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17
AST 14 C 258/00
KRB
1. Condensate drain trap
17. Fan control sensor
2. Modulating gas valve
18. De-aerator
3. Heating temperature sensor 1
19. Circulating pump
4. Heating temperature sensor 2
20. 3-bar safety valve
5. Modulating fan
21. Discharge tap
6. Return temperature sensor
22. Low pressure switch
7. Primary condensing exchanger
23. Automatic bypass
9. De-aerator
24. Motorised 3-way valve
10. Combustion air intake system
11. Flue gas vent system
S
Condensate
drain
12. Flue gas sampling points
G
Gas
inlet
13. Flue gas thermostat on vent duct
M
Heating system flow
14. Flue gas probe on heat exchanger
MB
DHW tank heater flow
15. Ignition/detection electrode
RB
DHW tank heater return
16. Expansion vessel
R
Heating system return
