The compressor is the heart of the refrigeration system. However, it relies on other parts of the system
to function. Make certain that the other parts of the system are functioning correctly before determining
that the compressor is faulty.
The following tests should be conducted before concluding the compressor is faulty.
Low and high side pressure, temperature of compressor, discharge and suction lines, temperature
of air leaving the evaporator compartment, temperature of condenser coil, condenser fan opera-
tion, and amp draw at compressor.
Use a compressor start cord to isolate and test the compressor.
Use an ohmmeter to measure resistance / continuity at the compressor to check for shorted or
a. Resistance between the "Common" and "Run" terminals: this will be the lowest ohm reading
b. Resistance between the "Common" and the "Start" terminals: this will be the mid range ohm
c. Resistance between the "Start" and "Run" terminals: this will be the highest ohm reading ob-
d. No resistance between any two terminals signifies an open winding.
e. Check continuity between compressor terminals and the compressor itself (Scrap off a little paint
on compressor to make sure that resistance can be measured). If continuity is obtained, the com-
pressor is grounded and needs to be replaced.
5.2.1 Removal of the Compressor
1) Remove all screws around the perimeter of the cabinet. Do not remove the screws from the slot-
ted area. (See figure 12.3)
To loosen the rear of the mechanical assembly, remove both hex screws at each lower back cor-
ner (See figures 12.4).
3) Remove the two Phillips screws and remove the front grille (See figure 12.5).
To loosen the front of the mechanical assembly, remove both Phillips screws that secure the front
corners (See figure 12.6).
CAUTION, (See figures 12.7 & 12.8) before sliding out the mechanical assembly please read the
following carefully. To avoid kinking of any system tubing do not slide the mechanical section
forward farther then 6" maximum. Doing so may kink any or all of the following: discharge line
at the compressor,suction line at the compressor, suction line as it exits the rear of the cabinet.
SEE PHOTO SECTION FOR REFERENCE TO ABOVE MENTIONED FIGURES
2010 - Viking Preferred Service