Hydraulic Connections; Important Recommendations On Connecting The Heating Circuit To The Boiler And The Drinking Water System - REMEHA P 420 Technical Instructions

1 Important recommendations on connecting the heating circuit to the boiler and the drinking water system

Installation must be carried out in accordance with the prevailing
regulations, the codes of practice and the recommendations in these
instructions.
The expansion tank must be connected directly to the boiler without
valves or stop valves.
13
18
1. Heating outlet
2. Heating return
3. 3 bar safety valve + manometer
5. Flow switch
6. Air separator
7. Automatic bleed valve
9. Isolation valve
10. 3-way mixing valve
11. Boiler pump
12. Sludge decanting pot (particularly recommended on older
installations)
13. Flush valve
14. Water low safety pressure-sensitive switch
15. Recycling pump
16. Expansion chamber
17. Drain cock
18. Heating circuit filling (with disconnector depending on prevailing
regulations)
19. Water treatment if TH > 25°
20. Water meter
26. DHW load pump
27. Non-return valve
28. Domestic cold water inlet
29. Pressure reducer (if mains pressure 5.5 bar)
30. Sealed safety unit calibrated to 7 bar with indicator type discharge
31. Independent domestic hot water tanks
06/04/06 - 300008441-001-C

Hydraulic connections

3
7
6
5
9
9
15
9
9
16
17
9
27
26
19 20 9
9
17
Likewise, the safety valve must be connected directly to the boiler
without valves or stop valves.
Example of an installation:
The example of an installation shown below does not cover every
possible configuration.
10 9
9
11
9 27
57
56
7 9
32
27
9
31
29
9
28
30
32. Domestic hot water loop pump (optional)
56. Domestic hot water circulation return loop
57. Domestic hot water outlet
Remeha P 420
1
14
12
2
9
17
8219N008C
9