Mitsubishi Electric EHST17D-VM2D Service Manual page 24

<EHPT20X-MHEDW> (UK model system) <Example>
10
32
Drain
31
3
34
34
36
<E*PT20/30X-*M**D> (Packaged model system)
Drain
31
3
34
34
36
<E*ST20C/30C/30D-*M**D> (Split model system)
36
32
Drain
31
Flare connection
OCH714A
40
38
Cold water
36
A
32
9
Drain
7
20
Pa
15
18
26
27
17
16
19
5
22
23
6
24
6
25
14
11
13 12
6
Cylinder unit
<Figure 8.3>
33
Cold water
36
32
A
21
9
7 10
Pa
15
18
26
27
17
19
16
5
22
23
6
24
4
6
14 25
11
13 12
6
Cylinder unit
<Figure 8.4>
33
Cold water
A
8*c
32
21
9
Drain
7
10
Pa
15
18
26
27
17
19
16
5
22
23
6
24
29
4
28
14 25
11
3
13 12
6
Cylinder unit
<Figure 8.5>
Water flow
DHW
B
34
Local system
*a
35
34
Drain
Flexible hose
(Temporary connection)
39
Mains water supply
Water flow
DHW
B
34
Local system
*a
35
34
33
Water
Drain
supply
Refrigerant flow
Water flow
DHW
B
8*b
34
Local system
*a
35
34
33
Water
Drain
supply
24
*a. Refer to the following section 'Local sys-
tem' on the 'Paper-based manual'.
Note
• To enable draining of the cylinder unit, an iso-
lating valve should be positioned on both the
inlet and outlet pipework. No valve should be
fitted between the expansion valve (item 38)
and the cylinder unit (safety matter).
• For space heating (primary) circuit a suit-
able expansion vessel MUST be supplied
and fitted by installer.
• 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.
• 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 any pipework.
• Filling loop's flexible hose must be removed
following the filling procedure. Item provided
with unit as loose accessory.
• Install the inlet control group (item 38)
above the level of the T&P relief valve (item
20). This will ensure DHW tank will not
require drain down to service/maintain the
inlet control group.
Go to the Mitsubishi website to check the compo-
nent parts of each unit.
*a. Refer to the following section [Local system].
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,c. Refer to the component parts table of the
Mitsubishi website.
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.