Baxi LUNA3COMFORT Installers And Users Instructions page 37

Figure 21
Key:
1 Automatic by-pass
2 Water pressure switch
3 Three way valve
4 Gas valve
5 Expansion vessel
6 Ignition electrode
7 Central heating NTC sensor
8 Overheat safety thermostat
9 Flue-water exchanger
1.240 i
heating domestic gas
inlet water outlet
10 Flue hood
11 Flue thermostat
12 Flame detector electrode
13 Burner
14 Burner injectors
15 Automatic air vent
16 Pump and air separator
17 Boiler drain point
18 Manometer
19 Pressure relief valve
37
domestic heating
water inlet return
925.220.4 - EN