading a fan temperature value of
118,110Ω or greater (equivalent to -10
°
F or a "shorted"
sensor), the fan will operate at the highest speed setting
(energizes "W" and "Y" outputs on the board).
If the low ambient switch is open, the red light will not
be illuminated and the "BR" terminal will show open.
The "BR" terminal is the "24 volt common" switching
output to the outdoor fan motor.
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.
