Servicing
35
1.
1. Power mains 230VAC,
2. Three-way valve,
3. Pump,
4. Gas valve SIGMA 848,
5. Ignition electrode,
6. Ionization electrode,
7. Fan,
8. Flue gas sensor,
9. HSW sensor,
10. External sensor,
11. Water flow sensor,
12. Water pressure sensor,
13. Output temperature sensor,
14. Exchanger thermostat,
15. Safety thermostat,
16. Room instrument OPENTHERM
17. Room thermostat,
18. Panel with LCD screen
Fig. no. 20
Boiler electrical equipment wiring diagram
bk
black
bu
blue
bn
brown
rd
red
wh
white
vt
purple
og
orange
ye
yellow
gn
green
gnye
green-yellow