Unit Compatibility; Water Circuit Diagram - Mitsubishi Electric ecodan ERST20 series Installationshandbuch

3
technical information

Unit Compatibility

Cylinder unit
EHPT20X-
Outdoor unit
Packaged PUHZ-W50, 85, 112
model
PUHZ-HW112, 140
Split model SUHZ-SW45
PUHZ-SW40, 50
Cylinder unit
Outdoor unit
Split model PUHZ-FRP71
PUHZ-SW75, 100, 120
PUHZ-SHW80, 112, 140
PUMY-P112, 125, 140*KM*2

Water circuit diagram

• Refer to <Table 3.2> for the part names.
*1 Refer to the following section [Local system].
<E*ST20*-*M**C > (Split model system)
30
Drain
29
28
Flare connection
<EHST20*-MHCW> (UK Split model system) <Example>
Drain
30
Drain
29
Flare connection
7
EHPT20X- EHPT20X- EHPT20X-
VM2C VM6C YM9C TM9C
— — — —
— — — —
EHST20C- EHST20C- EHST20C- EHST20C-
VM2C VM6C YM9C TM9C
31
Cold water
30
9
22
10
A
11
8
Pa
19
27
18
20
17
23
7
24
6
5
25
4
26
15 12
7 13
3
14
Cylinder unit
<Figure 3.2>
37
35
Cold water
30
9
30
10
A
Drain
11
8
21
Pa
16
19
18
17
7
24
6
5
25
4
28
26
15
3 14 13
7
Cylinder unit
<Figure 3.3>
EHPT20X- EHST20D- EHST20D- EHST20D-
MHCW VM2C MEC
— —
—
—
EHST20C- EHST20C- EHST20C-
VM2EC VM6EC YM9EC
<Table 3.4>
Refrigerant pipe
Water pipe
DHW
B
32
Local system
*1
33
32
31
Water Drain
supply
Refrigerant pipe
Water pipe
DHW
B
32
Local system
*1
27
20
33
32 32
23
Drain
Flexible hose
(Temporary connection)
12
36
EHST20D- EHST20D- ERST20D-
MHC VM2EC YM9C MEC
— — — —
EHST20C- ERST20C- ERST20C- EHST20C-
MEC MEC VM2C MHCW
— —
— — —
Note
• To enable draining of the cylinder unit an iso-
lating 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 coun-
try's regulations.
• A backflow prevention device must be in-
stalled 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 cor-
rosive reaction taking place which may dam-
age the pipework.
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 35)
and the cylinder unit (safety matter).
• 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 coun-
try's regulations.
• When using components made from different
metals or connecting pipes made of different
metals insulate the joints to prevent any corro-
sive 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 33) above
the level of the T&P relief valve (item 19). This
will ensure DHW tank will not require drain-
down to service/maintain the inlet control
group.
ERST20D- EHST20D-
VM2C MHCW
— —