© 2009 Viking Preferred Service
22
Compressor
The compressor is the heart of the refrigeration
system. However, it also 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.
IMPORTANT
The compressor is protected from power
interruption with a start delay built into the
control to prevent high pressure startup
(see page 11, Operation - Selector Switch in the
“ON” Position). DO NOT MISTAKE THIS FOR A
FAULTY COMPRESSOR.
The following must also be observed before
concluding the compressor is faulty:
1. Low high side pressures, warm evaporator
plate, cool condenser coil, or little or very low
current draw from the unit will indicate a faulty
compressor.
2. Check for continuity between the compressor
terminals and the shell or chassis ground of
the compressor. If continuity is found, the
compressor is faulty and will need to be
replaced.
3. Check for resistance between all compressor
terminals. The resistance will vary from terminal
to terminal and from compressor to compressor
due to age and use. If no resistance is found,
the compressor is faulty and will need to be
replaced.
Compressor Removal
1. Disconnect power, water line, and drain line.
If a drain pump is used, it will need to be
disconnected and removed.
2. Remove back panel and lower shroud
(see
Figure 6
).
3. Remove grille by removing the two or
four screws (depending on grille style) and
disconnecting the three wires to rocker switch.
4. Remove drain valve (see page 25)
5. Remove water valve (see page 26).
6. Take out the screw that secures the top of the
electrical bracket located in the front of the
mechanical area (see
Figure 7
).
7. Remove the six screws that secures the
baseplate to the cabinet on the bottom of the
unit (see
Figure 8
).
8. Gently slide the mechanical out the back of
the unit just enough to gain access to the drier
assembly (see
Figure 8
).
9. Install sealed system access valve(s) and recover
refrigerant. After recovering, be sure to cap off
the access valve to prevent contamination of
the system.
10. Remove the cap from the back of the
compressor.
11. Disconnect the compressor overload and starter
relay at the compressor by pulling off. You will
need to disconnect the two wires from the old
overload and starter relay and then connect
the new one. The red (hot) wire goes on the
overload and the white (neutral) wire will go on
the starter.
12. Unbraze and remove the capillary tube from the
drier assembly.
13. Unbraze tube from hot gas valve at the tee
fitting on drier assembly (see
Figure 4
)
14. Unbraze and remove drier assembly.
15. Unbraze and remove suction line at compressor
(see
Figure 11
).
16. Unbraze hot gas discharge line at compressor
(see
Figure 11
).
17. Remove compressor by removing the two
lock-nuts on the mounting plate of the
compressor (see
Figure 11
). Lift compressor
off of the carriage bolts.
Service Diagnostics and Procedures
(Sealed System Components)
