Hoshizaki KML-351MAH Service Manual page 32

5) Freeze Cycle – LED 1 is on. Compressor (and fan motor on a remote air-cooled
unit) remains energized, pump motor, liquid line valve (if applicable), and fan motor
(self-contained air-cooled unit) energize. The inlet water valve and hot gas valve
de-energize. The unit is held in freeze by a 5 minute short cycle protection timer. After
the 5 minute short cycle protection timer terminates, 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 5 minutes in freeze, remove the
black float switch lead from the K5 connector. The unit should switch out of the freeze
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 inlet water valve is
continuing to fill the reservoir, if there are improper unit pressures, an inoperative
compressor, or an inoperative headmaster (C.P.R.) (remote air-cooled unit only). If the
unit remains in freeze with the float switch removed, replace the control 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 (10/20 second pump out) – LEDs 1, 4, 3, 2 are on. The 1st pump
out occurs after the 1st freeze cycle and every 10th cycle thereafter. The pump-out
cycle (dip switch 5 & 6) can be adjusted to occur every cycle, or every 2, 5, or 10
cycles.
The compressor remains energized, the hot gas valve energizes, the fan motor
de-energizes, the pump motor stops for 2 seconds. The service relay energizes,
restarting the pump motor and taking water from the sump and forcing it to go through
the drain valve and down the drain for 10/20 seconds. This removes contaminants from
the water reservoir. Diagnosis: If the pump motor does not run, check the circuit and
service relay. Check for proper voltage. If water does not pump 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 switched off. The
unit always restarts at the 1 minute fill cycle.
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