Water System Diagram - Mitsubishi Electric EHST20C-VM2C.UK Service Manual

8

WATER SYSTEM DIAGRAM

• Refer to <Table 4-1> for the part names.
*1 Refer to the following section [Local system].
<EHST20*-*M**C > (Split model system)
30
Drain
29
Flare connection
<EHST20*-MHCW> (UK Split model system) <Example>
Drain
30
Drain
29
Flare connection
OCH570
31
Cold water
30
9 22
10
A
11
8
Pa
19
27
18
20
17
23
7
24
6
5
25
4
28
26
7 15 13 12
3
14
Cylinder unit
<Figure 8-1>
35
Cold water
30
9
10 30
A
Drain
11
8
21
Pa
16
19
18
17
7
24
6
5
25
4
28
26
15
3 14 13
7
Cylinder unit
<Figure 8-2>
Refrigerant pipe
Water pipe
DHW
B
32
Local system
*1
33
32
31
Water Drain
supply
Refrigerant pipe
Water pipe
37
DHW
B
32
Local system
27
20
33
32 32
23
Drain
Flexible hose
(Temporary connection)
12
36
21
Note
• To enable draining of the cylinder unit
an isolating valve should be posi-
tioned on both the inlet and outlet
pipework.
• Be sure to install a strainer on the inlet
pipework to the cylinder unit.
• Suitable drain pipework should be at-
tached to all relief valves in accord-
ance 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 reac-
tion taking place which may damage
the pipework.
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
expansion valve (item 35) and the cyl-
inder unit (safety matter).
• Be sure to install a strainer on the inlet
pipework to the cylinder unit.
• Suitable drain pipework should be at-
tached to all relief valves in accord-
ance with your country's regulations.
*1
• When using components made from
different metals or connecting pipes
made of different metals insulate the
joints to prevent any corrosive reac-
tion taking place which may damage
any pipework.
• Filling loop's flexible hose must be re-
moved following the filling procedure.
Item provided with unit as loose ac-
cessory.
• Install the inlet control group (item 33)
above the level of the T&P relief valve
(item 19). This will ensure DHW tank
will not require drain-down to service/
maintain the inlet control group.