4
FIGURE 1 COMPRESSOR WINDING TEST
DISCONNECT ELECTRICAL POWER TO
THE UNIT BEFORE SERVICING OR
TESTING
COMPONENT OPERATION AND TESTING
WARNING
FIGURE 2 TYPICAL GROUND 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.
COMPRESSOR WINDING TEST
(See Figure 1.)
Remove the compressor terminal box cover
and disconnect the wires from the terminals.
Using an ohmmeter, check continuity across
the following:
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.
Summary of Contents for 2001 Hazardgard SH14J30A-1
Page 14: ...14 WIRING DIAGRAM FOR SH14J30A SH20J30A...
Page 15: ...15 Hazardgard Cabinet Parts...
Page 16: ...16 Hazardgard Chassis Parts...
