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Test Operation, Troubleshooting and Maintenance
4.4 Replacement of main parts
4.4.1 Brief introduction
Image Name Function
Compressor
It is the power source of
the whole system, used to
compress low-pressure and
low-temperature refrigerant
to be high-pressure and high-
temperature gas.
Vapor-liquid separator
It is intended to separate
refrigeration oil from liquid
refrigerant.
Four-way valve
It is used to control the ow
direction of refrigerant for either
heating or cooling.
Shell-and-tube heat exchanger
It is intended conduct heat
exchange between the
refrigerant and the second
refrigerant.
Finned heat exchanger
At the cooling mode, it is
intended to turn the
high-temperature high-pressure
refrigerant vapor into refrigerant
liquid by releasing heat to
the cooling medium. At the
heating mode, it is intended to
vaporize refrigerant liquid by
absorbing heat from the cooling
medium.
Electric expansion valve
It is intended to control
refrigerant ow rate to make it
match with the required load
and make the refrigerant owing
into the evaporator evaporate
completely.
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