Viking VCBF036RSS Service Manual page 22

Component Testing
Component Description
Compressor
22
Test Procedures
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
Fuses
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.
©2007 Viking Preferred Service
Switch
Compressor
S
C
R
Capacitor