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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
Figure 4 - Connection diagram
(unvented system)
8) Pressure limiting valve
9) Expansion valve
A) Gas supply
B) Hot water delivery
C) Cold water inlet
D) Hot water taps
E) Return circulation
See Figure 4.
A.O. Smith water heaters are tested to
a maximum pressure of 12 bar and a
maximum working pressure of 8 bar.
AOS 0581