Hoshizaki KM-250BWF - Manual (Page 9)

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2. Controller Board
[a] Solid-State Control
1) A HOSHIZAKI exclusive solid-state control is employed in KM-250BAF and
KM-250BWF Crescent Cubers.
2) A printed circuit board (hereafter called “controller board”) includes a stable and high
quality control system.
3) All models are pretested and factory-adjusted.
[b] Controller Board
CAUTION
1. Fragile, handle very carefully.
2. A controller board contains integrated circuits, which are susceptible to
failure due to static discharge. It is especially important to touch the metal
part of the unit when handling or replacing the board.
3. Do not touch the electronic devices on the board or the back of the board
to prevent damage to the board.
4. Do not change wiring and connections. Especially, never misconnect K3,
K4 and K5, because the same connector is used for the thermistor and
float switch. K4 is not connected.
5. Do not fix the electronic devices or parts on the board in the field. Always
replace the whole board assembly when it goes bad.
6. Do not short out power supply to test for voltage.
PART NUMBER TYPE
2A1410-01 HOS-001A (Control Products)
Features of Control Products “E” Controller Board
1) Maximum Water Supply Period - 6 minutes
Water solenoid valve opening, in the defrost (harvest) cycle, is limited by the defrost
timer. The water valve cannot remain open longer than the maximum period. The water
valve can close in less than six minutes if the defrost cycle is completed.