Shini SIC-A-R2, Operation Manual

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Hot-air bypass function: the compressor continues working when process water
is cooled down to required temperature, then the hot-air bypass valve opens as
the temperature drops to its set value. A part of the refrigerant from the
compressor passes through the by-pass valve and then reaches evaporator,
balancing out part of the machine refrigerating capacity and then goes back to
compressor without passing through the condenser. With the help of hot-air
bypass valve, the system can stay in an balanced condition and meanwhile can
keep control accuracy within
± 1
℃
B. Air-cooled Series
Picture 2-2: Working Principle
When SIC-A-R2 air-cooled water chiller starting-up, compressor starts working.
Refrigerant is compressed into high temperature high pressure gas in the
process form B to C, and then be cooled when passing through condenser and
changed into liquid. Heat is taken away by the cooling air. In the process from C
to D to E and F, liquid refrigerant is dried and filtered by the drier filter. After that,
it passes through solenoid valve, level sensor and then reaches the expansion
valve. In the process from F to G, the high pressure liquid refrigerant is throttled
and depressurized by heat expansion valve and temperature goes down. In the
process from G to A, chilled water absorbs the heat of process water in
evaporator and returns back to the compressor. This heat exchange process
repeats until process water is cooled down to requirement temperature.
Hot-air bypass function: the compressor continues working when the process
water is cooled down to required temperature, then the hot-air bypass valve