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7 PLUMBING FIXTURE
Water inflow and outflow is indicated with different colour terminals on the heater tubes. Cold water supply
is indicated with blue and hot water outflow is indicated with red. There are two ways of connecting
the water heater to water network. Closed, pressure connection system allows water withdrawal at multiple
supply (withdrawal) points whilst open flow system allows one supply (withdrawal) point only. With regard
to the selected way of connection, you need to purchase suitable combination faucets.
For the open flow system you need to mount a return valve in order to avoid water outflow from the boiler
if water supply gets discontinued. For this type of connection, you have to use the flow combination faucet.
Due to heating, the volume of water increases, which causes water dripping from the combination faucet
pipe. You will not prevent water from dripping by strong tightening of the combination faucet valve but you
may damage the combination faucet.
For the closed pressure connection system you need to use pressurised combination faucets at the
withdrawal points. You have to attach a safety valve to the filling pipe to avoid increase of pressure in the
tank above the rated pressure. During water heating in the heater, the water pressure in the tank increases
until it reaches the limit set on the safety valve.
Open (flow) system
The „above-supply-point" version
The „below-supply-point" version
Explanation:
1 - Safety valve
2 - Back pressure valve
3 - Test valve
4 - Reduction valve
5 - Shut-off valve
Closed (pressure) system
The „above-supply-point" version
The „below-supply-point" version
Figure 1
6 - Test adaptor
7, 7a - Flow combination faucet
8 - Funnel with connector to drain from the safety valve
H - Cold water
T - Hot water
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