Service Manual

66 Part Number: 000015430 Rev 02 5/20
Sequence of Operation
SELF CONTAINED AIR OR WATER COOLED
NOTE: The On/Off button must be depressed and the
water curtain/ice dampers must be in place on the
evaporator before the ice machine will start.
Initial Start-Up or Start-Up After Automatic Shut-Off
1. Water Purge
Before the compressor starts, the water pump and water
dump solenoid energize to purge the ice machine of old
water. This feature ensures that the ice making cycle starts
with fresh water.
2. Refrigeration System Equalization and Start-Up
The harvest valve(s) and air pump(s) energize to equalize
high and low side refrigeration pressure.
After 5 seconds the contactor energizes the compressor
and supplies power to the condenser fan motor. After 5
seconds the harvest valve(s) and air pump(s) de-energize.
NOTE: The fan motor is wired through a fan cycle pressure
control. When the discharge pressure exceeds the cut in
pressure the fan cycle switch closes and energizes the fan
motor.
Freeze Sequence
3. Prechill
The compressor is on for 30 seconds (120 seconds initial
cycle) to lower the temperature of the evaporator(s)
before the water pump is energized. The water fill valve
will energize and remain on until water touches the low
and high, water level probes for 5 seconds.