tiki GBFU 50 E5 Gebrauchsanweisung Seite 15

of the valve (depending on the type of the valve). The valve is operating properly if
the water comes out of the nozzle when the outlet is open.
An open-circuit, non-pressurised system (Fig. 4) requires the installation of a non-
return valve at the water inlet to prevent water draining out from the tank in the event
of the water supply running dry. This installation mode requires the use of an
instantaneous mixing 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.
Fig. 3: Closed (pressure) system
Legend:
1 - Pressure mixer taps
2 - Expansion tank
3 - Safety valve
a - Test valve
b - Non-return valve
4 - Funnel with outlet connection
5 - Checking fitting
No closing valve may be built-in between the water heater and return safety
valve, because with it the pressure protection would be impeded!
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.
Fig. 4: Open (non-pressure) system
6 - Pressure reduction valve
7 - Closing valve
8 - Non-return valve
9 - Low pressure mixer tap
H - Cold water
T - Hot water
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