Installation (only for approved contractors)
37
Tronic 4000 T – 6721843807 (2022/06)
Use suitable connection accessories for the hydraulic
connection of the appliance.
Fig. 11
[1] Galvanic insulation
[2] Pressure relief valve
[3] Non-return valve
[4] Reducer valve
[5] Cut-off Valve
[6] Drainage connection
[7] Expansion vessel
[8] Mixing valve
To avoid problems caused by sudden pressure changes in the
supply system, it is advisable to assemble a check valve
upstream of the appliance.
If there is a risk of freezing:
Disconnect the appliance from the electricity.
Vent the appliance ( chapter 4.6).
5.5 Pressure-relief valve
Install the pressure relief valve on the water inlet of the
appliance.
WARNING
Risk of damage to property!
Never obstruct the vent pipe of the pressure relief valve.
Never install any accessory between the pressure relief
valve and the cold water inlet (right side) of the electric
DHW cylinder.
If the water inlet pressure is between 1.5 and 3 bar, it is not
necessary to install a pressure reducing valve.
If the water inlet pressure is above these values, it is necessary:
to install a pressure reducing valve (Fig.11, [4]). The
pressure relief valve will activate whenever the water
pressure in the appliance is above 8 bar (± 1 bar), for
which reason it is necessary to plan a way of draining off
this water.
install an expansion vessel (Fig. 11, [7]) to stop the
pressure relief valve opening so frequently. The volume of
the expansion vessel should be equivalent to 5% of the
volume of the appliance.
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