Hoshizaki KM-151BAH - Manual (Page 17)

12
[b] FEATURES
a) Maximum Water Supply Period - 6 minutes
The inlet water valve will be open during harvest for 6 minutes or the length of harvest
minus 0, 10, 30, or 50 seconds (adjustable by S1 dip switch 7 & 8), whichever is shorter.
b) Harvest Backup Timer and Freeze Timer
The harvest backup timer shuts down the icemaker if, for two cycles in a row, the
harvest cycle takes more than 20 minutes to complete. The control board will signal this
problem using 2 beeps every 3 seconds.
The freeze timer shuts down the icemaker if, for two cycles in a row, the freeze cycle
takes longer than the time specified to complete. The control board will signal this
problem using 3 beeps every 3 seconds. The time is factory set using S1 dip switch 9 &
10.
The alarm reset button on the control board must be pressed with power on to reset
either of these safeties.
c) High Temperature Safety
The temperature of the suction line in the refrigeration circuit is limited by the high
temperature safety. This protects the unit from excessively high temperatures. If the
evaporator temperature rises above 127°F ± 7°F (53°C ± 4°C), the thermistor operates
the safety. This shuts down the circuit and the icemaker automatically stops.
The control board will signal this problem using 1 beep every 3 seconds. The alarm
reset button on the control board must be pressed with power on to reset the safety.
d) Low Water Safety
The control board checks the position of the float switch at the end of the initial one
minute water fill cycle and at the end of each harvest cycle.
If the float switch is in the up position (electrical circuit closed), the control board
changes to the next cycle. If the float switch is in the down position (electrical circuit
open), the control board changes to additional one minute water fill cycles until water
enters the sump and the float switch closes. When the float switch closes, the control
board changes to the next cycle. The unit will not start without adequate water in the
sump. This serves as a low water safety to protect the water pump.
For water-cooled model, if the condenser water supply is shut off, the unit is protected
by the high-pressure switch.
e) High Voltage and Low Voltage Cut-outs
The maximum and minimum allowable supply voltages of this icemaker are limited by
the high voltage and low voltage cut-outs.
If miswiring (especially on single phase 3 wire models) causes excessive voltage (147Vac
± 5% or more) on the control board, the high voltage cut-out shuts down the circuit