Riello ACS 35 Manual page 11

WATER CONNECTIONS
CONNECTION TO THE WATER CIRCUIT
1 Safety valve
2 Shut-off valve
3 Pressure gauge
4 Non-return valve
5 Pressure reducer valve (necessary for K>=6 bar)
6 Fine mesh filter
b
The pipes between the product and the storage cylinder should be kept as short as possible.
b
Connect the product to the domestic cold water supply as shown.
b
Install a filter in the domestic hot water circuit to cap-
ture impurities and protect the circuit. Also install a
non-return valve and an expansion vessel along the
domestic cold water supply.
If the water supply is harder than 25 to 30 °Fr, a suitable
treatment system should be installed upstream from the
water heating system to prevent corrosion and the forma-
tion of limescale.
Bear in mind that, because of the low thermal conductivity
of limescale, even deposits of only a couple of millimetres
in thickness can significantly reduce the efficiency of the
water heating system.
The ACS 20 hot water mixer is made from materials
that conform to the requirements of Ministerial Decree
174/2004 (Italy) implementing Council Directive 98/83/
EC.
All fittings are assembled in the factory. It is neverthe-
less advisable to check their tightness after installing the
product. It is also necessary to test the product for water
tightness at operating pressure when putting it into ser-
vice.
b
Values in excess of those specified in the table
alongside can damage the product and automati-
cally invalidate the warranty. It is therefore important
to analyse the water to ensure that all values are
within the limits given in the table.
1
3
2 4
7
11
6
5 2
7 Expansion vessel (accessory)
K Fitting for domestic cold water supply
UNIT OF
WATER PARAMETER
MEASURE
PH
Saturation index (PH
delta)
Total hardness
Conductivity μS/cm
Solid substances
Free chlorine
Hydrogen sulphide
Ammonia
Bicarbonate
Bicarbonate/Hydrogen
sulphide
Sulphur
Nitrate
Nitrite
Sulphate
Manganese
Dissolved iron
Free, aggressive car-
bon dioxide
K
MAXIMUM
PERMISSIBLE
VALUE FOR
COPPER-
BRAZED HEAT
EXCHANGERS
7-9 (indicative of
saturation)
-0.2<0<+0.2
°Fr 15-30
10...500
mg/l <30
mg/l <0.5
mg/l <0.05
mg/l <2
mg/l <300
mg/l >1.0
mg/l <1
mg/l <100
mg/l <0.1
mg/l <100
mg/l <0.1
mg/l <0.2
mg/l <20