Quincy Compressor QGS 90, Instruction Book

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On compressors with a maximum pressure of 13 bar (175 psi), BV2 starts opening at 60 ˚C (140
˚F) and is completely open at 75 ˚C (167 ˚F).
The housing of BV2 is provided with a special wheel (V1), allowing to control the energy recovery
system.
As can be seen on the ER label, the ER unit is integrated in the oil circuit and will recover energy
when the wheel is completely turned in clockwise.
When the wheel is turned out anticlockwise, the heat exchanger (HE) is bypassed and no energy
will be recovered.
Valve housing of BV2 with wheel V1
ER label
Attention: It is only allowed to turn the wheel completely in or out. No in-between position is
allowed!
The oil cooler bypass valve (BV1) starts closing the bypass over the oil cooler (Co) at the lower
limit of its temperature range. At the upper limit of its temperature range, the bypass is completely
closed and all the oil flows through the oil cooler (Co).
BV1 must have a higher opening temperature (set point) than BV2 in order to prevent the heat
from being dissipated in the compressor oil cooler (Co) rather than in the oil/water heat
exchanger (HE) when using the compression heat as source for energy recovery.
Instruction book
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