GT/GTM/GTG 300/II GT/GTM/GTG/GTI 300 K/II GT/GTM 300 ...

4. HYDRAULIC CONNECTIONS
4.1 Important recommendations for connecting the heating circuit to the boiler and
to the drinking water system
The installation shall be made in accordance with
applicable regulations and codes of practice.
The expansion tank shall be connected to the boiler
without any valve or stop valve between the boiler and
the expansion tank.
Similarly, the safety valve shall be connected
to the boiler without any valve or stop valve
between the boiler and the safety valve.
Example of installation :
The example below does not cover all the possible cases of
use. It is only aimed at drawing attention to the basic rules
which must be complied with. In all events, comply with applicable
codes of practice and national or local regulations.
Example of a GT 300/II boiler with domestic hot water
production via one or more independent calorifiers.
11
27
3
10
4 5
7 26 25 7
8
7
7
7
13
1. Heating outlet
2. Heating return
3. 3 bar safety valve and pressure gauge
4. Flow switch (if necessary)
5. Air separator
6. Automatic venting valve
7. Valve
8. Recycling pump (recommended for GT 304/II,
compulsory for GT 305/II to 309/II)
9. Expansion tank
10. Draining valve
11. Sludge removal valve
12. Mixing valve
13. Non return valve
14. Heating pump
15. Low-water safety pressure-sensitive switch
9
7
6
7
22
10
7
6 7
9
21
The heating system shall be designed and installed in
a way as to prevent the water from the heating circuit
and any substances added to it from flowing back into
the drinking water circuit located before it. The installation
shall not be directly connected to the drinking
water system.
12 7
1
17
7
24
13
23
13
7
19
7
14
20
15
10
16
7
2
Heating
circuit
8219N008A
18
16. Sludge decanting pot (particularly recommended for
older heating systems)
17. Independent calorifier
18. Sealed safety unit calibrated to 7 bar with indicator
type discharger
19. Pressure reducer (if mains pressure > 5.5 bar)
20. Domestic cold water inlet
21. Domestic hot water outlet
22. Load pump
23. Domestic hot water circulation pump (optional)
24. DHW circulation loop return
25. Water meter (if any)
26. Water treatment if TH > 25°
27. Heating circuit filling (with disconnector if required
under applicable regulations).