Water System Diagram - Mitsubishi Electric EHST17D-YM9D 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
Drain
31
Flare connection
OCH714B
33
Cold water
36
32
21
9
A
10
7
Pa
15
18
26
27
17
19
16
5
22
23
6
42
24
4
6
14 25
11
13
12
6
Cylinder unit
<Figure 8.1>
33
Cold water
32
21
32
8
9
A
10
7
Pa
15
18
26
27
17
19
16
5
22
23
6
42
24
29
4
28
25
11
14
3
12
13
6
Cylinder unit
<Figure 8.2>
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
25
*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.)