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1904 0504 83
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Attention: It is only allowed to turn the handle completely in or out. No in-
between position is allowed. 
The oil cooler bypass valve (BV1) starts closing the bypass line and opening the oil supply line from the 
main oil cooler (Co) at the lower limit of its temperature range. At the upper limit of its temperature 
range, the bypass line is completely closed and all the oil flows through the main oil cooler. 
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)  before  the  warm  oil  is  fed  to  the  oil/water  heat 
exchanger when using the compression heat as source for energy recovery.  
Thermostat BV1 starts to open at 60 ˚C (140 ˚F) and is completely open at 75 ˚C (167 ˚F). 
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The wheel (V1) of BV2 (bypass valve of the HE) is totally 
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Compressor start-up