Aquarea PAW-TG40C1E3STD Руководство - Страница 14

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CONNECTION TO THE WATER SUPPLY

Connection to water supply should be made according to the markings for the connections, as defined in the previous Chapter.

For safety reasons the supply pipe must be fitted with a safety valve or, alternatively, a valve of the safety class that prevents the

pressure in the tank from exceeding the nominal pressure by more than 0.1 MPa (1 bar). The outlet opening on the safety valve

must be equipped with an outlet for atmospheric pressure. The heating of water in the storage tank causes the pressure in the tank

to increase to the level set by the safety valve. As the water cannot return to the water supply system, this can result in dripping

from the outlet opening of the safety valve. The drip can be piped to a drain by installing a catching unit just below the safety

valve. The drain installed below the safety valve outlet must be piped down vertically and placed in an environment that is free

from the onset of freezing conditions.

In case you want to avoid water dripping from the safety valve, an expansion tank for domestic water with at least 5 % of the

volume of the storage tank should be installed on the inlet pipe of the storage tank.

To ensure proper functioning of the safety valve, the user should perform regular controls to remove limescale and make sure the

safety valve is not blocked. To check the valve, open the outlet of the safety valve by turning the handle or unscrewing the nut of the

valve (depending on the type of valve). The valve is operating properly if the water comes out of the nozzle when the outlet is open.

Image 3: Closed (pressure) system

The storage tank can be connected to the domestic water supply network without a pressure regulator if the pressure in the

network is lower than the nominal pressure (see the label). If the pressure in the network exceeds the nominal pressure, a pressure

regulator must be installed.

HEATING CIRCUIT AND ELECTRIC CONNECTION

Image 4: the basic hydraulic connection

Sensor

Electric heating

3-way reversing valve

For the heating circuit

KEY

Drain valve

2 Expansion tank

3 Safety valve

a - Test valve

b - Non-return valve

4 Funnel outlet to the drain

5 Test unit

6 Pressure-reducing valve

7 Stop valve

8 Pressure mixer taps

H Cold water

T Hot water