92
71.03982.03 - EN
INSTALLATION INSTRUCTIONS
33. FUNCTIONAL CIRCUIT DIAGRAM
24 MI FF
Key:
1
Pump and air separator
2
No-return valve
3
Three-way valve
4
Three-way valve motor
5
Pressure gauge
6
Heating circuit extractable filter
7
Disconnector
8
Boiler filling tap
9
Cold water extractable filter
10
DHW priority sensor
11
NTC domestic hot water sensor
12
Check valve on automatic by-pass
13
Water pressure switch
14
Boiler drain tap
15
Safety valve
16
Water-water plate heat exchanger
17
Gas valve with gas diaphragm
18
Gas train with nozzles
19
Central heating NTC sensor
20
Ignition/flame detection electrode
21
Safety thermostat
22
Water-fumes exchanger
23
Fumes conveyor
24
Fan
25
Venturi tube
26
Positive pressure point
27
Negative pressure point
28
Air pressure switch
29
Burner
30
Expansion vessel
Figure 17
Heating flow
DHW
outlet
Gas
DHW
inlet
Heating return
CG_2269 / 1006_1805