SERVICING
14
Resistance Check
WARNING
High Voltage!
Disconnect all power before servicing or
installing. Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death.
1. Discharge capacitor and remove wire leads.
WARNING
Discharge capacitor through a 20 to 30 OHM resistor before
handling.
Testing Capacitor Resistance
2. Set an ohmmeter on its highest ohm scale and
connect the leads to the capacitor -
A. Good Condition - indicator swings to zero and
slowly returns to infinity. (Start capacitor with
bleed resistor will not return to infinity. It will still
read the resistance of the resistor.)
B. Shorted - indicator swings to zero and stops
there -replace.
C. Open - no reading - replace. (Start capacitor
would read resistor resistance.)
Capacitance Check
WARNING
Discharge capacitor through a 20 to 30 OHM resistor before
handling.
Using a hookup as shown below, take the amperage and
voltage readings and use them in the formula:
Capacitance (MFD) = 2650 X Amperage
Voltage
Testing Capacitance
Checking Fan And Blower Motor Windings
(P
SC
Motors)
The auto reset fan motor overload is designed to protect
the motor against high temperature and high amperage
conditions by breaking the common circuit within the motor,
similar to the compressor internal overload. However, heat
generated within the motor is faster to dissipate than the
compressor, allow at least 45 minutes for the overload to
reset, then retest.
WARNING
High Voltage!
Disconnect all power before servicing or
installing. Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death.
1. Remove the motor leads from its respective
connection points and capacitor (if applicable).
2. Check the continuity between each of the motor
leads.
3. Touch one probe of the ohmmeter to the motor frame
(ground) and the other probe in turn to each lead.
