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EN • 16
ENFRRU PL DE IT ES NL
Delta Pro S / Delta Pro Pack : 664Y4900 • E
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DOMESTIC HOT WATER CONNECTION
EXAMPLE OF CONNECTION WITH
THERMOSTATIC MIXER VALVE
1. 7 bar hot water safety valve (as standard)
2. Pressure reducer
3. Temperature control valve
4. Hot water circulator (optional)
5. Non-return valve
6. Hot water expansion tank (as standard on Pro Pack, 2 litres)
7. Cold water feed valve
8. Hot water outlet
9. Drain down valve
10. Syphon valve
11. Isolating valve
IMPORTANT
It is essential that the DHW cylinder is filled and pressurised
before filling the heating circuit.
INSTALLATION
Pressure reducer
If the water mains pressure is greater than 6 bar, a pressure reducer calibrated
to at least 4.5 bar must be fitted (UK regulations apply).
Hot water safety valve
The hot water safety valve is at 7 bar; valve discharge must be connected to
drain (UK regulations apply).
Hot water expansion tank (as standard on Pro Pack, 2 litres)
Installing a hot water expansion tank avoids any risk of pressure surges due to
water hammer or pressure variations.
Optional hot water circulation
If the tank is situated a long way from the point of use, theninstalling a closed
return circuit can provide a faster supply of hot water at all times.
IMPORTANT
As a safety measure against burns, we strongly
recommend installing a thermostatic mixer.
Optional fittings available
Pressure reducer Ø 3/4"
Temperature mixing valve Ø 3/4"
Expansion tank 5 litres
If there is a risk of low pressure in the hot water circuit
(installation of a Delta Pro S & Pro Pack on the roof of a
building), it is essential to install a vacuum breaker device onto
the cold water supply.
16


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