Shutdown - Hoshizaki IM-500SAA Service Manual

ET temperature is recorded 30 seconds after PM energizes. Water temperature
correction value (CB Setting 13) is added to ET temperature and this is used as WT
value in following harvest cycle.
If CBT>81°F (27°C) (CB Setting 74) and CBT≤111°F (44°C) (CB Setting 70), when
ET≤-1.3°F (-18.5°C) (CB Setting 2), HGV energizes 5 sec., de-energizes 25 sec.,
energizes 5 sec. (CB Settings 71 and 72) to reduce bonding of the water tank to the
evaporator.
CB monitors time after ET temperature≤32°F (0°C). CB terminates freeze cycle when the
following equation is satisfied:
temp. (absolute value) × time (min.) = (absolute value of CB Setting 2) × (CB Setting 3)
Using default settings, freeze cycle is terminated when:
temp. (absolute value) × time (min.) = 185
This formula helps maintain consistent dimple size regardless of differences in seasonal
ambient and water temperatures.

4. Shutdown

When BC is engaged (open) for more than 10 seconds, the icemaker shuts down after
harvest cycle.
When BC is disengaged (closed) for more than 80 seconds, icemaker restarts at startup
cycle.
If BC is engaged (open) while the water tank is opening after the power supply is turned
on (or after the "RESET" button is pressed), shutdown does not start: Shutdown occurs
10 seconds after actuator motor's internal position sensor indicates water tank is fully
open.
Legend: AMD–actuator motor down; AMU–actuator motor up; BC–bin control; CB–control
board; CBT–control board thermistor; Comp–compressor; ET–evaporator
thermistor; FD–full drain (CB Setting 14); FM–fan motor; HGV–hot gas valve;
PM–pump motor; PD–partial drain (CB Setting 14); PS–position sensor; WT–water
temperature; WV–inlet water valve
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