Specifications

Ice Machine Operation Section 3
3-2
Part No. 80-1175-3, 6/03
Ice Making Sequence of Operation
INITIAL START-UP OR START-UP AFTER
AUTOMATIC SHUT-OFF
1. Water Purge
Before the compressor starts, the water pump and water
dump solenoid are energized for 45 seconds, to
completely purge the ice machine of old water. This
feature ensures that the ice making cycle starts with
fresh water.
The cool vapor solenoid is also energized during water
purge, although it stays on for an additional 5 seconds
(50 seconds total on time) during the initial refrigeration
system start-up.
2. Refrigeration System Start-Up
Ice Machine Head Section: The liquid line solenoid
valve starts after the 45 second water purge, and it
remains on throughout the entire Freeze and Harvest
Sequences. The cool vapor solenoid valve remains on
for 5 seconds during initial compressor start-up and then
shuts off.
The water fill valve is energized at the same time as the
liquid line solenoid valve.
CVD Condensing Unit: When the refrigerant pressure
is high enough to close the low-pressure control, (after
cool vapor valve energizes in step 1) the contactor coil is
energized and the compressor starts. The compressor
and fan cycling control* are supplies with power
throughout the entire Freeze and Harvest Sequences.
When the refrigerant pressure is high enough to close
the fan cycling pressure control the condenser fan motor
starts.
* The Q0600C ice machine does not use a fan cycling
control. The compressor and the condenser fan motor
are wired through the contactor. Any time the
contactor coil is energized, these components are
supplied with power.
FREEZE SEQUENCE
3. Prechill
The compressor is on for 30 seconds prior to water flow,
to prechill the evaporator. The water fill valve remains on
until the water level probe is satisfied.
4. Freeze
The water pump restarts after the 30 second prechill. An
even flow of water is directed across the evaporator and
into each cube cell, where it freezes. The water fill valve
will cycle on and then off one more time to refill the water
trough.
When sufficient ice has formed, the water flow (not the
ice) contacts the ice thickness probe. After
approximately 7 seconds of continual water contact, the
harvest sequence is initiated. The ice machine cannot
initiate a harvest sequence until a 6 minute freeze lock
has been surpassed.
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