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3
Technical Information
Circuit diagram
• Refer to <Table 3.2> for the part names.
31
en
30
Ambient
24
42
21 35
Ambient loop
(a)
Local
system 2*
(b)
Note
• To enable draining of water circuit an isolating valve should be positioned on both the inlet and outlet pipework. No valve
should be fitted between the expansion valve (part of item 46) and the heat pump unit (safety matter).
• For space heating (primary) circuit a suitable expansion vessel MUST be supplied and fitted by installer. (See figure 4.3.2) Be
sure to install a magnetic filter (item 34) on the inlet pipework to the heat pump unit.
• Suitable drain pipework should be attached to the relief valves instructed to be connected to it in Figure 3.2 in accordance with
your country's regulations.
• When using components made from different metals or connecting pipes made of different metals insulate the joints to prevent
any corrosive reaction taking place which may damage the pipework. Filling loop's flexible hose must be removed following the
filling procedure. This flexible hose (Item 52) is included in PAC-WK02-E.
• Install the inlet control group (item 46) above the level of the T&P relief valve (item 22).
This will ensure DHW tank will not require drain down to service/maintain the inlet control group.
Model name
Maximum supply pressure to the pressure reducing valve
Operating pressure (Sanitary side)
Expansion vessel charge setting pressure (Sanitary side)
Expansion valve setting pressure (Sanitary side)
Immersion heater specification (Sanitary side) *
DHW tank capacity
Mass of the unit when full
Maximum primary working pressure
Maximum sanitary-side working pressure
Maximum ambient loop working pressure
11
46
Cold water
31
Drain
10
8
Pa
19
22
18
17
6
51
Water circuit
(Primary/Sanitary)
5
25
12
26
39
54
4
48
36
36
44
Refrigerant circuit
47
40
49
45
DHW
32
9
11
27
16
28
20
23
Heat
sink
43
14
7
15
13
53
37 39
41
50
3
29
38
* Refer to the following section [Local system].
<Figure 3.2>
EHWT17D-MHEDW
16 bar
3.5 bar
3.5 bar
6.0 bar
3000 W, 230 V
170 L
345 kg
2.5 bar
5.5 bar
9.5 bar
33
Local
system 1*
34
33
Drain
Flexible hose
(Temporary connection)
52
Mains water supply
* EN60335/Type 3000W single phase
230V 50Hz, length 460 mm.
Use only Mitsubishi Electric service
parts as a direct replacement.
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