45
WATER CIRCUIT
LEGEND
A
System delivery
B
Gas
C
Cold water inlet
D
System return
1
Exchanger
2
Modulator coil
3
Heating sensor
4
Gas valve
5
Filling cock
6
Safety valve
7
No-water pressure switch
8
Circulator
9
Burner
10
Expansion tank
11
Fumes pressure switch
12
Fan
13
Automatic air bleed valve
14
Total safety thermostat
15
Flue control
16
By-Pass (if any)
XILO T 20 M W TOP
XILO T 20 MS W TOP
D
C
B
A
4
2
6
5
16
7
8
13
14
9
10
1
3
15
1009DIS1359
1009DIS1360
D
C
B
A
4
2
6
5
16
7
8
13
14
9
10
11
12
1
3
Fume analysis points