5.2 Compressor
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.
1)
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.
2)
Use a compressor start cord to isolate and test the compressor.
3)
Use an ohmmeter to measure resistance / continuity at the compressor to check for shorted or
grounded windings.
a. Resistance between the “Common” and “Run” terminals: this will be the lowest ohm reading
obtained.
b. Resistance between the “Common” and the “Start” terminals: this will be the mid range ohm
reading obtained.
c. Resistance between the “Start” and “Run” terminals: this will be the highest ohm reading ob-
tained.
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)
2)
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).
4) To loosen the front of the mechanical assembly, remove both Phillips screws that secure the front
corners (See figure 12.6).
5)
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
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2010 - Viking Preferred Service
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Summary of Contents for DFUW244CL
Page 6: ...Section 1 Introduction to Dual Zone 2010 Viking Preferred Service SMR 0005 ...
Page 10: ...Section 2 Dual Zone Characteristics 2010 Viking Preferred Service SMR 0005 ...
Page 16: ...Section 3 Refrigeration Systems 2010 Viking Preferred Service SMR 0005 ...
Page 27: ...Section 4 TruProtect Control Diagnostics 2010 Viking Preferred Service SMR 0005 ...
Page 30: ...Section 5 Mechanical System Components 2010 Viking Preferred Service SMR 0005 ...
Page 38: ...Section 6 Structural Components 2010 Viking Preferred Service SMR 0005 ...
Page 42: ...Section 7 Electrical Components 2010 Viking Preferred Service SMR 0005 ...
Page 50: ...Section 8 Control Components 2010 Viking Preferred Service SMR 0005 ...
Page 54: ...Section 9 Wiring 2010 Viking Preferred Service SMR 0005 ...
Page 57: ...52 J110 J111 J112 J2 J1 J4 J7 J3 9 3 Main Power Board 2010 Viking Preferred Service SMR 0005 ...
Page 58: ...9 4 User Interface 53 2010 Viking Preferred Service SMR 0005 ...
Page 59: ...Section 10 Reference Charts 2010 Viking Preferred Service SMR 0005 ...
Page 64: ...Section 11 Trouble Shooting Guide 2010 Viking Preferred Service SMR 0005 ...
Page 68: ...Section 12 Reference Photos 2010 Viking Preferred Service SMR 0005 ...
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