8
WATER CIRCUIT
LEGEND
A
System delivery
B
Hot water outlet
C
Gas
D
Cold water inlet
E
System return
Exchanger
Modulator coil
Heating sensor
Gas valve
5
Filling cock
6
Safety valve
7
Switching valve microswitch
8
No-water pressure switch
9
Circulator
0
Burner
Expansion tank
Fumes pressure switch
Fan
Automatic air bleed valve
5
Total safety thermostat
6
Hot water sensor
7
Drain tap
8
Pressure-operated switching valve
9
Plate exchanger
0
By-pass pipe
XILO D 0 N MCS W TOP
Fume analysis points