Filter
Top Products
INTRODUCTION
94
Design
■
Features
■
Performance
SEQUENCE OF OPERATION
On initial start-up or restart, closing of bin thermostat, the toggle switch is in the ICE position:
1. The water solenoid valve and hot gas solenoid valve are opened (energized) for 180 seconds
(three minutes). This ensures the icemaking cycle starts with fresh water, and the refrigerant pressures
are equalized prior to compressor start-up.
2. The compressor starts 175 seconds after the hot gas solenoid valve and water solenoid valves are
opened.
3. The water pump and condenser fan motor are energized. The hot gas solenoid valve and water
solenoid valves are de-energized (closed) five seconds after the compressor starts. The unit is now
in the freeze cycle.
4. As the water pump circulates the water, an even flow is directed across the evaporator and into each
cube cell, where it freezes. As the water freezes, gravity causes any sediment to drop into the water
trough and not becoming imbedded in the ice. This gives a clearer cube with low mineral content.
5. The control system automatically determines the length of the freeze cycle by monitoring the temp-
erature of the refrigeration system “high side” using a thermistor.
6. One minute prior to finishing the determined freeze cycle, the control determines the length of the
harvest cycle by again monitoring the temperature at the thermistor.
7. When the freeze cycle is completed, the control de-energizes the water pump and the condenser fan
motor. The compressor remains running during the harvest cycle. The control then energizes the hot
gas solenoid valve and water solenoid valve for the duration of the harvest cycle. The hot refrigerant
gas warms the evaporator causing the cubes to slide, as a sheet, off the evaporator and into the storage
bin. At the same time, the water trough is being purged with fresh water.
8. At the conclusion of the harvest cycle, the machine returns to a new freeze cycle. The compressor
continues to run. The water pump and condenser fan motor are energized. The hot gas solenoid valve
and water solenoid valves are de-energized (closed).
Automatic Shut-off
The ice machine shut-off is controlled by the level of ice in the ice storage bin. When the bin is full, ice
contacts the bin thermostat bulb holder, which senses the cool temperatures, then opens which stops the
ice machine.
The ice machine will remain off until the ice cubes no longer contact the bin
thermostat bulb holder. This causes the bin thermostat to warm and close, restarting the ice machine.
When the ice machine restarts, it returns to the start-up sequence (steps 1, 2, and 3 above).