30
Temperature (°F)
Temperature (°C)
Resistance (k
Ω
)
0
-18
14.401
10
-12
10.613
32
0
6.000
50
10
3.871
70
21
2.474
90
32
1.633
Check a thermistor for resistance by using the following procedure:
1) Disconnect the connector CN6 on the board.
2) Remove the thermistor. See “V. 13. THERMISTOR”.
3) Immerse the thermistor sensor portion in a glass containing ice and water for 2 or 3
minutes.
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 CN5 connector (pins 1 & 6) on the control board.
When the bin control is calling for ice (proximity switch closed), the control board
continues icemaking operations. When the bin control is activated in the bin full position
(proximity switch open), the control board performs the bin control (“II. 2. [b] BIN
CONTROL”) 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
minimum freeze cycle timer (5 minutes)
expires. The
minimum freeze cycle timer
starts
counting down when the thermistor temperature reaches 2°C. If, during the freeze cycle,
ice pushes in the lever after the
minimum freeze cycle timer
expires, the control board
will allow the machine to complete the freeze cycle and the following harvest cycle
before shutting down the machine.
If the bin control is calling for ice (proximity switch closed) for more than 90 seconds, the
fill cycle starts.
[b] BIN CONTROL CHECK PROCEDURE
1) The display shows “FUL” and
every component
de-energizes
.
