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SERVICE
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
WIRE COLOR
BLACK
BLUE
Do not operate motor without fan blade
ORANGE
attached. Such operations will cause the
RED
motor to oscillate up and down.
TO CHANGE SPEEDS, MOVE BROWN
WIRE WITH WHITE TRACE.
Only use the correct replacement motor from
the manufacturer that is a direct replacement
for the failed motor.
COLORS:
BRIGHT YELLOW
DARK ORANGE
USING THE WRONG MOTOR VOIDS
WHITE BACKGROUND
ALL WARRANTIES AND MAY PRODUCE
UNEXPECTED RESULTS.
FORM: DIECUT SHEET
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 Q-TEC Series models also adjust
fan speed based upon varied outdoor ambient
conditions to optimize sound and unit efficiency.
Manual 2100-752B
Page
30 of 49
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
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 Q-TEC may be 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 325# switch closing set point
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.
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.
Power is connected with a 5-pin plug:
Pin #4 red wire connects to L1
Pin #5 black wire connects to L2
Pin #3 green wire connects to ground
7961-755
7961-755-4
b. This motor uses a 16-pin plug to control motor
speed in constant CFM operation:
Pins #1 & 3 black/white wire connects to COM
Pin #6 yellow/white wire connects to Y0 on
OUTDOOR VINYL, SUPPLIER MUST BE CSA
dehum board
APPROVED FOR ACCEPTABLE ADHESIVE
Pin #9 blue wire connects to B/W1
NAMEPLATE LISTING.
Pin #10 yellow/black wire connects to G1 on
BLACK
dehum board
Pin #12 red/white wire connects to R
Pin #13 brown wire connects to W2 on dehum
board
Pin #14 purple wire connect to pin 1 on vent
plug
Pin #15 orange wire connects to G
3.706
5.500
1.794
END USE: INDOOR/OU
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Troubleshooting
