GeneralAire DS50 LC Elite Steam - Manual (Page 11)

DS 50 / DS 50 LC +030222065 Rev. 1.2 11
3.3 Plumbing
3.3.1 Water Characterisitc Requirements
The humidifier must be supplied with water with the following characteristics:
• pressure between 20psi and 110psi or 0.1 and 0.8 MPa (1 and 8 bar)
• temperature between 33°F and 104°F or 1°C and 40°C
• flow-rate minimum of 0.83 L/min or 0.22gpm
• hardness no greater than 40°fH (equal to 400 ppm³ of CaCO), conductivity: from 125 to 1250
μS/cm
• absence of organic compounds
• the characteristics of the water of supply must fall within the following limits:
LIMIT VALUES FOR LOW SALT CONTENT WATER LIMIT VALUES FOR LOW NORMAL WATER
Units Min Max Units Min Max
Hydrogen ions (pH) 7 8.5 Hydrogen ions (pH) 7 8.5
Specific conductivity (R,20°C) μS/cm 300 Specific conductivity (R,20°C) μS/cm 125 500
Total dissolved solids (c R) mg/l (*) (*) Total dissolved solids (c R) mg/l (*) (*)
Dry residue at 180°C mg/l (*) (*) Dry residue at 180°C mg/l (*) (*)
Total hardness mg/l CaC
³
O 150 400 Total hardness mg/l CaC
³
O 0 200
Temporary hardness mg/l CaC
³
O = 200 Temporary hardness mg/l CaC
³
O = 150
Iron + Manganese mg/l Fe + Mn = 0.2 Iron + Manganese mg/l Fe + Mn = 0.2
Chlorides ppm Cl = 30 Chlorides ppm Cl = 20
Chlorides mg/Si
2
O = 20 Chlorides mg/Si
2
O = 20
Chlorine residue mg/l Cl- = 0.2 Chlorine residue mg/l Cl- = 0.2
Calcium sulphate mg/l CaS
4
O = 100 Calcium sulphate mg/l CaS
4
O = 60
Tab.3.d Tab.3.e
(*) Values dependent on the specific conductivity: in general: cR~=0.65* σR, 20°C; R180~=0.9*σR, 20°C
Note: There is no relationship between the hardness and conductivity of water.
Water Conductivity must be matched by specifications of the steam cylinder. Check or know the water conductivity of
the proposed site before installation. Replace the steam cylinder before startup if not correct. See Table 3.f right.
DS 50 / DS 50 LC models Conductivity μS/cm Steam Cylinder
DS50 300-1250 50-14
DS50LC 125-500 50-15
Tab.3.f
The following water types are not acceptable:
1. Softened water as this will lead to foam, electrode corrosion and greatly shortened
cylinder life.
2. Water containing disinfectants or corrosion inhibiters, as these are potential irritants.
3. Industrial water, boiler water or water from cooling circuits.
4. Any potentially chemically or bacteriologically contaminated water.
5. Heated water.
3.3.2 Water
Supply Connection
We recommend the connection between the fill valve and the water supply line by
a soft poly hose capable of absorbing the water hammering in order to avoid
damage to the fill valve itself. The water line may be routed through the back or
through the bottom of the unit. With poly tubing, a tubing support must be used
to prevent tubing collapse and leaks. The fitting then threads onto the fill valve
inlet located on the bottom of the humidifier using a 3/4” G connection. Note
that there is a strainer built into the fill valve fitting underneath the unit,
which will require periodic cleaning, so be sure to allow clearance for
access. Length of 1/4” tube should be kept to less than 1M or 3 ft.
Fill valve and filter
Water drain
Fig. 3.g
Fig. 3.h
Extension tube
Water drain outlet