Table of Contents
Advertisement
Ice Machine Operation
INITIAL START-UP OR START-UP AFTER
AUTOMATIC SHUT-OFF
1. Water Purge
Before refrigeration begins 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.
FREEZE SEQUENCE
2. Prechill
The suction line solenoid is on (refrigerant starts to
flow) for 30 seconds prior to water flow, to prechill
the evaporator. The water fill valve turns on and
remains on until the water level probe is satisfied.
3. 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 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.
3-2
Ice Making Sequence of Operation
HARVEST SEQUENCE
4. Water purge
The water pump continues to run and the water dump
valve energizes for 45 seconds, to purge the water in
the sump trough. The water fill valve energizes for
the last 15 seconds of the 45-second water purge.
After the 45 second water purge, the water pump,
water fill valve, and water dump valve de-energize.
The evaporator heaters energize at the beginning of
the water purge, to warm the evaporator.
The suction line solenoid de-energizes at the
beginning of the water purge, to stop refrigerant flow
into the evaporator.
5. Harvest
The evaporator heaters remain energized to warm the
evaporator, causing the cubes to slide as a sheet off
the evaporator and into the storage bin. The sliding
sheet of cubes swings the water curtain out, opening
the bin switch. The momentary opening and re-
closing of the bin switch terminates the harvest
sequence and returns the ice machine to the freeze
sequence (steps 2-3).
AUTOMATIC SHUT-OFF
6. AUTOMATIC SHUT-OFF
When the storage bin is full at the end of a harvest
sequence, the sheet of cubes fails to clear the water
curtain and will hold it open. After the water curtain
is held open for 7 seconds, the ice machine shuts off.
The ice machine remains off until enough ice has
been removed from the storage bin to allow the ice to
fall clear of the water curtain. As the water curtain
swings back to the operating position, the bin switch
re-closes and the ice machine restarts (step 1).
Section 3
Advertisement
Table of Contents
