Hoshizaki KM-901MWH, KM-901MAH, KM-901MRH/3 Bin Control, Float Switch, Thermistor, Control Switch

D. Bin Control

1. Thermostatic Bin Control: Auxiliary Code T-0, U-0

CAUTION

When the ambient temperature is below 45°F (7°C), the thermostatic bin control switch opens and shuts down the icemaker even if the ice storage bin is empty. When the thermostat is set in the prohibited range, the icemaker operates continuously even if the ice storage bin is filled with ice. Setting in the prohibited range may result in severe damage to the icemaker.

The thermostatic bin control switch is a temperature controlled switch used to control the level of ice in the bin. It is in line with the power supply to the control switch.

The thermostatic bin control switch shuts down the unit within 10 seconds when ice contacts the thermostatic bulb, regardless of the cycle at activation. The thermostatic bin control is factory set, and generally no adjustment is required. However, adjustment may be needed in some conditions, particularly at higher altitude locations. For further details, see "IV.C.1. Thermostatic Bin Control Check."

2. Mechanical Bin Control: Auxiliary Code U-1 and Later

The mechanical bin control is a lever-actuated bin control switch used to control the level of ice in the bin. The mechanical bin control connects to the control board RED K4 connector. When the actuator paddle is not engaged (mechanical bin control switch closed; control board green "BC CLOSED" LED on), the unit produces ice. When the actuator paddle is engaged (mechanical bin control switch open; control board yellow "BC OPEN" LED on), the unit shuts down as outlined in the table below.

Cycle at	Shutdown
Mechanical Bin
Control Activation
Fill Cycle	15 seconds after activation.
Harvest Cycle	At the end of the harvest cycle, or up to 15 seconds into the freeze cycle if
	activated at the end of the harvest cycle.
Freeze Cycle	15 seconds after activation if activated at least 15 seconds before the 5-minute
	short cycle protection timer expires. Otherwise, at the end of the next harvest
	cycle.

E. Float Switch

The float switch is used to determine that there is sufficient water in the tank after the 1‑minute fill cycle and after each harvest cycle. The float switch is also used to determine that the appropriate volume of water has been converted into ice before switching out of the freeze cycle. No adjustment is required.

F. Thermistor

The thermistor is used as a harvest control sensor. The thermistor's resistance varies depending on the suction line temperature. The control board monitors the resistance to start the harvest timer. No adjustment is required.

G. Control Switch

The control switch has three positions: "OFF" for power off, "ICE" for icemaking, and "WASH" to activate the water pump when cleaning and sanitizing.

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