Filter
Top Products
GEM0650/0956/1256 Remote Operation: Refrigeration
Page 21
Beginning at the compressor, the refrigerant is compressed into a high temperature gas. The discharge line
directs this gas to the condenser and to the head pressure control. At the remote condenser the gas is
cooled by air and it then condenses into a liquid. This high pressure liquid then goes through the liquid line
connection at the head pressure control. If the head pressure is high enough the liquid refrigerant will go
through the valve and enter the receiver. From the receiver, the liquid refrigerant flows through the liquid line
valve and then to the expansion valve.
The thermostatic expansion valve meters liquid refrigerant into the evaporator, the volume of liquid
refrigerant depending upon the temperature of the evaporator; warmer evaporators get more refrigerant and
colder evaporators get less. At the evaporator, the refrigerant enters an area of relatively low pressure, where
it can easily “boil off” or evaporate. As it evaporates, it absorbs heat from the evaporator and whatever is in
contact with it (such as the water inside it). After the evaporator, the refrigerant, now a low pressure vapor,
goes through the suction line back to the compressor, where the cycle is repeated.
Refrigeration Schematic
Remote Condenser
Discharge
Line
Liquid Line
Detail of Head Pressure Control Valve
Li
q
uid Line Valve
Head Pressure
Control Valve
Compressor
Evaporator
Suction Line
Thermostatic Expansion Valve
Receiver