Mitsubishi EHST20C-VM2C Service Manual page 39

• Refer to <Table 4-1 and 4-2> for the part names.
*1 Refer to the following section [Local system].
<EHPT20X-MHCW> (UK Packaged model system) <Example>
Drain
Drain
29
3
32
34 32
Model name
Maximum supply pressure to the pressure reducing valve
Operating pressure (Potable side)
Expansion vessel charge setting pressure (Potable side)
Expansion valve setting pressure (Potable side)
Immersion heater specification (Potable side) *
DHW tank capacity
Mass of the unit when full
Maximum primary working pressure
* E N60335/Type 3000W single phase 230V 50Hz, length 460 mm.
Use only Mitsubishi Electric service parts as a direct replacement.
<EHPT20X-*M*C> (Packaged model system)
30
Drain
29
3
32
32
34
OCH570C
35
Cold water
34
30
9
30
10
A
Drain
11
8
Pa 21
30 16
19
18
17
7
24
6
5
25
4
7
26
15
13
7 14
Cylinder unit
<Figure 8-3>
31
Cold water
34
30
22
9 10
A
11
8
Pa
16
19
18
17
7
24
6
5
25
4
7
26
15
14
13
7
Cylinder unit
<Figure 8-4>
Water pipe
37
DHW
B
32
Local system
*1
33
27
32
20
Drain
23
Flexible hose
(Temporary connection)
36
Main water supply
12
EHPT20X-MHCW EHST20C-MHCW
16 bar
3.5 bar
3.5 bar
6.0 bar
3000 W, 230 V 3000 W, 230 V
200 L
307 kg
2.5 bar
<Table 8-1>
Water pipe
DHW
B
32
Local system
27
33
20
32
31
23
Water Drain
supply
12
39
Notes:
• To enable draining of the cylinder unit an
isolating valve should be positioned on
both the inlet and outlet pipework. No
valve should be fitted between the ex-
pansion valve (item 35) and the cylinder
unit (safety matter).
• Be sure to install a strainer on the inlet
pipework to the cylinder unit.
• Suitable drain pipework should be at-
tached to all relief valves in accordance
with your country's regulations.
• 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 any pipework.
• Filling loop's flexible hose must be re-
moved following the filling procedure.
Item provided with unit as loose acces-
sory.
• Install the inlet control group (item 35)
above the level of the T&P relief valve
(item 21). This will ensure DHW tank
will not require drain-down to service/
maintain the inlet control group.
EHST20D-MHCW
16 bar 16 bar
3.5 bar 3.5 bar
3.5 bar 3.5 bar
6.0 bar 6.0 bar
3000 W, 230 V
200 L 200 L
320 kg 312 kg
2.5 bar 2.5 bar
Notes:
• To enable draining of the cylinder
unit an isolating valve should be po-
sitioned on both the inlet and outlet
*1
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 accord-
ance with your country's regulations.
• A backflow prevention device must
be installed on the cold water supply
pipework (IEC 61770)
• When using components made from
different metals or connecting pipes
made of different metals insulate the
joints to prevent any corrosive reac-
tion taking place which may damage
the pipework.)