Baxi Fourtech Series Operating And Installation Instructions page 61

Figure 19
Legend:
1 Pump and air separator
2 Pressure gauge
3 Heating circuit extractable filter
4 Boiler filling tap
5 Check valve on automatic by-pass
6 Water pressure switch
7 Boiler drain tap
8 Safety valve
9 Gas valve
10 Gas train with injectors
11 Central heating NTC sensor
INSTRUCTIONS FOR FITTERS
1.24 F - 1.14 F
Heating
Gas
delivery
12 Ignition / flame detection electrode
13 Safety thermostat
14 Water-fumes exchanger
15 Fumes conveyor
16 Fan
17 Venturi tube
18 Positive pressure point
19 Negative pressure point
20 Air pressure switch
21 Burner
22 Expansion vessel
61
Heating
DHW
return
inlet
926.116.5 - en