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CONNECTION TO THE WATER SUPPLY
The water heater connections for the in-flowing and out-flowing water are colour-coded.
The connection for the supply of the cold water is coloured blue, while the hot water outlet is coloured
red.
The water heater may be connected to the water supply in two ways. The closed-circuit pressure
system enables several points of use, while the open-circuit (Fig. 1) gravity system enables a
single point of use only. The mixer tabs must also be purchased in accordance with the selected
installation mode .
The open-circuit gravity system requires the installation of a non-return valve in order to prevent the
water from draining out of the tank in the event of the water supply running dry or being shut down. This
installation mode requires the use of an instantaneous mixer tap.
As the heating of water expands its volume, this causes the tap to drip. The dripping cannot be
stopped by tightening it further; on the contrary, the tightening can only damage the tap. The closed-
circuit (Fig. 2) pressure system requires the use of pressure mixer taps. For safety reasons the upply
pipe must be fitted with a return safety valve or alternatively, a valve of safety class that prevents the
pressure in the tank from exceeding the nominal pressure by more than 0.1 MPa. The outlet
pening on the relief valve must be equipped with an outlet for atmospheric pressure.
The heating of the 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 the dripping
from the outlet of the safety valve. The drip can be piped to the drain by installing a catching unit just
below the safety valve.
The closed-circuit (Fig. 2) pressure system requires the use of pressure mixer taps. For safety sons
the supply pipe must be fitted with a return safety valve or alternatively, a valve of safety class that
prevents the pressure in the tank from exceeding the nominal pressure by more than 0.1 MPa.
The outlet opening on the relief valve must be equipped with an outlet for atmospheric pressure.
The heating of the 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 the dripping
from the outlet of the safety valve. The drip can be piped to the 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 located in the environment that is 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 a 3-litre expansion tank on the inlet water pipe of the boiler.
In order to provide correckt operation of the relief valve, periodical inspection of the relief valve must
be carried out by the user. Between the water heater and return safety valve no closing valve may be
built-in because with it the function of return safety valve would be impeded. The water heater may
be connected to the water network in the house without reduction valve if the pressure in the network
is lower than 0.6 MPa (6 bar). If the pressure exceeds 0.6 MPa (6 bar), a reduction valve must be
installed. Prior to the electric connection the water heater must obligatory be filed with water. By first
filling the tap for the hot water upon the mixing tap must be opened. When the heater is filled with water,
the water starts to run through the outlet pipe of the mixing tap.
EN
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