50
It is normal for the motor to rock back and forth
on start up. Do not replace the motor if this is the
only symptom identified.
If the system is working properly but the motor
appears to run slower than it should, the motor is
good. High efficiency systems, especially those
with optimized fan blades, will run the motor
slower to decrease noise.
If the system is noisy, freezing up, running a high
head pressure, tripping the high pressure switch
or the compressor overload, check the following:
Clean the condensing coil and any shrouds
thoroughly including in between two pass
coils (this may require some unit disassembly)
following the manufacturer’s recommendations.
This motor will not compensate for lack of airflow
through
dirty coils.
Confirm all fan blades are shaped the same,
in good condition and not rubbing on the shroud.
Also confirm the fan blade hub bolt is secure on
the motor shaft. Also confirm the motor is secure
in its mount and the mount legs are secure to
the unit.
Use the next section “If the motor is not
running” for voltage checks to determine if the
motor is getting the proper inputs.
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 inputs.
1.
2.
3.
4.
Models 142 and 142R ECM
Outdoor Fan Motor Diagnostics
See the Motor ID chart on page 7 if needed.
IF THE MOTOR IS RUNNING
OUTDOOR
M
OTO
R
