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[日期]
20
Vol. 1.2 © 2020 Hanbell Precise Machinery Co., Ltd.
All rights reserved
In piping, the proportional valve should be installed as close as possible to the evaporator, and also at
another side of suction entry (motor side) to lower the noises.
Besides, a muffler or shield should be installed at the evaporator to prevent splashed liquid refrigerant,
which may damage the compressor.
Note1: The system with hot gas bypass is inefficient. It should be avoided whenever possible. Many
system applications still require hot gas bypass in order to avoid surge or maintain constant
chilled water temperatures from zero load to full load.
Note2: Required flow for HGBP depends on the difference between required minimum cooling
capacity and the minimum load compressor can reach. If the IGV is at minimum opening and
cooling capacity is 50%, and end user needs 20%. The pipe diameter and flow need to be
considered based on the 30% difference.
3.6 Middle pressure stop valve
Between the ECO port of the compressor and the economizer, it is recommended to install a stop valve
near the middle pressure port, it will avoid liquid goes back to compressor ECO port when compressor
running at partial loading. Under partial loading, liquid refrigerant entering the economizer might be
poured into the ECO port instead of the suction port.
