Filling - DeDietrich GT 400 A Assembly And Installation Instructions Manual

3 Filling

The boiler may be filled using the drain tap or water make-up system.
Filling should be done at a slow flow rate in order to purge all the air
contained in the system through air vents installed at the system high
points. Filling is always done with circulating pumps stopped.
4 Typical Boiler Piping Layout
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, com-
ply with applicable codes of practice and national or
local regulations.
Example of a GT 400 boiler with domestic hot water
production via one or more independent calorifiers.
11
27
1. Heating flow
2. Heating return
3. Safety relief valve and pressure gauge
4. Flow switch
5. Air separator
6. Automatic venting valve
7. Valve
8. Recycling pump
9. Expansion vessel
10. Draining valve
11. Sludge removal valve
12. Mixing valve
13. Non return valve
14. Heating pump
15. Low-water cutoff safety device [as required by code]
28
3
6
4
5
7
7
8
7
7
9
10
7
13
22
26 25 7
7
10
A pressure relief valve is required, the relief valve must be rated for the same capacity
as the appliance. The relief must be a certified type by ASME/CSA B51. The relief must
be piped to discharge hot water to the nearest drain, they will avoid personal injury or
property damage. The relief must be installed in accordance to local and national codes
having jurisdiction.
Hot water boiler above the radiation level or as required by authority having jurisdiction,
must be equipped with a low water cutoff device.
Suitable protection to avoid indigestion of water shall be provided to the boiler controls
and burners.
12 7
7
13 14
7
21
24
6 7
23
13
7
17
19
7
20
18
16. Sludge decanting pot
(particularly recommended for older heating systems)
17. Independent calorifier
18. Temperature & pressure relief device
19. Pressure reducer
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 circuitfilling (with disconnector if required
under applicable regulations).
GT 400 A
1
Heating
Circuit
chauffage
Circuit
15
16
2
7
10
21/09/06 - 94863449 - 82294154E
8219N008 B