Service manual

Part No. 80-1100-3 5-1
Section 5
Water System Ice Making Sequence of Operation
NOTE: The sequence of operation is the same for self-
contained and remote models.
INITIAL START-UP OR START-UP AFTER
AUTOMATIC SHUT-OFF
1. Before the ice machine starts, the water pump and
water dump solenoid are energized for 45 seconds
to purge old water from the water trough. This
ensures that the ice-making cycle starts with fresh
water. The water fill valve energizes after the 45-
second water purge, and remains on until the water
level probe is satisfied.
FREEZE CYCLE
2. To pre-chill the evaporator, there is no water flow
over the evaporator for the first 30 seconds of the
freeze cycle.
3. The water pump starts after the 30-second pre-chill.
An even flow of water is directed across the
evaporator and into each cube cell.
During the first 45 seconds of the Freeze Cycle, the
water fill valve cycles on and off as many times as
needed to refill the water trough.
After the 45 seconds, the water fill valve cycles on
and off one more time to refill the water trough. The
water fill valve then remains off for the duration of
the Freeze Cycle.
WATER INLET VALVE SAFETY SHUT-OFF
This feature limits the water inlet valve to a six-minute on
time. Regardless of the water level probe input, the
control board automatically shuts off the water inlet valve
if it remains on for 6 continuous minutes.
Figure 5-1. Water Flow Over the Evaporator
SV1677
TO DRAIN
WATER DUMP VALVE
TO DISTRIBUTION TUBE
WATER PUMP
WATER INLET VALVE