Technicians Only: Freeze Cycle Sequence of Operation
This sequence begins with a restart after the unit
has shut off with the bin full. Ice has been
consumed, causing the ice sensors to become
un-blocked.
1. The controller switches off the bin full light (four
minutes has to have passed since the machine
shut off on bin full for the machine to restart) and
switches on the Freeze light.
2. The purge valve is opened and the pump
started.
3. After the purge valve closes the inlet water valve
opens and fills the reservoir.
Note: If the water reservoir does not fill within the
time period expected the controller will shut off and
blink the water diagnostic light. It will re-try to fill
the reservoir in 20 minutes. If successful the freeze
cycle will continue.
4. The compressor and
fan motor start and the
freezing process begins.
5. The controller
measures the reservoir
water temperature and
compares it to the
temperature it expects to
find at that point in the
cycle. If normal, nothing
happens.
If high, the controller
checks the discharge
temperature. If that is
normal, nothing happens.
If that is low, the controller
starts a diagnostic
process that could lead to
the unit shutting off, as
the refrigeration system
may not be operable.
6. Assuming that the system is working normally,
the controller will shut the water pump off for a few
seconds when the reservoir’s water temperature
reaches a pre-set point.
7. As the machine makes ice the water level in the
reservoir falls. When it reaches the point where the
float stem blocks the upper infrared beam in the
water level sensor the controller opens the inlet
water valve to refill the reservoir. The water valve
stays on until the float stem rises to block the lower
beam in the water level sensor.
8. The freezing process continues until the float
stem blocks the upper beam for the second time.
That signals to the controller that the freezing
process is complete.
Eclipse
ä
1300, 1600
September 2003
Page 32
Water Schematic
Water Pump
Purge Valve
Inlet Water
Valve
