Baxi LUNA HT 280 Installers And Users Instructions page 33

26.2 Boiler schematic LUNA HT 1.120 - HT 1.240 HT 1.280
heating storage
inlet tank feed
Figure 21
Legende:
1 heating delivery cock
2 gas service cock
4 boiler filling tap
5 heating return cock
10 hydraulic differential pressure sensor microswitch
11 manometer
12 pressure relief valve
13 boiler drain point
14 pump and air separator
15 automatic air vent
17 gas valve
18 flue-water exchanger
19 flame detector electrode
20 main burner
21 ignition electrode
gas domestic water heating
inlet return
22 air/gas mixture header
23 mixer with venturi
24 gas diaphragm
25 fan
26 flue thermostat
27 coaxial fitting
28 automatic air vent
29 expansion vessel
30 fumes header
31 siphon
32 105°C overheat thermostat
33 central heating NTC sensor
34 3-way valve motor
35 diverter valve assembly
36 hydraulic differential pressure sensor
37 automatic bypass
33