Closed (pressure) system
Legend: 1- Return safety valve
2- Bimetallic fuse
3- Non-return valve
4- Pressure reduction valve
5- Closing valve
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 0.5 MPa (5 bar). If the pressure exceeds
0.5 MPa (5 bar), a reduction valve must be installed. Prior to the electric connection the
water heater must obligatorily be filled 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.
POWER CONNECTION
The power lead must be fitted to the water heater prior to being connected to the power
supply. In order to do this you should first unscrew the protective cover off the water
heater. The water heater must be connected to the power supply in accordance with the
requirements set out in the relevant standards applying to electrical installations. For safety
reasons a switch should be installed on the lead connecting the heater to the power grid,
i.e. a switch disconnecting both power supply poles with the minimum of 3 mm distance
between the open contacts.
Legend:
1 - Thermostat
2 - Temperature safety device
3 - Heating element
4 - Light indicator
5 - Connector
L - Phase conductor
N - Neutral conductor
- Earth conductor
18
Open (non-pressure) system
6- Checking fitting
7- Funnel with outlet connection
H - Cold water
T - Hot water
Electric installation