Troubleshooting Ecm™ 142R Outdoor Fan Motors - Bard I-TEC Series 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.
VENT OPTION INTAKE/EXHAUST SPEEDS
1. In normal operation, this motor may rock back and
WIRE COLOR
forth on start up. Do not replace if this is the only
BLACK
symptom identified.
BLUE
2. If the system is operating properly, but the motor
ORANGE
appears to run slower than it should, the motor
RED
is good. High efficiency systems with optimized
fan blades are engineered to run slow to decrease
TO CHANGE SPEEDS, MOVE BROWN
noise. The Bard I-TEC Series models also adjust
WIRE WITH WHITE TRACE.
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:
COLORS: BRIGHT YELLOW
a. Ensure cleanliness of condenser coil(s) and
DARK ORANGE
fan blade/shroud.
WHITE BACKGROUND
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
FORM: DIECUT SHEET
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,
or if the outdoor air temperature is too cold
to raise the head pressure to the 325# switch
closing set-point, or the system charge is too
low, this could be the cause of the issue. (In
heat pump {heating} mode, the low ambient
fan cycling control is bypassed.)
d. If motor is not running, go to next section.
Manual 2100-578L
Page 36 of 42
4.250
2.585
142R Outdoor
TM
SPEED NOM. CFM
HI
HI 525
MED-HI 450
MED. HI
MED-LO 375
MED. LO
LO 300
LO
7961-755-2
MATERIAL:
PRINTING:
.833 .833
Do not operate motor without fan blade
attached. Such operations will cause the
motor to oscillate up and down.
You must obtain the correct replacement
motor from the manufacturer that is a direct
replacement for the failed motor.
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
7961-755
motor.
7961-755-4
• Line power is connected as follows:
Red wire connects to "L1"
Black wire connects to "L2"
Green/yellow wire connects to ground
OUTDOOR VINYL, SUPPLIER MUST BE CSA
• Control power is connected as follows:
APPROVED FOR ACCEPTABLE ADHESIVE
Blue wire connects to fan relay of the
NAMEPLATE LISTING.
defrost logic control, and subsequently
connects to 24VAC common through
BLACK
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 the 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.
It also utilizes the "B" reversing valve input for
heat pump mode to determine speed should
operate.
3.706
5.500
1.794
END USE: INDOOR/OU