13
Test Operation & Troubleshooting & Maintenance
Vapor Liquid
Separator
It is installed at the side of the suction line, and used
to prevent liquid refrigerant entering the compressor,
which if not avoided will lead to wet compression or
even liquid slugging.
4-way Valve
It is used the switch ow direction of refrigerant
and then realize switchover between cooling and
heating. It also can be used for defrosting through the
counterow.
Plate Heat
Exchanger
It is the water-refrigerant plate type heat exchanger,
used to liquefy the high-temperature high-pressure
vapor refrigerant or evaporate the low-temperature
low pressure liquid refrigerant. Heat of condensation
is taken away by circulation water and heat for
evaporation is supplied also by circulation water.
Water Pump It is the power equipment for water circulation.
Expansion Tank
It is used to keep stable pressure of the water system.
The tank is charged with a certain volume of nitrogen
which is separated from the water side with a gasbag.
When pressure of the water side exceeds the nitrogen
pressure, the gasbag will expand and water enters
into the tank so as to lower the pressure of the water
system. In contract, when pressure of the water
system goes down, nitrogen in the tank will expel
water out to the water system.
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