Hoshizaki KM-2400SRH3 User Manual download pdf (Page 10)

2) Defrost Timer

The defrost cycle starts when the Float Switch opens and completes the freeze cycle.

But the Defrost Timer does not start counting until the Thermistor senses 48°F at the

Evaporator outlet. The period from the end of the freeze cycle up to the point of the

Thermistor's sensing varies depending on the ambient and water temperatures.

3) High Temperature Safety - 127 ± 7°F

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

48°F 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 127 ± 7°F 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.

4) 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.

5) High Voltage Cut-out

The maximum allowable supply voltage of this icemaker is limited by the High Voltage

Cut-out.

If miswiring (especially on single phase 3 wire models) 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.

6) 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.

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Hoshizaki KM-2400SRH3 User Manual Page 10