Mitsubishi Electric ecodan EHST20 Série Manuel D'installation page 10

3
technical information
<eHPt20X-*M*HB/*M*B (except eHPt20X-VM2HB)>
(Packaged model system)
26
34
Drain
25
1
30
30
34
9
37
29
Cold water
9
10
Pa
27
26
11
Drain
28
12
13
23
15
16
14
7
8
M
6
21
4
5
3
22
19
18
20
Cylinder unit
<Figure 3.8>
B
DHW
30
Local system
*1
31
30
29
Water
Drain
supply
B. Water pipe
1. Plate heat exchanger
3. Booster heater 1,2
4. Drain cock for booster heater)
5. Pump valve
6. Water circulation pump 1
7. 3-way valve
8. Manual air vent
9. Manometer
10. Pressure relief valve (3 bar)
11. Automatic air vent
12. Expansion vessel
13. DHW tank
14. Drain cock for DHW tank
15. Flexible hose
16. Immersion heater (only for EH*T20*-*M*HB)
18. Strainer valve
19. Flow switch
20. Drain cock for primary circuit
21. THW1
22. THW2
23. THW5
25. Outdoor unit
26. Drain pipe (field supply)
27. Cold water inlet pipe
28. DHW outlet connection
29. Back flow prevention device (field supply)
30. Isolating valve (field supply)
31. Magnetic filter (field supply) (recommended)
34. Strainer (field supply)
37. Pressure relief valve (10 bar) (accessory)
*1 Refer to Page 10.
Note
• To enable draining of the cylinder unit an
isolating valve should be positioned on both
the inlet and outlet pipework. No valve should
be fitted between the pressure relief valve
(item 37) and the cylinder unit (safety matter).
• Be sure to install a strainer, on the inlet
pipework to the cylinder unit.
• Suitable drain pipework should be attached
to all relief valves in accordance with your
country's regulations.
• A backflow prevention device must be
installed on the cold water supply pipework
(IEC 61770)
• When using components made from different
metals or connecting pipes made of different
metals insulate the joints to prevent any
corrosive reaction taking place which may
damage the pipework.)