User manual

Installation Manual
Wall Hung Condensing Boiler – Cod. 99921NA – June 2002
11
MAIN COMPONENTS
mod.
RK 25
mod.
RKR 25
only heating heating + domestic hot water
7
13
15
14
12
11
9
10
8
21
25
23
24
22
20
19
2
6
4
5
3
1
18
17
16
9
12
14
15
11
10
24
23
19
2
7
8
4
6
5
3
1
18
17
16
LEGEND
1. HEATING SENSOR
2. CONDENSING EXCHANGER
3. HEATING SAFETY THERMOSTAT
4. IGNITION ELECTRODE
5. FRAME
6. FLAME IONISATION ELECTRODE
7. FAN
8. MIXING GROUP
9. ELECTRONIC IGNITION BOARD
10. ELECTRONIC GAS VALVE VK4105 A 1001
11. AUTOMATIC AIR VENT
12. 3-SPEED CIRCULATION PUMP WITH AIR VENT
13. WATER PRESSURE SWITCH
14. HEATING CIRCUIT 3 bar PRESSURE RELIEF VALVE
15. DRAINING TAP
16. FLUE EXHAUST DUCT
17. EXPANSION VESSEL
18. AIR COMBUSTION INTAKE PIPE
19. WATER TRAP SIPHON
20. ELECTRONIC FLOWSWITCH
21. FLAT PLATE TYPE EXCHANGER
22. 3-WAY DIVERTER VALVE
23. WATER PRESSURE GAUGE
24. FILLING TAP
25. HOT WATER SENSOR