Water System Diagram - Mitsubishi Electric EHST20C-VM6HB Service Manual

8

WATER SYSTEM DIAGRAM

<EHST0C-*M*HB/ *M*B> (Split model system)
10
26
Drain
25
24
1
Flare connections
<EHST0C-VM6SB> (Solar split model system)
32
33
26
Drain
25
24
1
Flare connections
OCH531
37
29
Cold water
9
Pa
26
11
Drain
28
12
13
23
15
16
14
8 7
M
6
2 21
4
5
3
22
19
18
20
Cylinder unit
33
37
Cold
29
water
9
10
Pa
26
11
Drain
28
12
13
23
14
7
8
M
6
2 21
4
5
3
22
19
20 18
Cylinder unit
A
B
DHW
27
30
Local system
*1
31
30
29
Water
Drain
supply
A
B
DHW
27
30
Local system
*1
31
30
29
Water
Drain
supply
8
Refrigerant pipe
A.
B. Water pipe
Plate heat exchanger
1.
Flexible hose
.
. Booster heater 1,
4. Drain cock (booster heater)
5. Pump valve
6. Water circulation pump 1
3-way valve
7.
8. Manual air vent
9. Manometer
10. Pressure relief valve ( bar)
11. Automatic air vent
1. Expansion vessel (except EHST20C-*M*EB)
1. DHW tank
14. Drain cock (DHW tank)
15. Flexible hose
16. Immersion heater (only for EH*T0*-*M*HB)
18. Strainer valve
19. Flow switch
0. Drain cock (primary circuit)
1. THW1
. THW
. THW5
4. TH
5. Outdoor unit
6. Drain pipe (field supply)
7. Cold water inlet pipe
8. DHW outlet connection
9. Back flow prevention device (field supply)
0. Isolating valve (field supply)
1. Magnetic filter (field supply) (recommended)
. Solar panel (field supply)
. Solar hydraulic kit (kit to be compatible for use
with FTC 4 (field supply)
7. Pressure relief valve (10 bar) (accessory)
*1 Refer to page 31.
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 7) 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.