65
925.916.2 - GB
InstructIons pertaInInG to the InstaLLer
24. boIler sChematIC
Figure 21
0803_2401 / CG_2036
heating
domestic water
gas
domestic water
heating
inlet
outlet
inlet
return
Legende:
1
heating delivery cock
2
gas service cock
3
gas valve
4
boiler filling tap
5
heating return cock
6
pressure relief valve
7
manometer
8
boiler drain point
9
pump and air separator
10
NTC central heating return sensor
11
flue-water exchanger
12
flame detector electrode
13
main burner
14
ignition electrode
15
air/gas mixture header
16
mixer with venturi
17
gas diaphragm
18
fan
19
flue thermostat
20
coaxial fitting
21
automatic air vent
22
expansion vessel
23
fumes header
24
105°C overheat thermostat
25
central heating NTC sensor
26
3-way valve motor
27
three-way valve
28
hydraulic pressure switch
29
automatic bypass
30
siphon
sealed chamber