Hoshizaki KM-260BWH, KM-260BAH, KM-201BAH Overfreeze Detection Control S2 dip switch 5 Program Ver

m) Overfreeze Detection Control (S2 dip switch 5) [Program Ver. 3.2]

Do not adjust. This must be left in the factory default position or the unit will not operate properly.

It is deactivated on the KM-201BAH/BWH and KM-260BAH/BWH.

When activated, the thermistor detects the temperature of the evaporator outlet to find overfreeze in a harvest cycle and at the beginning of a freeze cycle. If the difference between the maximum temperature after the water saver timer starts counting and the temperature at the end of a harvest cycle is 4K or more and if the temperature at the end of a harvest cycle is 48°F (9°C) or less, the harvest cycle is extended for 30 seconds. If the difference between the temperature at the beginning of a freeze cycle and the minimum temperature after 30 seconds in the freeze cycle is 2.5K or more and less than 3.5K, the next harvest cycle is extended for 30 seconds. If the above conditions occur in succession, the number of occurrence times 30 seconds will be added to the harvest cycle time. If the above temperature difference is 3.5K or more, the freeze cycle ends after the minimum freeze cycle time and a harvest cycle starts.

S2 Dip Switch Setting	Overfreeze Detection
No. 5	Control
OFF	Deactivated
ON	Activated

n) Anti-Slush Control (S2 dip switch 6) [Program Ver. 3.2]

Do not adjust. This must be left in the factory default position or the unit will not operate properly.

When activated (Ver. 1.1), the thermistor located on the suction line checks for a 41°F (5°C) temperature as the evaporator cools. When 41°F (5°C) is reached, a 4.8 kΩ signal causes the control board to de-energize the pump motor for 10 seconds.

When activated (Ver. 2.0), the thermistor located on the suction line checks for a 50°F (10°C) temperature as the evaporator cools. When 50°F (10°C) is reached, a 3.9 kΩ signal causes the control board to de-energize the pump motor for 10 seconds and energize it for 50 seconds repeatedly. When 34°F (1°C) is reached, a 5.9 kΩ signal causes the control board to de-energize the pump motor for 10 seconds, energize it for 50 seconds, de-energize it again for 10 seconds, then energize it continuously.

S2 Dip Switch Setting	Anti-Slush Control
No. 6
OFF	Activated (Ver. 1.1)
ON	Activated (Ver. 2.0)

[d] CONTROL BOARD CHECK PROCEDURE

Before replacing a control board that does not show a visible defect and that you suspect is bad, always conduct the following check procedure. This procedure will help you verify your diagnosis.

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