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8
1
7
Closed (pressure) system
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
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.
The GBK combined water heater has an additional tubular heat transmitter for
heating domestic water using other energy sources (e.g. central heating, solar
collector, heat pump). The heating system using an electric heater and the system
using the heat transmitter can work simultaneously or individually. The combined
water heater is connected to the water pipeline and to an additional energy source.
The inlet of the heating medium into the heat transmitter is labelled with red paint
while the outlet is labelled with blue paint.
WARNING: When the temperature of the additional heat source drops and circulation
of water through the transmitter is enabled, uncontrolled reduction of heat can occur
in the water heater. When connecting the appliance to other heat sources, the
temperature regulation of the additional source must be carried out properly. The
temperature switch of the regulation should not be inserted through the connection
cable discharger.
The GBK heater can also be connected to the hot water circulation line. The hot
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2
3
6
4
5
Open (non-pressure) system
3
5
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