30
OCH714D
<Figure 8.5>
9
31
8*d
32
34
B
33
A
33
34
35
10
4
24
7
27
6
11
25
18
5
14
12
15
22
19
13
6
23
17
16
32
21
8*c
26
3
28
36
29
42
Pa
<E*ST20C/30C/30D-*M**D> (Split model system)
Drain
Drain
Cylinder unit
Cold water
DHW
Local system
*a
Water
supply
Water flow
Refrigerant flow
Drain
Flare connection
Notes
• To enable draining of the cylinder unit, an
isolating valve should be positioned on both
the inlet and outlet pipework.
• Be sure to install a strainer on the inlet pipe-
work 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 in
-
stalled on the cold water supply pipework
(IEC 61770)
• When using components made from differ-
ent metals or connecting pipes made of dif-
ferent metals, insulate the joints to prevent
any corrosive reaction taking place which
may damage the pipework.
Go to the Mitsubishi website to check the compo
-
nent parts of each unit.
*a. Refer to the following section [Local system].
*c, d. Refer to the component parts table of the
Mitsubishi website.
3
9
31
34
34
36
36
34
B
33
A
33
34
35
10
4
24
7
27
6
11
25
18
5
14
12
15
22
19
13
6
23
17
16
6
32
21
26
41 *b
42
37
Pa
<Figure 8.4>
<E*PT20/30X-*M**D> (Packaged model system)
Drain
Drain
Cylinder unit
Cold water
DHW
Local system
*a
Water flow
Water
supply
Notes
• To enable draining of the cylinder unit, an
isolating valve should be positioned on both
the inlet and outlet pipework.
• Be sure to install a strainer on the inlet pipe-
work 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 in
-
stalled on the cold water supply pipework
(IEC 61770)
• When using components made from differ-
ent metals or connecting pipes made of dif-
ferent metals, insulate the joints to prevent
any corrosive reaction taking place which
may damage the pipework.
Go to the Mitsubishi website to check the compo
-
nent parts of each unit.
*a. Refer to the following section [Local system].
*b. If the outdoor unit is higher than the indoor
unit, or if there is a location where air gets
trapped in the upper part of the water pipe,
consider adding this part.
31
Pa
11
25
13
14
6
3
28
29
17
18
6
23
22
27
26
15
5
24
7
36
36
10
21
8
16
43
44
45
46
47
9
42
48
49
50
51
33
34
34
34
34
33
34
34
34
34
52
52
<ERST17D-***BD> (Split model 2-zone system)
Drain
Drain
2-zone cylinder
Cold water
DHW
Local system
(Radiator)
Local system
(Floor heating)
Water
supply
Water flow
Refrigerant flow
Drain
Flare connection
Drain
Water
supply
<Figure 8.6>
