Twin Eagles AM-50BAE-AD - Manual (Page 30)

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3. Controls
[a] Icemaking Control
The freeze and defrost cycles are controlled by the combination of a thermistor and an electronic
controller.
When the evaporator cools down to a specific temperature (around +28°F (-2°C)), the
thermistor attached to the evaporator senses the temperature and signals to the electronic
controller. After the built-in timer counts 10 minutes from the signal input, the controller switches
the contact of the built-in relays (X1 and X2) to stop the pump motor and fan motor and to
open the hot gas valve and water valve. This completes the freeze cycle and starts the defrost
cycle.
[b] Defrost Control
The ice cubes formed inside the icemaking cells are released by hot gas warming the
evaporator. When a small portion of the ice melts on the icemaking cell interior, the ice drops
by its own weight and slides down the ice guide into the storage bin. When the evaporator is
warmed further (to around +45°F (+7°C)), the thermistor senses the temperature rise and
signals to the electronic controller. After the built-in timer counts 50 seconds from the signal
input, the controller switches the contact of the built-in relays to start the pump motor and fan
motor and to close the hot gas valve and water valve. This completes the defrost cycle and
starts the freeze cycle.
At low temperature conditions where the defrost cycle exceeds 3 minutes, the water valve will
close after 3 minutes.
In the initial cycle at startup or after shutdown for bin control, water is supplied for 80 seconds.
This means the water valve closes (approx. 30 seconds) after the freeze cycle starts.
[c] No Adjustment Required
The thermistor and electronic controller are factory adjusted to produce constant ice all the
year around, not affected by changes in the ambient and water temperatures.
No adjustment is required for any frequency 50/60Hz or ambient temperature.