Viking vuim150 Service Notebook page 9

Upon setting the switch to the "ON" position, the water solenoid will energize for 1.5
minutes and then de-energize. When the bin thermistor senses temperature at or above
the "start ice" set point, and the evaporator thermistor senses temperature at or above
"production" set point, the production cycle will begin. The circulation pump, condenser
fan, and compressor relay will energize. When the evaporator thermistor senses
temperature at or below the "harvest" set point, the harvest cycle will begin. The
circulation pump and condenser fan outputs will be de-energized and the hot gas solenoid
and the drain solenoid will energize. The drain solenoid will remain energized for 45
seconds and then de-energize, after which the water solenoid will energize for 2.0
minutes and then de-energize. Loads will remain in this state until the evaporator
thermistor temperature rises to the "production" set point. Once the evaporator
thermistor temperature is at or above the "production" set point, a new production cycle
will begin. If at any time the bin thermistor senses a temperature at or below the "stop
ice" set-point, any production or harvest cycle in progress will continue until the harvest
cycle is complete. Once complete, all loads will de-energize and remain so until the bin
thermistor senses a temperature at or above the "start production" set point. A new
production cycle will then begin. During the first production cycle only (the switch was
previously in the "OFF" or "CLEAN" position), the evaporator thermistor temperature
will be ignored until the circulation pump has run for 2 minutes. During all harvest
cycles, the evaporator thermistor temperature cannot terminate the harvest cycle until the
water solenoid is de-energized. The grid cutter output will always be energized during
the harvest cycle, and for the first 35 minutes into the production cycle
If during any production cycle or harvest cycle, the selector switch is put into the
"CLEAN" position, and cycle in process will be immediately terminated and a clean
cycle will occur. The unit will now repeat the entire above cycle.
If during any production or harvest cycle, the selector switch is put into the "OFF"
position, the cycle in process will be stopped and all loads will de-energize and remain so
as long as the selector switch remains in the "OFF" position.
If during any production or harvest cycle, the selector switch is taken out of the "ON"
position, a lockout will be started during which the compressor relay will not re-energize
regardless of switch position.
If during any production or harvest cycle, there is a power loss/interruption of greater
than 25 milliseconds, a lockout delay will begin and the compressor relay will not re-
energize upon re-application of power until the lockout delay is complete. The lockout
delay begins with the loss of power and is unaffected by duration of power loss. All
other loads will operate normally during the lockout.
The set points are as follows:
Stop ice: 35.0° F. +/- 2° F.
Start ice: 43.0° F. +/- 2° F.
Harvest: 11.0° F. +/- 2°F.
Production: 45.0° +/- 2° F.
Set-point vs. Temperature and voltage (120VAC): +/- 3° F.
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