Hoshizaki TM-500AAE, Service Manual

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17
6. ELECTRIC CIRCUIT
CAUTION
Reassemble all the components as they were after servicing the unit according to
a service call.
[a] BASIC OPERATION
The icemaker starts water supply when the Operation Switch is turned ON and the Ice Button is
pressed (floor mounting) or in 30 seconds after the Bin Control Switch checks that the Storage
Bin is not filled with ice (fixed mounting). On completion of water supply, the Fan Motor starts
and the Line Valve opens. After 120 seconds the Compressor starts, and then after 15 seconds
the Gear Motor starts to begin icemaking operation.
When the Stop Button is pressed or the Bin Control Switch trips (fixed mounting only), the icemaker
stops icemaking operation, starts pumping down to drain water from the Tank, and finally shuts
down.
For fixed mounting only, the icemaker automatically starts the pump down cycle to drain water
every 12 hours after the Compressor starts. The icemaker starts water supply and resumes
icemaking operation in 8 minutes after the drain cycle completes.
The icemaker is equipped with fan speed control. It monitors the condenser center temperature
and slows down the fan rotation to regulate the condensing pressure. This function is to prevent
a mechanical trouble with overproduction of ice.
The Heater (Tank) and Heater (Cutter) are energized or de-energized depending on the water
supply temperature and continuously energized when the Thermistor reads a temperature below
5°C.