94
71.03982.03 - EN
INSTALLATION INSTRUCTIONS
24 FF
Key:
1
Automatic by-pass with check valve
2
Hydraulic pressure switch
3
Three-way valve
4
Three-way valve motor
5
Gas valve with gas diaphragm
6
Gas train with nozzles
7
NTC heating sensor
8
Ignition/flame detection electrode
9
Safety thermostat
10
Water-fumes exchanger
11
Fumes conveyor
12
Fan
13
Venturi tube
14
Positive pressure tap
15
Negative pressure tap
16
Air pressure switch
17
Burner
18
Expansion vessel
19
Pump and air separator
20
Non-return valve
21
Boiler drain tap
22
Pressure gauge
23
Safety valve
24
Disconnector
Figure 19
Heating flow
Gas
DHW
inlet
Heating return
CG_2267 / 1006_2102
Storage
boiler
flow