Baxi ECO 3 Instructions Manual page 24

Figure 22
Key:
1 water pressure switch
2 automatic bypass
3 gas valve
4 ignition electrode
5 central heating NTC sensor
6 overheat safety thermostat
7 flue-water exchanger
8 flue hood
9 fan
10 air pressure switch
11 positive pressure point
(Not featured on 1.140 Fi)
instructions pertaininG to the
1.240 fi
seaLeD chaMBer
heating gas
inlet
12 negative pressure point
13 flame detector electrode
14 main burner
15 burner injectors
16 expansion vessel
17 automatic air vent
18 pump and air separator
19 boiler drain point
20 manometer
21 pressure relief valve
instaLLer
24
domestic heating
water inlet return
924.674.3 - GB