[E] Normal Harvest Cycle - Hoshizaki KMD-410MWH Service Manual

[e] NORMAL HARVEST CYCLE

LEDs 5, 6, and 8 are on. Comp continues to run, HGV remains open and HWV opens. As
the evaporator warms, the thermistor reaches 9ºC. The control board then receives the
thermistor's 3.9k signal and starts the harvest timer. HWV is open during harvest for a
maximum of 6 minutes or the length harvest minus 0, 10, 30, or 50 seconds (adjustable by
S1 dip switch 7 & 8), whichever is shorter. LED 8 goes off when HWV closes. PM energizes
and runs for the last 0, 10, 30, or 50 seconds of harvest depending on S1 dip switch 7 & 8
setting. LED 7 comes on when PM energizes. At the end of harvest, the control board
checks for the position of LF/S and proceeds to the freeze cycle if it is closed or calls for a
1-minute fill if it is open.
The unit continues to cycle through [c], [d], and [e] sequence until the bin control is activated
and shuts the unit down. When the bin control is activated, the "POWER OK" LED flashes.
Note: To prevent incomplete batches of ice from foaming on the evaporator, the control
board will only shut down the machine within the first 5 minutes of the freeze cycle
after the thermistor temperature reaches 2°C. If ice pushes the bin control actuator in
(open) after this minimum freeze period, the control board will allow the machine to
complete the freeze cycle and the following harvest cycle before shutting down the
machine.
Legend: Comp–compressor; DV–drain valve; FMS–self-contained fan motor; FWV–fill
water valve; HGV–hot gas valve; HWV–harvest water valve; LF/S–lower float
switch contacts; UF/S–upper float switch contacts; PM–pump motor
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