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© STULZ GmbH, Hamburg
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4 WATER CONNECTIONS
Before making the connections, ensure that the machine is disconnec ted from the mains power supply.
4.1 Characteristics of the supply water
The humidifier must be supplied with mains water with the following characteristics:
• pressure between 0.1 and 0.8 MPa (1 and 8 bar), temperature between 1 and 40 °C and instant flow-rate no lower
than the rating of the fill electrovalve
• hardness no greater than 22 °dH (equal to 400 ppm of CaCO
3
), conductivity: from 125 to 1250 µS/cm
• absence of organic compounds
• the characteristics of the water of supply must fall within the following limits:
A LIMIT VALUES FOR THE SUPPLY WATER TO AN IMMERSED ELECTRODE HUMIDIFIER RUNNING
ON NORMAL WATER
Tab. 4.1.1
(*) Values dependent on the specific conductivity; in general: c
R
≅
0,65 *
σ
R
,
20 °C
; R
180
≅
0,9 *
σ
R, 20 °C
B LIMIT VALUES FOR THE SUPPLY WATER TO AN IMMERSED ELECTRODE HUMIDIFIER RUNNING
ON WATER WITH A LOW SALT CONTENT
Tab. 4.1.2
(*) Values dependent on the specific conductivity; in general: c
R
≅
0,65 *
σ
R
,
20 °C
; R
180
≅
0,9 *
σ
R, 20 °C
A G
3
/
4
M fitting is used for the water connection.
Note:
No relationship can be demonstrated between the hardness and the conductivity of the water.
IMPORTANT WARNING:
The water does not need to be treated with softeners! This may lead to the formation of foam,
with potential operating problems or anomalies!
The following are not recommended:
1. the use of well water, industrial water or water from cooling circuits and, in general, any potentially chemically or bacte-
riologically contaminated water;
2. the addition to the water of disinfectants or corrosion inhibiters, as these are potential irritants.
pH
-
7
8.5
R, 20 °C
-
µS/cm
300
1250
c
R
-
mg/l
(*)
(*)
R
180
-
mg/l
(*)
(*)
TH
-
mg/l CaCO
3
150
400
-
mg/l CaCO
3
=
200
-
mg/l Fe + Mn
=
0.2
-
ppm Cl
=
30
-
mg/l SiO
2
=
20
-
mg/l Cl-
=
0.2
-
mg/l CaSO
4
=
100
pH
-
7
8.5
R, 20 °C
-
µS/cm
125
500
c
R
-
mg/l
(*)
(*)
R
180
-
mg/l
(*)
(*)
TH
-
mg/l CaCO
3
0
200
-
mg/l CaCO
3
=
150
-
mg/l Fe + Mn
=
0.2
-
ppm Cl
=
20
-
mg/l SiO
2
=
20
-
mg/l Cl-
=
0.2
-
mg/l CaSO
4
=
60
Limits
Min Max
Hydrogen ions
Specific conductivity at 20 °C
Total dissolved solids
Dry residue at 180 °C
Total hardness
Temporary hardness
Iron + Manganese
Chlorides
Silica
Chlorine residue
Calcium sulphate
Limits
Min Max
Hydrogen ions
Specific conductivity at 20 °C
Total dissolved solids
Dry residue at 180 °C
Total hardness
Temporary hardness
Iron + Manganese
Chlorides
Silica
Chlorine residue
Calcium sulphate
