174 Part Number STH025 11/16
Prechill & Freeze Cycle Operation
The water inlet valve energizes and de-energizes in
conjunction with the water level probe located in the
water trough.
• The water inlet valve is ON when there is no water in
contact with the water level probes.
• The water inlet valve turns OFF after water contacts
the water level probes for 6 continuous seconds.
• The water inlet valve can cycle ON and OFF once in
the prechill and up to two times in the freeze cycle.
• Maximum fill time is:
Single evaporator 12.5 minutes
Dual evaporator 16.5 minutes
The water inlet valve energizes in the Prechill cycle and
will de-energize if water touches the high level probe (in
most instances the water trough can’t fill in the prechill
cycle and the water inlet valve will remain energized
into the freeze cycle). The water inlet valve will remain
energized until water contacts the high water probe. The
water inlet valve will cycle ON, and then OFF one more
time to refill the water trough. The water inlet valve is
now OFF for the duration of the freeze cycle.
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