20 PMML0291A rev.2 - 09/2014
WATER PIPING
Tank connections
The domestic hot water connections of the tank are located where
it is visible in the following images:
Water connections
Space heating DHW space
Connection be-
tween indoor unit
and tank (heating
coil inlet connec-
tion)
Connection be-
tween indoor unit
and tank (heating
coil outlet connec-
tion)
DHW inlet con-
nection (Cold
water to the tank)
DHW outlet connec-
tion (Hot water from
the tank)
DHW inlet
connection
DHW outlet con-
nection
Heating coil inlet
connection
Heating coil outlet
connection
Piping size
(mm (inches))
Heating coil DHW
From
indoor
unit
To
indoor
unit
From DHW
installation
To DHW
installation
DHWS-(195/260)
S-2.0H1E
Ø19.05
(3/4”)
Ø19.05
(3/4”)
Ø19.05
(3/4”)
Ø19.05
(3/4”)
5.1.3 Water quality
Heating coil and DHW circuit
CAUTION
• Water quality must be according to EU council directive 98/83 EC.
• Water should be subjected to ltration or to a softening treat-
ment with chemicals before application as treated water.
• It is mandatory to do not add any kind of antifreeze product to
the water circuit.
• To avoid deposits of scale on the heating coil surface it is man-
datory to ensure a high water quality with low levels of CaCO
3
.
• It is also necessary to analyse the quality of water by checking
pH, electrical conductivity, ammonia ion content, sulphur con-
tent, and others. Should the results of the analysis be not
good, the use of industrial water would be recommended for
the heating coil circuit.
Recommendations for the DHW circuit
The following is the recommended standard water quality.
Item
DHW
space
Tendency
(1)
Water
supplied
(3)
Corrosion
Deposits
of scales
Electrical Conductivity (mS/m)
(25°C) {µS/cm} (25 °C)
(2)
100~2000
Chlorine Ion (mg CI¯/I) max. 250
Sulphate (mg/l) max. 250
Combination of chloride and
sulphate (mg/l)
max. 300
Total Hardness (mg CaCO
3
/I) 60~150
NOTE
• (1): The mark “ ” in the table means the factor concerned with
the tendency of corrosion or deposits of scales.
• (2): The value showed in “{}” are for reference only according
to the former unit.
• (3): Water range will be according s/UNE 112076:2004 IN.
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