6
D Series Modular Air-cooled Scroll Chillers
Service Manual
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5 OPERATION PRINCIPLE
5.1 Schematic Diagram
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The low-pressure superheated refrigerant vapor from the evaporator is drawn into
the compressor through which the low-pressure vapor is compressed to hi-temperature and hi-pressure
refrigerant vapor. Then, the refrigerant vapor passes the condenser and turns to saturated or sub-
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evaporates by absorbing heat from the second refrigerant and then is drawn into the compressor again.
The second refrigerant is then transferred to where air cooling is required.
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During the reverse refrigeration cycle, a 4-way valve is used to make the
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vapor coming out from the compressor directly releases heat to the secondary refrigerant and turns to
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is drawn into the compressor again. The second refrigerant which has approached the temperature set
point is then transferred to where air heating is required.
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