© 2009 Viking Preferred Service
20
Evaporator
The evaporator uses evaporating refrigerant to
remove heat from the water that flows over the
evaporator plate to form an ice slab. The ice slab
will simply slide down the evaporator plate onto the
cutter-grid during harvest.
The evaporator plate will over time have a
build-up of mineral deposits. The evaporator will
NOT need to be replaced due to the mineral
deposits. However, these deposits must be
removed periodically for proper ice machine
performance.
The evaporator must also be free of nicks and
scratches. A nice polished and smooth evaporator
will allow the ice machine to perform correctly,
giving the best performance by allowing the ice
slab to slide freely and allowing the water to have
proper evaporator to water contact. If nicks and
scratches are found, replacement is not needed.
Simply remove the nicks and scratches with fine
sanding material and then use a polish for stainless
steel.
If the evaporator has a leak, it should be replaced.
A leak detection device will confirm a leaking
evaporator assembly. REMEMBER, IF A LEAK IN
THE EVAPORATOR, ACCUMULATOR, OR 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 a long production
cycle with a thick slab on the plate. The thermistor
should be tightly secured and have full contact to
the copper bracket or thermal conductivity again
will be sacrificed.
Removing 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 door from front of unit.
3. Remove escutcheon panel.
4. Remove cutter-grid (see page 32).
5. Remove ice deflector.
6. Remove reservoir (see Reservoir section).
7. Remove circulation pump (see page 35), hose,
and distributor.
8. Remove evaporator thermistor fastened on
bottom of evaporator with a stainless hex head
or Phillips screw.
9. Remove the four screws securing the evaporator
plate.
10. Remove back panel and lower shroud
(see
Figure 6
).
11. Remove bin sensing tube with bin thermistor
remaining inside it. It is not necessary to remove
the bin thermistor from the sleeve. Remove
through opening in back of liner.
12. Remove putty and water line from opening in
back of liner.
13. Remove grille by removing the two screws and
disconnecting the three wires to rocker switch.
14. Remove drain valve (see page 25)
15. Remove water valve (see page 26).
16. Remove the screw that secures top of electrical
bracket located in front of mechanical area
(see
Figure 7
).
17. Remove the six screws that secure the baseplate
to the cabinet on the bottom of the unit
(see
Figure 9
).
Service Diagnostics and Procedures
(Sealed System Components)
