Manual 2100-752B
Page
30 of 49
Only use 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.
Do not operate motor without fan blade
attached. Such operations will cause the
motor to oscillate up and down.
SERVICE
Troubleshooting ECM
TM
142R Outdoor
Fan Motors
2.585
.833
.833
3.706
1.794
4.250
5.500
7961-755-3
7961-755-3
MOTOR SPEEDS
7961-755-4
DISCONNECT ALL ELECTRICAL
IN SEVERE INJURY OR AMPUTATION.
EXPOSED MOVING PARTS.
WARNING
POWER BEFORE SERVICING.
T
HI
S D
OO
R
INTAKE VENT
FILTER BEHIND
WIRE WITH WHITE TRACE.
T
HI
S D
OO
R
!
SUPPLIES BEFORE SERVICING.
!
WARNING
7961-755-1
FAILURE TO DO SO CAN RESULT
7961-755-2
COLORS:
IN SERIOUS INJURY OR DEATH.
LO
DISCONNECT THE REMOTE
ELECTRIC POWER SUPPLY OR
MED. HI
WHITE BACKGROUND
MED. LO
VENT OPTION INTAKE/EXHAUST SPEEDS
BRIGHT YELLOW
NAMEPLATE LISTING.
BLACK
MATERIAL:
PRINTING:
FORM: DIECUT SHEET
END USE: INDOOR/OUTDOOR
7961-755
WIRE COLOR
SPEED
NOM. CFM
BLACK
BLUE
ORANGE
RED
HI
MED-HI
MED-LO
LO
525
450
375
DARK ORANGE
APPROVED FOR ACCEPTABLE ADHESIVE
300
TO CHANGE SPEEDS, MOVE BROWN
HAZARD OF ELECTRICAL SHOCK.
ELECTRICAL SHOCK CAN RESULT
HI
OUTDOOR VINYL, SUPPLIER MUST BE CSA
INTAKE VENT
FILTER BEHIND
7961-755
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.
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
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
dehum board
Pin #9 blue wire connects to B/W1
Pin #10 yellow/black wire connects to G1 on
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
