Component
Testing
©2007 Viking Preferred Service
27
Component Description
Test
Procedures
Compressor
Operation test
If voltage, capacitor, overload, and motor winding
tests do not show cause for failure, perform the
following test:
1. Disconnect power to refrigerator.
2. Discharge capacitor by shorting capacitor
terminals through a resistor.
3. Remove leads from compressor terminals.
4. Wire a test cord to power switch.
5. Place time delayed fuse with UL rating equal to
amp rating of motor in test cord socket. (Refer to
Technical Data Sheet.)
6. Remove overload and relay.
7. Connect start, common and run leads of test
cord on appropriate terminals of compressor.
8. Attach capacitor leads of test cord together. If
capacitor is used, attach capacitor lead to a
known good capacitor of same capacity.
To AC Supply
Switch
R
S
Compressor
Capacitor
Fuses
C
9. Plug test cord into multimeter to determine start
and run wattage and to check for low voltage,
which can also be a source of trouble
indications.
10. With power to multimeter, press start cord
switch and release.
•
If compressor motor starts and draws normal
wattage, compressor is okay and trouble is in
capacitor, relay/overload, freezer temperature
control, or elsewhere in system.
•
If compressor does not start when direct wired,
recover refrigerant at high side. After refrigerant
is recovered, repeat compressor direct wire test.
If compressor runs after recovery but would not
run when direct wired before recover, a
restriction in sealed system is indicated.
•
If compressor does not run when wired direct
after recovery, replace faulty compressor.
