TRUE ICE truemfg.com
TEC_TM_171 | REV. G | EN
P#224534
02/28/2024 Page 48 of 72
Ice Machine Operation (cont.)
USER ACTION!
Before the ice machine will start MAKE ICE must be pressed and the ice damper must be in place.
Sequence of Operation
NOTICE!
Anytime the ice machine is in the OFF or FULL BIN state, the ice machine will drain water until the sump is empty.
Startup Cycle
The startup cycle consists of the self-diagnostic and refrigeration startup sequences.
Self-Diagnostics
Upon startup, the ice machine performs a series of self-diagnostic tests to ensure proper operation of critical components. During this brief
period the ice machine will fill and drain with water. This tests component operations as well as helps rid the ice machine of undesirable
sediment from the sump.
Refrigeration Startup
The ice machine will then energize the harvest valve and start the refrigeration system in the HARVEST cycle. This is to ensure no ice
remains on the evaporator before the ice machine enters the FREEZE cycle.
Freeze Cycle
The water pump energizes, and water is circulated over the evaporator that is being chilled by the refrigeration system. As more heat is
removed from the water, it begins to freeze and build ice on the evaporator. As the cycle continues the ice grows thicker and the water
level in the sump begins to drop. Once enough water is frozen to form a full sheet of ice the water level is low enough that the water level
sensor will initiate the HARVEST cycle. The water pump and fan motor(s) will de-energize.
Harvest Cycle
The harvest valve, drain valve and water inlet valve energize, which allows sediment to drain and starts to refill the sump water for the next
cycle. As hot refrigerant flows into the evaporator, it begins to warm the evaporator enough to release ice from the evaporator. The ice will
fall and contact the damper door at the bottom of the evaporator. The damper will pivot down to an open position and, if the ice storage
unit is not full, the damper will pivot back up to closed position. This signals the ice machine to start another FREEZE cycle. The ice machine
will continue to repeat the FREEZE and HARVEST cycles until the ice storage unit is full.
Full Bin
When the ice storage unit is full, the sheet of ice will prevent the damper door from pivoting back up to a closed position. After several
seconds of the damper remaining open, the ice machine will shut off and display FULL BIN. The drain valve will energize and drain the
remaining water from the sump to prevent sediment build-up. Once the ice melts or ice is removed from the ice storage unit, the damper
will pivot back to a closed position and the ice machine will restart in the STARTUP cycle.
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