Hoshizaki KM-151BAH User Manual

Page 35

starts after the thermistor temperature reaches 36°F (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. See Fig. 2 for general location. 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 (on KM-151BAH only) 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 energizes, allowing water to drain from the
tank for 20 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.