Operating instructions

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 that prevents the

pressure in the tank from exceeding nominal pressure by more than 0.1 MPa (1 bar).

The outlet opening on the relief valve must be equipped with an outlet for

atmospheric pressure. In order to provide correct operation of the safety valve,

periodical inspections of the relief valve must be carried out by the user to eliminate

any limescale and check if the safety valve is 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 the valve). The valve is operating properly if the water

comes out of the nozzle when the outlet is open. The heating of water in the heater

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

outflow of the safety valve. The drip can be piped into the drain by installing a

catching unit just below the safety valve. The drainpipe fitted under the safety valve

outflow must be piped down in a straight vertical line and located in an environment

free from the onset of freezing conditions.

In case the existing plumbing does not enable you to pipe the dripping water from the

return safety valve into the drain, you can avoid the dripping by installing expansion

tank on the inlet water pipe of the boiler. Volume of expansion vessel should

represent about 3% of water tank volume.

The hot water tank may be connected to the household water supply system without

a pressure-reducing valve provided the supply mains pressure is less than 0.6 MPa

(6 bar). In case of the mains pressure exceeding 0.6 MPa, a pressure-reducing valve

must be installed to ensure that the pressure on the supply side of the heater does

not rise above the nominal value.

Legend:

1 - 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 - Water tap

H - Cold water

T - Hot water

WARNING: The heating pump should not be in operation without water in the hot

water tank, because of danger of destruction of the compressor.

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