Technical information

12/01/02
4. Harvest Pump Out
When the float switch opens and signals the completion
of the freeze cycle, the harvest cycle begins. The hot
gas valve opens and the compressor continues to run.
The drain timer starts counting the 10/20 second pump
out.
The water pump stops for 2 seconds and reverses,
taking water from the bottom of the sump and forcing
pressure against the check valve seat allowing water
to go through the check valve and down the drain. At
the same time water flows through the small tube to
power flush the float switch. When the drain timer
stops counting, the pump out is complete.
Pump out always occurs on the 2nd harvest after
startup. The Alpine control board allows for adjustment
for pump out to occur every cycle, or every 2nd, 5th or
10th cycle from this point.
5. Normal Harvest Cycle
The water valve opens to allow water to assist the
harvest. As the evaporator warms, the thermistor
reaches 48° F. The control board receives the
thermistor signal and starts the defrost timer. The
watervalve is open during harvest (defrost) for a
maximum of 6 minutes or the length of harvest,
whichever is shorter. When the defrost timer completes
its count down, the defrost cycle is complete and the
next freeze cycle starts.
The unit continues to cycle through 3 , 4 and 5
sequence until the bin control senses ice and shuts
the unit down.
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12/20/03
2/20/03