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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.
1) Manual gas valve
2) Stop valve
3) Expansion vessel
4) T&P safety valve
5) Non return valve
6) Circulation pump
7) Drain valve
8) Pressure reducing valve
9) Expansion valve
Figur 5 - Connection diagram unvented
systems
A) Gas supply
B) Hot water outlet
C) Cold water inlet
D) Hot water taps
E) Return circulation
AOS 1119