Viking vuim150 Service Notebook page 18

Low side tubing is found, the compressor, drier, and hot gas valve will need to be
replaced.
The temperature control thermistor sets on the bottom of the evaporator plate on a copper
bracket. This bracket should be checked at the solder joint. Any cracks will break the
proper thermal conductivity between the evaporator plate and the thermistor and result in
long production cycle with thick slab on the plate. The thermistor should also be secured
tight and have full contact to the copper bracket or thermal conductivity again will be
sacrificed.
Replacing the evaporator:
1. Disconnect power, water line, and drain line. If a drain pump is used, it will need to
be disconnected and removed.
2. Remove the door from the front of the unit.
3. Remove the escutcheon panel.
4. Remove the grid cutter (see section 6.1)
5. Remove the ice deflector.
6. Remove the reservoir (see section 6.2)
7. Remove the circulation pump (see section 6.3), hose, and distributor.
8. Remove the stainless steel evaporator thermister fastened on the bottom of the
evaporator with a stainless hex head or Phillips screw.
9. Remove the four screws securing the evaporator plate.
10. Remove the access panel and rear panel at the rear of the unit (see figure 3.3)
11. Remove the bin sensing tube with the bin thermistor remaining inside it. It is not
necessary to remove the bin thermistor from the sleeve. Remove through the opening
in the rear of the liner.
12. Remove the putty and the water line from the opening in the rear of the liner.
13. Remove the grille be removing the two screws and disconnecting the three wires to
the rocker switch. Be sure to mark where these wires go for re-assembly.
14. Remove the drain valve.
15. Remove the water valve.
16. Take out the two screws that secure the top of the electrical bracket located in the
front of the mechanical area (see figure 3.4).
17. Remove the six screws that secure the base plate to the cabinet on the bottom of the
unit (see figure 3.5).
18. Gently slide the mechanical out the rear of the unit just enough to gain access to the
assembly (see figure 3.6)
19. Install the access valve and recover refrigerant. After recovering, be sure to cap off
the access valve to prevent contamination of the system.
20. Remove the cap from the rear of the compressor.
21. Disconnect the PTC starter relay at the compressor by pulling off. You will not need
to disconnect the three wires.
22. Un-braze and remove the capillary tube from the drier assembly.
23. Un-braze the hot gas valve tube at the evaporator bypass tube (see figure 3.2)
24. Un-braze and remove the drier assembly at the condenser (see figure 3.1)
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