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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 - Fumes hood
10 - Sealed Chamber
11 - Flue pressure switch
12 - Fan
13 - Delivery probe
14 - Safety thermostat
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15 - Vent valve
16 - Boiler pump
17 - System draining valve
18 - System pressure switch
19 - Plate heat exchanger
20 - Three-way valve (motorised)
21 - By-pass
22 - 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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