Sub-Zero UC-15I - Manual (Page 20)

20
S E Q U E N C E O F O P E R AT I O N
Depending on ambient conditions and cold
water supply temperature, the ice making
process will take approximately 30 minutes.
1) Initial Start-Up or Start-Up After
Automatic Shut-Off — Water Fill
Before the compressor starts, the water inlet
valve will purge old water from the system for
about 3 minutes.
2) Refrigeration System Start-Up
The compressor starts after the Water Fill cycle
and remains on throughout the Freeze and
Harvest cycles. The condenser fan motor starts
and runs throughout the Freeze cycle.
3) Freeze
The water pump sprays water into the inverted
cups.
The water freezes layer by layer, until an ice
cube forms in each cup. The control system
will adjust the length of the Freeze cycle to
conditions.
4) Harvest
The water pump shuts off and the water inlet
valve starts up to assist harvest and refill the
water sump.
The evaporator is warmed, allowing the cubes
to release from the evaporator and drop into
the storage bin. The control system will adjust
the length of the Harvest cycle to conditions
and regulate whether the condenser fan will
run.
At the end of the Harvest cycle, the ice
machine will start another Freeze cycle
(Step 3).
5) Automatic Shut-Off
The level of ice in the storage bin controls the
ice machine shut-off. When the bin is full, ice
will contact the bin thermostat bulb holder.
The bin thermostat bulb cools, which stops the
ice machine.
The ice machine remains off until ice no longer
contacts the bin thermostat bulb holder and
the thermostat bulb warms up. The increase in
temperature will restart the ice machine
(Step 1).
O P E R AT I O N A L C H E C K S
Sub-Zero ice machines are factory-operated
and adjusted before shipment. Normally, new
installations do not require any adjustment.
To ensure proper operation, always follow the
Operational Checks:
when starting the ice machine for the first
time
after a prolonged out of service period
after cleaning and sanitizing
NOTE: Routine adjustments and maintenance
procedures are not covered by the warranty.
W A T E R L E V E L
The ice machine maintains the correct water
level. The water level is not adjustable.
B I N T H E R M O S T A T A D J U S T M E N T
The bin thermostat stops the ice machine
when the bin is full. Turn the thermostat to the
left to decrease the level of ice in bin or to the
right to increase the level of ice in bin.
S U B - Z E R O I C E M A C H I N E O P E R A T I O N