Part Number 000001590 Rev03 11/19 19
Sequence of Operation
Depending on ambient conditions and cold water supply
temperature, the ice making process will take approximately
30 minutes.
Step 1 Initial Start-Up or
Start-Up After Automatic Shut- Off — Water Fill
Before the compressor starts, the water inlet valve will
energize to purge old water from the system for about 3
minutes.
Step 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.
Step 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.
Step 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
Step 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
SAFETY TIMERS
The control board has the following non-adjustable safety
timers:
• Initial cycle is 5 minutes longer than subsequent cycles.
• The ice machine is locked into the freeze cycle for 10
minutes (15 minutes initial cycle) before a harvest cycle
can be initiated.
• The maximum freeze time is 120 minutes at which time
the control board automatically initiates a harvest cycle
(step 4).
• The maximum harvest time is 5 minutes at which time
the control board automatically starts a freeze cycle.
Operational Checks
Manitowoc 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.
WATER LEVEL
The ice machine maintains the correct water level. The water
level is not adjustable.
BIN THERMOSTAT ADJUSTMENT
The bin thermostat stops the ice machine when the bin is
full. Turn the thermostat counterclockwise to decrease the
level of ice in bin or clockwise to increase the level of ice in
bin.
