Baxi Nuvola 3 BS 40 Series Operating And Installation Instructions page 60

DHW DHW
outlet inlet
Figure 22
Key:
1 heating filter
2 pressure gauge
3 powered 3-way valve
4 gas valve
5 heating circuit pump with deaerator
6 boiler filling tap
7 gas train with injectors
8 flame detection electrode
9 fumes conveyor
10 air pressure switch
11 negative pressure point
12 positive pressure point
13 venturi tube
14 fan
15 water-fumes exchanger
16 flame ignition electrode
INSTRUCTIONS FOR FITTERS
140 Fi - 240 Fi - 280 Fi
heating delivery
17 burner
18 safety thermostat
19 NTC heating probe
20 NTC domestic hot water sensor
21 sacrificial anode
22 storage boiler
23 heating circuit expansion vessel
24 DHW circuit pump
25 storage boiler drain tap
26 DHW circuit safety valve
27 DHW circuit expansion vessel (accessory)
28 boiler safety valve
29 boiler drain tap
30 hydraulic pressure switch
31 check valve on automatic by-pass
32 plate exchanger
60
heating return gas inlet
7113868.01 - en