Ice Machine Operation | Section 3 |
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Sequence Of Operation
NOTE: The toggle switch must be in the ice position and the water curtain must be in place on the evaporator before the ice machine will start.
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(s) 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
When Used - The air compressor energizes for the last 10 seconds of the cycle.
2. Refrigeration System Start-Up
The compressor starts after the 45 second water purge, and it remains on throughout the entire Freeze and Harvest Sequences. The water fill valve is energized at the same time as the compressor. The harvest valve(s) remains on for 5 seconds during initial compressor start- up and then shuts off.
At the same time the compressor starts, the condenser fan motor
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.
NOTE: Freeze lock is bypassed after moving the toggle switch from OFF to ICE position for the first cycle only.
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