Product description
2.5
Compressor control
Page 20
BOGE Operating instructions for C 16 N...C 30 N, C 16 F N...C 30 F N series screw compressors
Cooling water quality
The cooling units are fitted with nonferrous heat exchangers, as standard. To
avoid damage to these components and to guarantee a long term function, en-
sure that the substances contained in the cooling water used do not exceed
the following values.
Tab. 2.1: Maximum admissible concentration of the substances
2.5 Compressor control
Network pressure
For the compressor, the pressure downstream of the check valve is termed
network pressure. The control system switches the compressor on and off
during operation depending on the network pressure.
Operating states
All screw compressor controls are based on three basic operating states:
1. Load operation
–
The compressor delivers its maximum amount of compressed air.
–
It consumes its maximum energy.
Substances
Symbol
max. admissible concentration [ppm]
Ammonia
NH
3
< 2
Chloride < 70°F
Cl
100
Free chlorine
Cl
< 5
Iron Fe
< 2
Free carbon dioxide
CO
2
< 20
Manganese
Mn
< 1
Nitrate
NO
3
< 100
Oxygen
O
2
< 2
Silicon oxide
SiO
2
< 8
Sulphate
SO
4
< 60
Total dissolved solids
TDS
< 600
NOTICE!
If the specified limit values are exceeded, use cooling units made of other
materials.
Please consult BOGE service.
WARNING!
If the cooling water data changes, the cooling units may have to be rede-
signed. Incorrectly designed cooling units may cause malfunctions and the
compressor to switch off!
Please consult BOGE.
