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3.4
Boiler Hydraulic diagram.
Key:
1 - Domestic hot water flow switch
2 - System filling valve
3 - Flow limiter
4 - Domestic hot water probe
5 - Gas valve
6 - System expansion vessel
7 - Burner
8 - Primary heat exchanger
9 - Fan
10 - Sealed chamber
11 - Flue pressure switch
12 - Flow probe
13 - Safety thermostat
14 - Air vent valve
15 - Boiler pump
16 - System draining valve
17 - System pressure switch
18 - Plate heat exchanger
19 - 3-way valve (motorised)
20 - By-pass
21 - 3 bar safety valve
G - Gas supply
AC - Domestic hot water outlet
AF - Domestic hot water inlet
R - System return
M - System flow
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