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Capacity control

operation provided for effecting automated control on the varying load for refrigeration:
1.On/Off method: compressor is switched on or off in the absence of load.
2.Variable motor speed of the compressor.

3. cylinder unloading in a multi cylinder compressor.
4. hot gas bypass (bypassing condensor)
5. direct injection of hot gas to evaporator.
6. evaporator pressure control 
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