20. boiler schematic
Figure 17
Key:
1 pressure gauge
2 siphon
3 central heating NTC sensor
4 105°C overheat safety thermostat
5 gas valve
6 flue-water exchanger
7 flame detector electrode
8 burner
9 ignition electrode
10 mixer with venturi
11 air/gas diaphragm
12 fan
13 flue joint
14 automatic air vent
15 hydraulic pressure sensor
16 boiler drain point
17 joint flue with flue thermostat
18 flue thermostat
IstructIons pErtaInIng to thE InstallEr
912.403.1 - IE
66