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30. FUNCTIONAL CIRCUIT DIAGRAM
DHW DHW
outlet inlet
Figure 20
Key:
1 boiler
2 boiler probe
3 DHW exchanger
4 expansion vessel
5 boiler drain tap
6 NTC heating probe
7 safety thermostat
8 ignition electrode
9 water-fumes exchanger
10 fumes conveyor
11 negative pressure point
12 positive pressure point
13 concentric connector
14 air pressure switch
15 fan
16 flame detection electrode
17 gas train with injectors
INSTRUCTIONS FOR FITTERS
280 Fi
heating
return
18
safety valve on heating circuit 3 bar
19
differential hydraulic pressure switch
20
automatic vent valve
21
pump with air separator
22
gas valve
23
heating return filter
24
automatic by-pass
25
gas tap
26
pressure gauge
27
burner
28
three-way valve
29
three-way valve motor
30
boiler filling tap
31
safety valve on DHW circuit 8 bar
32
storage boiler discharge tap
33
flow adjuster
34
water supply tap
67
heating
gas
delivery
71.05086.02 - EN
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