Hoshizaki IM-500SAB Service Manual page 13

Freeze Termination: 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.
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 the 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.
4) Harvest Cycle: Same as the initial harvest cycle. Return to step 2) above.
Note: Appliance continues to cycle until BC is satisfied or power is switched off.
The appliance always restarts at the startup cycle.
2. Shutdown Diagnosis
1) 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. See "II.E.1. Bin Control Check."
Legend: AMD–actuator motor down; AMPS–actuator motor position sensor;
AMU–actuator motor up; BC–bin control; CB–control board; CBT–control board
thermistor; Comp–compressor; CS–control switch; ET–evaporator thermistor;
FM–fan motor; HGV–hot gas valve; HPS–high-pressure switch; PM–pump motor;
WT– water temperature; WV–inlet water valve
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