Bin Control Switch; [A] Explanation Of Operation; [B] Bin Control Check Procedure - Hoshizaki KM-40B Service Manual

4) Check for resistance between the thermistor leads. Normal reading is within 3.5 to 7
kΩ. Replace the thermistor if it exceeds the normal reading.
5. BIN CONTROL
This machine uses a lever-actuated proximity switch (mechanical bin control) to control
the ice level in the storage bin. No adjustment is required.

[a] EXPLANATION OF OPERATION

The bin control is connected to the K1 connector (pins 4 & 5) on the control board.
When the bin control is calling for ice (proximity switch closed; "POWER OK" LED on),
the control board continues icemaking operations. When the bin control is activated
in the bin full position (proximity switch open; "POWER OK" LED flashing), the control
board drains and shuts down the unit. However, to prevent incomplete batches of ice
from forming on the evaporator, the control board will only shut down the machine
during the freeze cycle before the five minute timer expires. The five minute timer starts
counting down when the thermistor temperature reaches 2°C. If, during the freeze cycle,
ice pushes in the lever after the five minute timer expires, the control board will allow the
machine to complete the freeze cycle and the following harvest cycle before shutting
down the machine.
When the bin control is activated, the "POWER OK" LED flashes. There is a delay
before the shutdown sequence begins. The delay varies depending on the cycle the
icemaker is in at the time of activation. For details, see the table below.
Cycle at Bin Control Activation Delay Before Shutdown Sequence Begins
Fill Cycle
Harvest Cycle
Freeze Cycle

[b] BIN CONTROL CHECK PROCEDURE

1) Clear any ice away from the bin control.
2) Make sure the control switch is in the "ICE" position.
3) Check that the "POWER OK" LED on the control board is on.
4) Activate the bin control actuator (press the actuator in). Check that the "POWER OK"
LED flashes.
15 seconds
15 seconds after the next freeze cycle starts
15 seconds if the bin control is activated between the
beginning of freeze and termination of the 5-minute short
cycle protection timer (timer starts when the thermistor
temperature drops to 2°C (5.5 kΩ or more)). After this time,
the unit will not shut down until the next harvest cycle is
complete.
29