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COMPONENT DEFINITIONS
Access Valve - Access port on the evaporator that allows service personnel to check system pres-
sure.
Accumulator - A device installed on the suction line that is used to boil off small amounts of liquid
refrigerant so liquid does not reach the compressor.
Compressor
- An electrically driven piston pump that pumps vapor refrigerant from a low pressure
level to a higher pressure level.
Condenser - The component in a refrigeration system that transfers the heat that was absorbed by
the refrigerant in the evaporator and the heat of compression from the system by condensing the
refrigerant.
Condenser Fans
- Fan that forces air through the air cooled condenser to aid heat transfer.
Dual Pressure Control
- A device that protects the compressor from low charge and high pres-
sure.
Evaporator - The component of the refrigeration system that absorbs heat from the air by boiling
liquid refrigerant to vapor.
Evaporator Fans - Fans that circulate air through the case and force air through the evaporator to
aid heat transfer.
Filter Drier
- A device installed on the liquid line of a refrigeration system that removes water and
other impurities from the refrigerant in the lines during initial start-up.
Receiver - The component in a refrigeration system that stores liquid refrigerant that is not being
used by the system in low load conditions or when the system is shut down.
Service V
alve - A manually operated valve in the refrigeration system that is used for various ser-
vice operations such as isolating the high or low sides of the system.
Sight Glass - A device installed on the liquid line of a refrigeration system that is used to determine
if there is water or vapor in the lines by visual inspection.
Suction LIne Solenoid - A device that prevents liquid from entering the compressor.
Thermostatic Expansion V
alve (TXV) - A valve that controls the flow of liquid refrigerant to the
evaporator coil and also separates the high pressure side of the system from low pressure side of
the system.
Thermostatic Expansion V
alve (TXV) Bulb - A bulb that is attached to the suction line of the evap-
orator that controls the TXV. Inside the bulb is a charge that reacts to temperature and regulates
the flow of refrigerant through the expansion valve.