Ice-O-Matic VRC - Manual (Page 10)

Remote Condenser Remote Refrigeration System
Page 4
The Remote Refrigeration System is shown in the above diagram. During the freezing cycle, high
temperature and high pressure liquid refrigerant is directed from the condenser through a mixing valve,
receiver, liquid line solenoid heat exchanger and a filter drier. The expansion valve meters refrigerant to the
coils on the back of the evaporator.
In low ambient conditions (below 70
°F air temperature at the condenser) the mixing valve opens to mix
discharge gas with liquid returning from the condenser, in the receiver, to maintain discharge and liquid line
pressures.
The low temperature and pressure refrigerant leaving the evaporator is directed through the suction line
heat exchanger and is returned to the compressor. There it is compressed to a high temperature and high
pressure gas. It is then directed to a condenser to be converted again to a high pressure and high
pressure liquid.
During the harvest cycle, the hot gas solenoid valve (normally closed during the freeze cycle), opens and
directs the high temperature gas leaving the compressor into the evaporator. Once the evaporator has
reached approximately 40
°F, the harvest motor overcomes the capillary attraction of the ice and the
evaporator releases the ice. At the end of the harvest cycle, the hot gas solenoid valve closes and another
freeze cycle begins.
During the off cycle, the liquid line solenoid valve closes and the system will pump down to 10-20 psi to
prevent refrigerant migration to the low side of the system.