Mitsubishi Electric ecodan EHPT20Q-VM2EA Installation Manual page 5

3
Technical Information
Water circuit diagram
*1 Refer to the following section [Local system].
<EHPT20Q-VM2EA>
*: Locally supplied
Water pipe
10 11
30*
30*
35*
31* 31*
27
Pa
12
9
To drain To drain
21
15
26
19
3
2
20
HEX
32*
5
6
32*
Outdoor Unit
QUHZ-W40VA EHPT20Q-VM2EA
1. Plate heat exchanger 12. Manual air vent
2. Booster heater with thermostat 13. Drain valve (Primary circuit)
3. Drain cock (Primary circuit) 14. Strainer valve
4. Drain cock (Secondary (Potable) circuit) 15. Flow sensor 1 (For space heating)
5. Pump valve 16. Flow sensor A (Secondary (Potable) circuit)
6. Water circulation pump 1 17. Flow sensor B (Primary circuit)
(For thermal store and space heating) 18. Primary thermal store tank
7. Water circulation pump A 19. THW1 (Flow water temp. thermistor)
(For hot water supply to plate heat exchanger) 20. THW2 (Return water temp. thermistor)
8. 3-way valve 21. THW3 (Flow water temp. thermistor 2 (to tank))
9. Manometer 22. THW4 (DHW supply temp. thermistor)
10. Primary pressure relief valve 23. THW5A (Stored water temp. thermistor (upper))
11. Automatic air vent 24. THW5B (Stored water temp. thermistor (lower))
<Case of DHW only use>
29* Outlet (DHW)
33*
Flexible hose
(Temporary connection)
Cylinder Unit
EHPT20Q-VM2EA
Mains Water supply
<Figure 3.3>
8
10
Outlet (DHW)
33*
25 25
34*
22
17 16
29*
Inlet
1
(Mains water supply)
18
32*
23
Local system*1
3 4
27
32*
24
32*
12
To drain
7
8
3
28*
Flexible hose
13
(Temporary connection)
5
14
Mains Water supply
Cylinder Unit
25. Electrical isolation pipe
26. Manual thermostat
27. Non-return valve
28. Filling loop (Accessory item)
29. Primary expansion vessel (Accessory item)
30. Discharge pipe (Local supply)
31. Tundish (Accessory item)
32. Isolating valve (Local supply)
33. Thermo mix valve (recommended) (Local supply)
34. Magnetic fi lter (recommended) (Local supply)
35. Strainer (Local supply)
<Figure 3.2>
28*
3
Technical Information
Note:
• To enable draining of the cylinder unit, an isolating valve should be positioned on both the inlet
and outlet pipework.
• Within the building, be sure to install a maintainable strainer (Item 35) on the inlet pipework
to the cylinder unit. Similarly, on the return pipework from space heating circuit, it is also
recommended to install a maintainable magnetic fi lter (Item 34).
• Suitable drain pipework should be attached to all pressure relief valves in accordance with
national regulations.
• 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.
• Filling loop΄s fl exible hose must be removed following the fi lling procedure. Item provided with
unit as loose accessory.
• Install primary expansion vessel to the return circuit of space heating and ensure clear water
passage between cylinder unit and primary expansion vessel.
Model name
Maximum secondary (potable) water supply pressure
Primary expansion vessel charge pressure
Primary pressure relief valves set pressure (2 No. devices)
Booster heater specifi cation
Primary thermal store capacity (Tank capacity)
Mass of the unit when full
Maximum primary working pressure
Minimum primary working pressure
Note:
Maximum primary water supply pressure is 10 bar (1 MPa).
At commissioning stage, please adjust water pressure within primary circuit to 1 bar (100 kPa).
EHPT20Q-VM2EA
10 bar (1 MPa)
1.0 bar (100 kPa)
3.0 bar (300 kPa)
2 kW, 230 V
200 L
283 kg
2.5 bar (250 kPa)
1.0 bar (100 kPa)
<Table 3.4>
9