Hoshizaki KM-260BWH, Service Manual

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starts after the thermistor temperature reaches 36°F (2°C). After this period, the
freeze cycle operation is transferred to the
fl oat switch for freeze termination. During
the fi rst 5 minutes of freeze, con fi rm that the evaporator temperature drops. After the
minimum freeze period, disconnect the fl oat switch at the 2-pin connector attached to
the red wires. The unit should immediately switch to the pump-out 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
fi ll the
reservoir, if there are improper unit pressures or an inoperative compressor. If the
unit remains in freeze with the
fl oat switch removed, replace the board.
Note: Normal freeze cycle will last 20 to 40 minutes depending on model and
conditions. Cycle times and pressures should follow performance data provided
in this manual.
6) Pump-Out 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.
8) Shutdown – See “II. 5. [b] BIN CONTROL CHECK PROCEDURE”. Note that after a
bin-control initiated shutdown, there is a 90 second minimum off time.
Note: Unit continues to cycle until bin control is satis fi ed or power is turned off. (The
pump-out 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
fi ll cycle.