Multi-DENCO Medium Connections
FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020 75
6.4 Humidifier water connections (optional)
The humidifier unit must be connected to a standard piped cold water supply. All mains
water pipework to humidifiers must be installed to national and local standards, in par-
ticular, local water authorities' regulations and requirements.
• Connect the humidifier using a fitted flexible hose and a compression fitting.
• The water supply should have a stop cock adjacent to the unit.
• The earth bonding (supplied) must be connected to the incoming water supply and
also to the drain line if electrically conducting tubing is used for instance copper pipe.
Supply water quality In general the water supply feed to the humidifier must be normal quality drinking water
but must comply with the following parameters:
– Water feed pressure between 0.1 and 0.8 MPa (1 and 8 bar)
– Temperature between 1 and 40 °C
– Hardness not exceeding 400 ppm equalling CaCO3 (40 °fH)
– Conductivity 125 to 1250 µS/cm (microSiemens/cm) (depending on bottle used)
– No organic substances
In operation, the humidifier can produce hot water vapour. The vapour, tubing that
it is directed through and areas that it has been in contact with can be hot and will
cause scalding or burns.
• Always allow time for the humidifier and affected regions to cool sufficiently before
starting any work
• Do not touch affected regions with unprotected skin.
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 (VR,20 °C) PS/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
V
R,20 °C; R
180
#
V
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. 6-7
To Next Page
Loading...
