Manual 2100-549Q
Page
64 of 69
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. Above 65°F outdoors in cooling mode, the low ambient control is bypassed.
** 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.
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.
The correct replacement motor from the manufacturer
that is a direct replacement for the failed motor must
be used.
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.
Troubleshooting Fan Logic Control
Please reference the Thermistor Temperature/
Resistance Chart on page 61 (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. Low ambient switch is
also negated in cooling mode above 65°F outdoor
temperature.)
• 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.
If the output signals are not matching the specified
temperature range, then go to Table #6 on page 61
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 Motors
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
TABLE 8
Cooling Mode
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
TABLE 9
Heat Pump Mode
