2920 1381 02
20
Instruction book
2.6 Cooling water requirements
Following requirements are given as a general rule to prevent
cooling water problems. If in any doubt, consult Atlas Copco.
Recommended maxima - Recirculating Open
mg/l system system
Chloride (Cl
-
) . . . . . . . . . . . . . . . . < 600 < 150
Sulphate (SO
4
--
) . . . . . . . . . . . . . . < 400 < 250
Total solids . . . . . . . . . . . . . . . . . . < 3000 < 750
Suspended solids (as SiO
2
). . . . . . < 10 < 10
Free chlorine (Cl
2
) . . . . . . . . . . . . < 4 < 2
Ammonia (NH
4
+
) . . . . . . . . . . . . . < 0.5 < 0.5
Copper . . . . . . . . . . . . . . . . . . . . . < 0.5 < 0.5
Iron . . . . . . . . . . . . . . . . . . . . . . . . < 0.2 < 0.2
Manganese . . . . . . . . . . . . . . . . . . < 0.1 < 0.1
Oxygen . . . . . . . . . . . . . . . . . . . . . < 3 < 3
Carbonate hardness (as CaCO
3
) . . 50-1000 50-500
Organics (KMnO
4
Consumption) . < 25 < 10
No algae
No oil
Remark
Chloride and sulphate are interactive. In pass-through systems
the sum of the squares must not exceed 85,000. For recirculating
systems with proper controls and treatment, the sum of the
squares may be up to 520,000. Note that the sulphate value
must include any sulphite present.
Footnotes chapter 2
1) If the size does not comply with local legislation, the stricter of
the two shall apply.
2) For IEC approval:
- LC stands for loose conductors in the air; values according
to DIN VDE 0113 - EN 60204 T1 - IEC 204-1.
- MC stands for cables in open cable trunking system, in cable
trays or on walls; same values for loose conductors in a
conduit or in a cable trunking system; values according to
EN 60204-1 Table 5.
3) For CSA/UL approval:
- LC stands for loose copper conductors in the air.
- MC stands for not more than 3 loose copper conductors in a
raceway or in a cable; values according to CE Code handbook
Table 1 and Table 2.
- For CSA/UL conductors with AWG size, the sizes are valid
for cables with insulation of 85/90 degrees celsius.
3 Operating instructions
3.1 Initial start-up
3.1.1 Safety
The operator must apply all relevant safety precautions,
including those mentioned in this book.
3.1.2 User manual
Read the “User manual for Elektronikon regulator for GA5 up
to GA90C” to familiarize yourself with all regulator functions.
3.1.3 Outdoor/altitude operation
If the compressor is installed outdoors or if the air inlet
temperature can be below 0 degrees celsius, precautions must
be taken. In this case, and also if operating at high altitude,
consult Atlas Copco.
AV Air outlet valve
Dma Manual condensate drain valve
1 Condensate drain flexible for automatic drain
2 Condensate drain flexible for manual drain
3 Connection between flexible (2) and valve (Dma)
4 Bottle containing Atlas Copco Roto-injectfluid
Fig. 3.1 Components delivered loose with compressor (typical
examples)
AV
4
Dma
32
1
F022-1
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