User manual

12
ENG
“UEX-PLUS” +03U220621 - rel. 1.4 - 04.08.2009
installeruserservice
2.1 Supply water
Only use mains water with:
pressure between 0.1 and 0.8 MPa (14.5 and 116 PSI), temperature •
between 1 and 40 °C (33.8 and104 °F) and an instant ow-rate no lower
than the rated ow of the ll solenoid valve, the connection is G3/4M (see
par. “Technical specications” page 47);
range hardness 10° to 40 °f (equal to 400 ppm of CaCO•
3
), conductivity:
75 to 1250 µS/cm;
no organic compounds.•
supply water
characteristics
unit of
measure
normal
water
water with low
salt content
min. max. min. max.
Hydrogen ions (pH) 7 8.5 7 8,5
Specic conductivity at
20°C (
σ
R, 20 °C
)
µS/cm 300 1250 75 350
Total dissolved solids (c
R
) mg/l (
1
) (
1
) (
1
) (
1
)
Dry residue at 180°C (R
180
) mg/l (
1
) (
1
) (
1
) (
1
)
Total hardness (TH) mg/l CaCO
3
100
(2)
400 50
(2)
150
Temporary hardness mg/l CaCO
3
60
(3)
300 30
(3)
100
Iron + Manganese mg/l Fe+Mn = 0.2 = 0.2
Chlorides ppm Cl = 30 = 20
Silica mg/l SiO
2
= 20 = 20
Residual chlorine mg/l Cl- = 0.2 = 0.2
Calcium sulphate mg/l CaSO
4
= 100 = 60
Metallic impurities mg/l 0 0 0 0
Solvents, thinners,
detergents, lubricants
mg/l 0 0 0 0
Tab. 3.a
(1)
= values depend on the specic conductivity; in general:
TDS ≅0,93 * σ
R, 20 °C
;
R
180
≅ 0,65 * σ
R, 20 °C
(2)
= not less than 200% of the chloride content in mg/l CL
(3)
= not less than 300% of the chloride content in mg/l CL
There is not reliable relationship between hardness and conductivity of the
water.
Important:
do not treat the water with softeners, this may cause foam, aecting the
•
operation of the unit;
do not add disinfectants or anticorrosive compounds to the water, as •
these are potential irritants;
the use of well water, industrial water or water from cooling circuits and, •
in general, any potentially chemically or bacteriologically contaminated
water is not recommended.
2.2 Drain water
this contains the same substances dissolved in the supply water, however •
in larger quantities;
it may reach a temperature of 100 °C (212 °F);•
it is not toxic and can be drained into the sewerage system.•
2.3 Drain tempering
The unit is tted with a tempering valve that, opening at the same time as
the drain valve, adds cold water to the drain line, thus ensuring a maximum
temperature of the drain water of 60°C/140°F.