Hoshizaki KM-100A Service Manual page 30

starts after the thermistor temperature reaches 2°C. After this period, the freeze
cycle operation is transferred to the float switch for freeze termination. During the
first 5 minutes of freeze, confirm that the evaporator temperature drops. After the
minimum freeze period, disconnect the float switch at the 2-pin connector attached
to the red wires. The unit should immediately switch to the drain cycle. Diagnosis:
If the evaporator is not cold, check to see if the hot gas valve is still open or if the
expansion valve is not opening properly, if the water valve is continuing to fill the
reservoir, if there are improper unit pressures or an inoperative compressor. If the
unit remains in freeze with the float switch removed, replace the board.
Note: Normal freeze cycle will last 0 to 40 minutes depending on model and conditions.
Cycle times and pressures should follow performance data provided in this
manual.
6) Drain Cycle – The compressor remains energized, the hot gas valve energizes, the
fan motor de-energizes. The drain valve and pump motor energize, allowing water
to drain from the tank for 10 seconds. This removes contaminants from the water
tank. Diagnosis: If the drain valve does not open, check the circuit. Check for proper
voltage. If water does not drain out, check and clean the tubing at the drain valve and
then check and clean the valve assembly.
7) Normal Harvest Cycle – same as the initial harvest cycle – Return to step 4.
Note: Unit continues to cycle until bin control is satisfied or power is turned off. (The
drain cycle can be adjusted to occur every cycle, or every 2, 5, or 10 cycles. The
factory default is every 10 cycles.) The unit always restarts at the 1 minute fill
cycle.
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