Ice Machine Operation
Section 3
3-4
Part Number 000002477 3/08
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 harvest valve and air compressor (when used) are
also energized during water purge, although they stay
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 energizes after the 45 second water purge, and
remains on throughout the entire Freeze and Harvest
Sequences. The harvest valve and air compressor
(when used) 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
the harvest valve energizes in step 1) the contactor coil
is energized and the compressor starts. The compressor
and fan cycling control* are supplied 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 IB0600C & S0600C ice machines do 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 (60 seconds initial
cycle) 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 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 10 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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