6
EN
Closed (pressure) system
Open (non-pressure) system
Between the water heater and safety valve, no closing valve may be built in
because it could impede the function of the safety valve.
The heater can be connected to the domestic water supply network without a
pressure-reducing valve if the pressure in the network is lower than the nominal
pressure. If the pressure in the network exceeds the nominal pressure, a pressure-
reducing valve must be installed.
Before connecting it to the power supply, the water heater must be filled with
water.
When filling the heater for the first time, the tap for the hot water on 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.
Connect the heater to the power supply network in compliance with the standards
related to electric devices. Since the heater is not furnished with a breaker capable of
shutting off the heater from the power supply network, a suitable switch should be
installed between the heater and the network, which has the capacity to break off all
supply poles and has an open contact clearance of min. 3mm.
The heater may be connected as single stage or as double stage heater. The
required heating power and mode of operation is selected by means of adequate
cable connection to the terminal clamp PS1 and by mounting the enclosed electric
bridges in the terminal clamp PS1 and PS2 (see wiring diagram and options of wiring
diagram).
Before connecting to power supply, install a correct cable cord taking into account the
selected connecting option. Before installing the cable cord, remove the protective
cover from the heater.
WARNING: Before repair or maintenance intervention, disconnect the heater
from power supply.
1
7
5
3
5
4
6
3
2
8
Legend:
1 - Safety valve
2 - Test valve
3 - Non-return valve
4 - Pressure reduction valve
5 - Closing valve
6 - Checking fitting
7 - Funnel with outlet connection
8 - Expansion tank
H - Cold water
T - Hot water
