Motak PKM0335, Installation And User Manual

Page: 23 / 137

Part Number: 000016426 Rev 00 08/2020 23
Ice Making Sequence of Operation - PKM0335/PKM0425/PKM0535
The toggle switch must be in the ICE position and the water curtain must be closed before
the ice machine will start.
1. Water Purge Cycle
The ice machine purges any remaining water from the water trough down the drain and
the refrigeration compressor starts.
2. Freeze Cycle
Prechill - The refrigeration system chills the evaporator before water flow over the
evaporator starts. The water inlet valve energizes during the pre-chill and remains on until
the Ice Thickness Float Switch is satisfied.
Freeze - Water flowing across the evaporator freezes and builds ice on the evaporator.
After a sheet of ice has formed, the Harvest Float Switch signals the control board to start
a harvest cycle.
3. Harvest Cycle
Any remaining water is purged down the drain as refrigerant gas warms the evaporator.
When the evaporator warms, the sheet of cubes slides off the evaporator and into the
storage bin. If all cubes fall clear of the water curtain, the ice machine starts another freeze
cycle.
4. Full Bin Cycle
If the water curtain is held open by ice cubes, the ice machine shuts off and starts a
3-minute delay period. When the water curtain closes, the ice machine starts a new cycle
at the water purge, provided the 3-minute delay period has expired.
CONTROL BOARD TIMERS
The control board has the following non-adjustable timers:
• The ice machine is locked into the freeze cycle for 6 minutes before a harvest cycle can
be initiated.
• The maximum freeze time is 60 minutes, at which time the control board automatically
initiates a harvest sequence.
• The maximum harvest time is 3.5 minutes. The control board automatically initiates a
freeze sequence when this time is exceeded.
Section 2
Ice Machine Operation