IM-0770
Sequence Of Operation
8
IM-0770-AN/AF Sequence of Operation
Start-Up Sequence
Power switch set to the “ICE” position:
•Gear motor, inlet water valve, and bypass valve is energized simultaneously.
•Bypass valve stays energized for 50 seconds.
•Bypass valve is de-energizes for 10 seconds.
•Compressor energizes and freeze cycle begins.
•Once the head pressure reaches 235 psig, the fan cycle switch closes and the fan motor energizes.
Shut-Down Sequence
Power switch set to the “OFF” position while in freeze:
•Compressor is de-energizes immediately.
•Head pressure drops to 175 psig & the fan cycle switch opens, de-energizing the fan motor.
•Gear motor de-energizes 1 minutes after the power switch is put in the “OFF” position.
Note: Sump remains full of water. Dump valve does not energize and drain, so the
sump remains full of water when the machine is off.
Shut-Down Sequence Via Bin Switch
Same as the previous shut-down sequence:
•When the bin-switch is made or broken, the machine starts or stops with nearly no delay (2 seconds max).
Purge Cycle (set for every 12 hours)
Total Cycle Time = 20 minutes:
•Compressor is de-energized. Dump valve energizes (emptying sump) and the gear motor remains energized.
•Approximately 5 minutes in, the gear motor is de-energized & the inlet water valve is energized, refilling the
sump and flooding the evaporator with water.
•19 minutes in, the dump valve is energized (draining all water).
•19.5 minutes in, the inlet water valve & gear motor is energized.
•20 minutes in, the compressor is energized.
•When head pressure reaches 230 psig, the fan motor is energized
Note: The machine drains & refills 2 times, not continuously.
