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REFRIGERATION PIPING
Refrigeration components for OWZA cases are easily acces-
sible in the tank and beneath the case.
The expansion valve and suction line 1/4” access valve are
both located on the front-left side of the tank and are acces-
sible without lifting the fan plenum. These components may
be reached by lifting only the left-hand deck pan which mini-
mizes the need to remove product.
The diagram on page 7 illustrates all of the refrigeration
components in the case – the box-shaped dotted line indicates
those components that are located within the case tank.
Basic defi nitions of these components are listed below.
Access Valve
Access port on the evaporator that allows service personnel to
check system pressure.
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 refriger-
ant 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 refrig-
erant.
Condenser Fan
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
pressure.
Split 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 re-
frigerant that is not being used by the system in low load condi-
tions or when the system is shut down.
Service Valve
A manually operated valve in the refrigeration system that is
used for various service operations such as isolating the high or
low sides of the system.
Suction Line Solenoid
A device that prevents liquid from entering the compressor.
Thermostatic Expansion Valve (TXV)
A valve that controls the fl ow of liquid refrigerant to the evapo-
rator coil and also separates the high pressure side of the system
from low pressure side of the system.
Thermostatic Expansion Valve (TXV) Bulb
A bulb that is attached to the suction line of the evaporator that
controls the TXV. Inside the bulb is a charge that reacts to
temperature and regulates the fl ow of refrigerant through the
expansion valve.
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