Service Manual

68 Part Number: 000015430 Rev 02 5/20
Ice Thickness Probe
The freeze cycle continues until the six minute freeze lock
expires and enough ice has formed to send a signal from
the ice thickness probe to the control board.
During the first 6 minutes of the freeze cycle the ice
thickness probe microphone samples ambient noise.
6 minutes into the freeze cycle baseline readings are
recorded. Ice formation on the evaporator will change
the readings; when the baseline readings are exceeded a
harvest cycle starts.
Harvest Sequence
5. Water Purge
The air pump(s) (when used) and the harvest valve(s) open
at the beginning of the water purge to divert discharge
refrigerant gas into the evaporator.
The water pump(s) continues to run, and the water dump
valve energizes to purge any remain water in the water
trough down the drain.