46
LEGEND
1
Air bleed valve
2
Control electrode
3
Fan
4
Ignition electrodes
5
Control box
6
Ignition transformer
7
Fume pressure switch
8
NTC 2 return sensor
9
NTC 3 hot water sensor
10
Water trap for condensate discharge
11
Circulating pump
12
Lack of water pressure switch
13
Filling cock
14
Hydrometer
15
NTC 1 delivery sensor
16
Expansion tank
17
3-way valve
18
Water-heater
19
Gas valve
20
Aluminium boiler body
A
3/4” Ø system delivery
B
1/2” Ø hot water outlet
C
3/4” Ø gas inlet
D
1/2” Ø cold water inlet
E
3/4” Ø system return
MAIN COMPONENTS
1
2
15
4
16
6
3
7
20
8
10
1
12
11
13
14
6
5
A
B C
D E
19
18
9
17