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2202/B
EN-17
Water connection
English
Fig. 2: Water connection in the closed system
3.2. Water connection in the open system
In pressureless flow operation, the water can only be
withdrawn at one point.
Only fittings for open domestic hot water cylin
-
ders may be used.
This fitting is installed in the cold water inlet of the
domestic hot water cylinder.
A non-return valve must be installed that guaran
-
tees that water can not flow back from the do
-
mestic hot water cylinder into the water network.
It is advisable to install a drain nozzle.
Before connection to the power supply, the do
-
mestic hot water cylinder must be filled with wa
-
ter.
If the water in the device is heated, its volume ex
-
pands. This means that the drain pipe of the fitting
starts to drip. This behaviour is related to the func
-
tion. Excessive tightening of the two valves on the
fitting can not prevent this dripping.
Fig. 3: Water connection in the open system
1 Safety valve
2 Drain pipe safety assembly
3 Non-return valve
4 Drainage siphon
5 Test connections
6 Pressure reducer (optional)
7 Isolating valve
1
2
3
4
5
6
7
Domestic hot water cylinder
Domestic
hot water
drain
Safety group
Cold
water
inlet
Cold water inlet
1
2
3
1 Drain nozzle
2 Non-return valve
3 Isolating valve
Domestic hot water cylinder
Fitting
Swivelling outlet
Domestic hot water valve red
Cold water valve blue
Cold
water
supply
Domestic hot
water drain