Service manual

Service and Parts Manual

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 (3 minutes). This ensures that the icemaking cycle starts with fresh water,

and that the refrigerant pressures are equalized prior to compressor start-up.

2. The compressor starts 175 seconds after the hot gas solenoid valve and water sole-

noid valves are opened.

3. The water pump and condenser fan motor are energized, and the hot gas solenoid

valve and water solenoid valves are de-energized (closed) five seconds after the com-

pressor starts. The unit is now in the freeze cycle.

4. As the water pump circulates the water, an even flow is directed across the evapora-

tor 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 moni-

toring the temperature 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 tempera-

tures, then opens which stops the ice machine. The ice machine remains off until

enough ice has been removed from the bin or has melted that the ice cubes are

no longer in contact with 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).

U-LINE CLR60 SEQUENCE OF OPERATION