Features; A) Maximum Water Supply Period - 6 Minutes; B) Harvest Backup Timer And Freeze Timer; C) High Temperature Safety - Hoshizaki KM-600MAH Service Manual

2. 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
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 S4 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 ± 7°F (53 ± 4°C), the control board reads a
.804 kΩ signal from the thermistor and 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 1 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 ice making cycle. If the float switch is in the down position (electrical
circuit open), the control board changes to additional 1 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 ice making cycle. The unit will not start without adequate water in
the sump. This serves as a low water safety to protect the pump motor from mechanical
seal failure.

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 in 3 seconds and the icemaker automatically stops. The control board will signal
this problem using 7 beeps every 3 seconds.
The icemaker also automatically stops in cases of insufficient voltage (92Vac ±5% or
less). The control board will signal this problem using 6 beeps every 3 seconds.
When the proper supply voltage is resumed, the icemaker automatically starts running
again.
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