© 2009 Viking Preferred Service
12
Operation
Selector is in the “ON” Position
IMPORTANT:
The assumptions before proceeding
are: water is supplied to ice machine (see Water
Requirements page 10), proper electrical
power supplied to ice machine (see Electrical
Requirements page 10), drain is properly plumbed
or drain pump is operating properly, and bin and
evaporator thermistors are not defective.
Input power must be applied at all times for proper
operation. Any interrupt will lockout compressor for
no less than seven minutes and up to nine minutes
and restart the mode of operation.
Figure 2
is
the Timing Diagram/Operation for the electronic
control chart.
Upon setting switch to “ON” position, water
solenoid will energize for one and a half minutes
and then de-energize. When bin thermistor senses
temperature at or above “start ice” setpoint, and
evaporator thermistor senses temperature at or
above “production” setpoint, production cycle will
begin. The circulation pump, condenser fan, and
compressor relay will energize. When evaporator
thermistor senses temperature at or below
“harvest” setpoint, harvest cycle will begin. The
circulation pump and condenser fan outputs will
be de-energized and hot gas solenoid and drain
solenoid will energize. The drain solenoid will
remain energized for 45 seconds and then
de-energize, after which water solenoid will
energize for two minutes and then de-energize.
Loads will remain in this state until evaporator
thermistor temperature rises to “production”
setpoint. Once evaporator thermistor temperature
is at or above “production” setpoint, a new
production cycle will begin. If at any time bin
thermistor senses a temperature at or below “stop
ice” setpoint, any production or harvest cycle in
process will continue until harvest cycle is complete.
Once complete, all loads will de-energize and
remain so until bin thermistor senses a temperature
at or above “start production” setpoint. A new
production cycle will then begin. During the first
production cycle only (switch was previously in
“OFF” or “CLEAN” position), evaporator thermistor
temperature will be ignored until circulation
Bin Full
CLEAN CYCLE - 1 HOUR
Start up
= Circuit ON
= Circuit OFF
Selector Switch
ON
OFF
CLEAN
Grid Cutter Transformer
ON
OFF
Water Pump
ON
OFF
Condensor Fan
ON
OFF
Hot Gas Valve
ON
OFF
Drain Valve
ON
OFF
Water Valve
ON
OFF
Compressor
ON
OFF
Selector
Cutter Grid
Water Pump
Condensor Fan
Hot Gas Valve
Drain Valve
Water Valve
Compressor
Selector
Cutter Grid
Water Pump
Condensor Fan
Hot Gas Valve
Drain Valve
Water Valve
Compressor
1st
Harvest
1st
Production
2nd
Harvest
2nd
Production
30 min.
33 min.
30.75 min.
23.25 min.
3 min.
22.5 min.
10 min.
3.75 min.
3 min.
3 min.
2
2
2
2
3 min.
13.25 min.
75s
45s
45s
75s
35 min.
35 min.
35 min.
Figure 2
(Timing Diagram/Operation for electronic control)
