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COMPRESSOR WINDING TEST
(See Figure 2.)
Remove the compressor terminal box cover and
disconnect the wires from the terminals. Using
an ohmmeter, check continuity across the
following:
DISCONNECT ELECTRICAL POWER TO
THE UNIT BEFORE SERVICING OR
TESTING
COMPONENT OPERATION AND TESTING
WARNING
COMPRESSORS
Compressors are single phase, 208/230 volt. All
compressor motors are permanent split capacitor
type, using only a running capacitor across the
start and run terminal.
All compressors are internally spring mounted and
externally mounted on rubber isolators.
Line Voltage Overload
The compressor is equipped with an internal line
voltage overload. This overload is embedded in
the windings of the motor to sense the motor
temperature. The overload will open and
disconnect the power to the motor due to high
temperatures caused by:
1. A locked rotor.
2. Excessive running amps.
3. High discharge temperature.
4. Low refrigerant charge.
FIGURE 1 INTERNAL OVERLOAD
LINE BREAK
INTERNAL OVERLOAD
OHMMETER
FIGURE 2 COMPRESSOR WINDING TEST
Testing Procedures
1. Terminal "C" and "S" - no continuity -
open winding - replace compressor.
2. Terminal "C" and "R" - no continuity -
open winding - replace compressor.
3. Terminal "R" and "S" - no continuity
open winding - replace compressor.
4. Terminal "C" and the shell of the
compressor – continuity – grounded
motor – replace compressor.
5. Should continuity exist between
terminals "R" and "S", but not between
terminals "C" and "S" and "C" and "R",
the internal overload may be open. If
the compressor is extremely hot, allow
it sufficient time to cool. It may require
as long as one hour for the compressor
to cool sufficiently for the internal
overload to close.