Closed (pressure) system
Legend:
1 - Safety valve
2 - Test valve
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 fi lled with water. By fi rst fi lling the tap for the hot water upon
the mixing tap must be opened. When the heater is fi lled with water, the water starts to run
through the outlet pipe of the mixing tap.
CONNECTION OF THE WATER HEATER TO THE ELECTRIC NETWORK
Before connecting to power supply network, install a power supply cord in the water heater,
with a min. diameter of 1,5 mm
removed from the water heater.
The connection of water heater to the electric network must be performed according to
standards for electric installation. Install a disconnect switch (separating all poles from the
power supply network) between the water heater and the permanent power connection, in
compliance with the national regulations.
(H05VV-F 3G 1,5 mm
2
Open (non-pressure) system
6 - Checking fi tting
7 - Funnel with outlet connection
H - Cold water
T - Hot water
). For it the protection plate must be
2
9