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3
Technical Information
Water circuit diagram
<EHPT20X-MEHEW> (UK model system) <Example>
Note:
Do not attach an
additional pressure
relief valve below 5
bar to the heating
(cooling) circuit on
E*PT**X model to
keep fire safety.
Drain
en
31
37
3
34
41*b
34
36
7
10
Cold water
33(ICG)
36
A
Drain
9
7
Pa
20
32
15
18
17
16
5
23
6
24
6
14
25
11
6
13
12
Cylinder unit
<Figure 3.2>
40
DHW
B
34
Local system
*a
26
27
35
19
34
33
22
Water
Drain
supply
Water flow
Go to the Mitsubishi Electric website to check the
water circuit of other units and the component
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.
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 strainers on the inlet and
outlet pipework (item 36) to the cylinder
unit.
• Suitable drain pipework should be attached
to the relief valves instructed to be con-
nected to it in Figures 3.2 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.
• Be sure to install a magnetic filter (item 35)
on the space heating return to the cylinder
unit.
• For UK model, be sure to appropriately in-
stall primary expansion vessel item 10 (Lo-
cal supply).
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