User's Manual

16
2. Controller Board
[a] Solid-State Control
1) A HOSHIZAKI exclusive solid-state control is employed in KM-1300SAH, KM-1300SWH,
KM-1300SRH, KM-1300SAH3, KM-1300SWH3, and KM-1300SRH3 Stackable 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. Do not misconnect K3, K4 and K5, because
the same connector is used for the thermistor and float switch. K4 is not connected.
5. 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 - 10 Pin)
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.
(2) Defrost Timer
The defrost cycle starts when the float switch opens and completes the freeze cycle. But the
defrost timer does not start counting until the thermistor senses 48°F at the evaporator outlet.
The period from the end of the freeze cycle up to the point of the thermistor's sensing varies
depending on the ambient and water temperatures.