Water System Diagram - Mitsubishi Electric EHPT17X-VM6D Service Manual

8

WATER SYSTEM DIAGRAM

<E*PT17X-*M*D> (Packaged model system)
Drain
31
3
41 *b
34
34
37 36
<E*ST17/20D-*M**D> (Split model system)
36
32
Drain
29
31
28
Flare connection
<EHPT20X-MHEDW> (UK model system) <Example>
10
32
Drain
31
3
34 41*b
34
36
37
OCH714E
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33
36 Cold water
32
21
9
A
10
7
Pa
15
18
26
27
17
19
16
5
22
23
6
42
24
4
6
25
14
11
13
12
6
Cylinder unit
<Figure 8.1>
33
Cold water
32
21
8
9
A
10
7
Pa
15
18
26
27
17
19
16
5
22
23
6
42
24
4
25
11
14
3
12
13
6
Cylinder unit
<Figure 8.2>
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>
Water flow
DHW
B
34
Local system
*a
35
34
33
Water
Drain
supply
Refrigerant flow
Water flow
DHW
B
34
Local system
*a
35
34
33
Water
Drain
supply
Water flow
DHW
B
34
Local system
*a
35
34
Drain
Flexible hose
(Temporary connection)
39
Mains water supply
29
*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.
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
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 in-
stalled on the cold water supply pipework
(IEC 61770)
• When using components made from dif-
ferent metals or connecting pipes made
of different metals, insulate the joints to
prevent any corrosive reaction taking place
which may damage the pipework.)
*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.)
*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.