13
2.3 Hydraulic layouts
Pic. 5 – Hydraulic layout CTN model
Pic. 6 – Hydraulic layout CTFS model
1. DHW temperature probe
2. Modulating gas valve
3. CH temperature probe
4. Burner nozzles
5. Burner
6. Ignition/flame sensing electrode
7. Safety thermostat
8. Bi-thermal heat exchanger
9. Flue gas hood
10. Flue gas thermostat
11. Expansion vessel
12. Air purging device
13. Pump
14. Water pressure switch
15. 3 bar safety valve
16. Loading tap
17. DHW flow limiting device – 10 liter per
minute
18. Domestic cold water flow switch
19. Domestic cold water inlet filter
M CH flow
C DHW flow
G Gas intake
F Water mains inlet
R CH return
1. DHW temperature probe
2. Modulating gas valve
3. CH temperature probe
4. Burner nozzles
5. Burner
6. Ignition/flame sensing electrode
7. Safety thermostat
8. Bi-thermal heat exchanger
9. Sealed combustion chamber
10. Flue gas discharge fan
11. Flue gas check
12. Air/flue gas safety pressure switch
13. Air/flue gas coaxial ducts
14. Air check
15. Air purging device
16. Domestic cold water inlet filter
17. Expansion vessel
18. Pump
19. Loading tap
20. Water pressure switch
21. 3 bar safety valve
22. DHW flow limiting device – 10 liter per
minute
23. Domestic cold water inlet flow switch
M CH flow
C DHW flow
G Gas intake
F Water mains inlet
R CH return
