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Section 3 Ice Machine Operation
3-3
QM45 SELF-CONTAINED AIR COOLED MODELS
ICE MAKING SEQUENCE OF OPERATION
CONTROL BOARD RELAYS RELAY
1 2 3 3A 3B * LENGTH
WATER PUMP
HOT GAS
VALVE
RELAY COIL
COMPRESSOR
CONDENSER
FAN MOTOR
of “ON” TIME
INITIAL
START-UP/or
START UP
AFTER
AUTO SHUT-
OFF:
1. Pressure
Equalization
OFF
ON
OFF
OFF
OFF
15
Seconds
2. Refrigeration
System Start-up
OFF
ON
ON
ON
ON
5
Seconds
FREEZE
SEQUENCE:
3. Pre-Chill
OFF
OFF
ON
ON
ON
30
Seconds
4. Freeze
ON
OFF
ON
ON
ON
Until 7 sec.
water contact
with ice
thickness
probe
HARVEST
SEQUENCE:
5. Harvest
OFF
ON
ON
ON
ON
Bin switch
activation
6. AUTO SHUT-
OFF
OFF
OFF
OFF
OFF
OFF
Until
bin switch
re-closes
Condenser Fan Motor: The fan motor is wired through a fan cycle pressure control, therefore, it may cycle on and off.