Hoshizaki KM-260BAH - Manual (Page 26)

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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 fi nd
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
Control No. 5
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.