FläktGroup Multi-DENCO, Operation Manual, Page: 63 / 120

Multi -DENCO Medium Connections
FläktGroup DC-2013-0101-GB • Subject to modifications • R4-05/2018 63
NOTICE ON WATER USE!
– Under no circumstances should the water supply be fed from a water softening
system.
– Do not add disinfectants or anti-corrosive substances (irritants).
– It is not recommended to use industrial water or chemically and bacteriologically
polluted water for cooling circuits.
– Do not use demineralised water (e.g. osmosis/purified water)
– Where a salt exchange plant is in use at a site, the feed water to the unit should
by-pass this.
Water feed quality Unit Normal
tap water
Water with low salt
content
Min. Max. Min. Max.
Activity of hydrogen ions (pH) – 7 8,5 7 8,5
Specific conductivity 20 °C (
σ
R,20 °C)
μ
S/cm 350 1250 75 350
Dissolved solid materials (cR) mg/l (1) (1) (1) (1)
Solid residue at 180 °C (R180) mg/l (1) (1) (1) (1)
Total hardness (TH) mg/l CaCO
3
100 (2) 400 50 (2) 160
Temporary hardness mg/l CaCO
3
60 (3) 300 30 (3) 100
Iron + manganese mg/l Fe+Mn = 0,2 = 0,2
Chlorides mg/l Cl- = 30 = 20
Silica mg/l SiO
2
= 20 = 20
Residual chlorine mg/l Cl
2
= 0,2 = 0,2
Calcium sulphate mg/l CaSO
4
= 100 = 60
Metal contamination mg/l 0 0 0 0
Dissolvents, thinners, detergents, lubricants mg/l 0 0 0 0
(1) = General values, depending on specific conductivity: C
R
≅
0,65 x
σ
R,20 °C; R
180
≅ σ
R,20 °C
(2) = Not below 200 % of chloride content in mg/l Cl
(3) = Not below 300 % of chloride content in mg/l Cl
Tab. 6-5