A.O. Smith COF 199, Инструкция по установке, эксплуатации и обслуживанию

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2.1.2.2 Unvented systems
To install an A.O. Smith water heater on an unvented cold
water supply system a kit of valves and fittings listed by
the water research centre and complying with part G3 of
the current building regulations and BS 7206 should be
used. Installation should be carried out generally as
shown on figure 4.
1) Pressure limiting valve
3) T&P valve
4) Stop valve
5) Non return valve
6) Circulation pump
7) Shunt pump
9) Drain valve
11) Service valve
12) Temperature meter
14) Hot water supply
15) Expansion valve
16) Expansion vessel
A) Cold water
B) Hot water
C) Return circulation
Figure 4 - Typical UK unvented system.