Instruction Book
34
9828 0934 73
Air and refrigerant flow diagram for water-cooled
QPVS-650, QPVS-850 and QPVS-1050
Description
The condenser pressure must be kept as constant as possible to obtain stable operation, therefore:
•
For air-cooled versions, the regulator stops and starts the cooling fans.
•
For water-cooled versions, the water regulating valve in the water outlet regulates the cooling water
flow.
When at partial or no load the dew-point pressure stays below the set-point, the regulator opens solenoid
valve (210) and hot, high-pressure gas is fed through hot-gas by-pass valve (208) to the evaporator circuit to
prevent the evaporator temperature from dropping below 0 ˚C (32 ˚F).
