Troubleshooting Ecm 142R Outdoor Fan Motors; Manual 2100-597G - Bard I30A1DA Installation Instructions Manual

Troubleshooting ECM
Fan Motors
WARNING
• Exposed moving parts.
• Disconnect all electrical power before
servicing.
• Failure to do so can result in severe injury
or amputation.
WARNING
• Hazard of electrical shock.
• Electrical shock can result in serious
injury or death.
• Disconnect the remote electric power
supply or supplies before servicing.
1. In normal operation, this motor may rock back and
forth on start up. Do not replace if this is the only
symptom identified.
2. If the system is operating properly, but the motor
appears to run slower than it should, the motor
is good. High efficiency systems with optimized
fan blades are engineered to run slow to decrease
noise. The Bard I-TEC Series models also adjust
fan speed based upon varied outdoor ambient
conditions to optimize sound and unit efficiency.
3. If the system is noisy, freezing up, running a high
head pressure, tripping the high pressure switch or
compressor overload, check the following:
a. Ensure cleanliness of condenser coil(s) and
fan blade/shroud.
b. Confirm the fan blade is not bent or deformed,
isn't rubbing on the shroud, and that it is tight
on the motor shaft. Also ensure the motor
is secure in its mounting system, and the
mounting system is secure to the unit.
c. The Bard I-TEC is equipped with a low
ambient control pressure switch. This
pressure switch completes the 24VAC
Common feed to the outdoor fan motor control
in cooling mode. If this switch is defective,
the outdoor air temperature is too cold to raise
the head pressure to the 350# switch closing
setpoint or the system charge is too low, this
could be the cause of the issue.
d. If motor is not running, go to next section.

Manual 2100-597G

Page 62 of 68
142R Outdoor
TM
CAUTION
Do not operate motor without fan blade
attached. Such operations will cause the
motor to oscillate up and down.
CAUTION
The correct motor that is a direct replacement
for the failed motor must be obtained from the
manufacturer.
USING THE WRONG MOTOR VOIDS
ALL WARRANTIES AND MAY PRODUCE
UNEXPECTED RESULTS.
4. If the motor does not appear to be running at the
proper speed or does not shut off, refer to the
next section for voltage checks to determine if the
motor is getting the proper input signals.
If the motor IS NOT receiving any communication,
troubleshoot the communication issue using the
diagnostic table for the fan logic control.
a. This motor uses a 7-wire harness to control the
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 "BR" terminal
on the fan logic control board, 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 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.
* The common wire to the "BR" terminal is
interrupted by the low ambient control. This
will stop the condenser fan operation until liquid
pressure reaches 350#.