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c) High Temperature Safety — 53 ± 4°C
The temperature of the suction line in the refrigerant circuit is limited by the high
temperature safety. During the defrost cycle the evaporator temperature rises. The
thermistor senses 9°C and starts the defrost timer. After the defrost timer counts down to
zero, the normal freeze cycle begins. If the evaporator temperature continues to rise, the
thermistor will sense the rise in temperature and at 53 ±4°C the thermistor operates the
high temperature safety. This high temperature safety shuts down the circuit and the
icemaker automatically stops. To reset the safety, turn the power off and back on again.
This high temperature safety protects the unit from excessive temperature. The control
board will beep every 3 seconds. The white reset button on the control board must be
pressed with power on to reset the safety.
d) Low Water Safety
If the pump motor is operated without water, the mechanical seal can fail. To prevent this
type of failure, the controller 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 defrost cycle.
If the float switch is in the up position (electrical circuit closed), the controller board
changes to the ice making cycle. If the float switch is in the down position (electrical
circuit open), the controller board changes to a one minute water fill cycle before starting
the ice making cycle. This method allows for a low water safety shut down to protect the
water pump from mechanical seal failure.
e) High Voltage Cut-out — control voltage > 147Vac ±5%
The maximum allowable supply voltage of this icemaker is limited by the high voltage
cut-out. If miswiring causes excessive voltage on the controller board, the high voltage
cut-out shuts down the circuit in 3 seconds and the icemaker automatically stops. When
the proper supply voltage is resumed, the icemaker automatically starts running again.
The control board will signal this problem using 7 beeps every 3 seconds.
f) LED Lights and Audible Alarm Safeties
The red LED indicates proper control voltage and will remain on unless a control voltage
problem occurs. At startup a 5 second delay occurs while the board conducts an internal
timer check. A short beep occurs when the power switch is turned ON or OFF.
