Recovery water flow
The recovery water enters the unit at inlet connection (1). In heat exchanger (HE) the
compression heat is transferred from the compressor oil to the water. The water leaves heat
exchanger (HE) via outlet connection (2).
Water requirements for closed water circuits
The use of a closed water circuit minimises make-up water requirements. Therefore, the use of
soft or even demineralised water is economically feasible and eliminates the problem of scale
deposits. Although the heat exchanger is made of stainless steel, the water circuit connected to
the compressor may require corrosion inhibitors.
Add an anti-freeze product such as ethylene-glycol to the water in proportion to the expected
temperature to avoid freezing.
Water requirements for open water circuits
For open, non-recirculation water circuits, the major problems usually encountered are related to
deposit control, corrosion control and microbiological growth control. To minimize these
problems, the water should meet a number of requirements.
6.3 Operation
Description
The compressor oil flow is controlled by two thermostatic valves (BV1 and BV2), ensuring reliable
compressor operation and optimum energy recovery.
Bypass valve (BV1) is integrated in the oil filter housing of the compressor and controls the oil
flow through the main oil cooler (Co) of the compressor. Bypass valve (BV2) controls the oil flow
through the oil/water heat exchanger (HE) of the ER unit. Both valves consist of an insert
(thermostat) mounted in a housing.
Instruction book
108 2920 7109 51
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