Unvented system (See figur 5)
To install an A.O. Smith water heater on an unvented cold water supply system a kit of valves and fittings fisted by the water reseach centre and complying with part G3 of the current building regulations should be used. Installation should be carried out generally as shown on the following diagram.
AOS 1119
Figur 5 - Connection diagram unvented systems
1) | Manual gas valve | A ) | Gas supply |
2) | Stop valve | B) | Hot water outlet |
3) | Expansion vessel | C) | Cold water inlet |
4) | T&P safety valve | D) | Hot water taps |
5) | Non return valve | E) | Return circulation |
6)Circulation pump
7)Drain valve
8)Pressure reducing valve
9)Expansion valve
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