Operation - Atlas Copco ga55+ Instruction Book

Water requiremts 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. Consult section
doubt, consult Atlas Copco.
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
anumber of requirements. See section
5.3

Operation

General
The compressor oil flow is controlled by two thermostatic valves (BV1 and BV2), ensuring reliable
compressor operation and optimum energy recovery.
Detailed description
Bypass valve (BV2) is integrated in the ER unit and controls the working of the oil/water heat exchanger (HE) of
the ER unit. Bypass valve (BV1) is integrated in the oil filter housing of the compressor and controls the working
of the main oil cooler (Co) of the compressor. Both bypass valves consist of an insert (thermostat) mounted in a
housing. Bypass valve BV2 has a separate housing, while BV1 is integrated in the oil filter housing.
90
Cooling water requirements
Cooling water requirements.
to minimise problems due to bad water quality. If in any
If in any doubt, consult Atlas Copco.
Instruction book
9096 3313 00