Mitsubishi Electric ecodan EHST20D-VM2C2 Installation Manual page 7

3
Technical Information
Unit Compatibility
Cylinder unit
Outdoor unit
Packaged model
PUHZ-W50, 85
Split model SUHZ-SW45
PUHZ-SW40, 50, 75
(See below.)
• When connecting E*ST20D-VM2C2 to PUHZ-SW75, the following refrigerant joint pipes are necessary.
PAC-SG74RJ-E (ø12.7 → ø15.88 for gas refrigerant pipe)
PAC-SG72RJ-E (ø6.35 → ø9.52 for liquid refrigerant pipe)
Water circuit diagram
• Refer to <Table 3.2> for the part names.
*1 Refer to the following section [Local system].
<EHST20D-VM2C2> (Split model system)
<ERST20D-VM2C2>
30
Drain
29
Flare connection
<EHPT20X-VM2C2> (Packaged model system)
30
Drain
29
3
32
32
34
EHPT20X-VM2C2 EHST20D-VM2C2
—
—
—
<Table 3.4>
31
Cold water
30
9
22
10
A
11
8
Pa
16
19
27
18
20
17
23
7
24
6
5
25
4
28
26
15 12
7 13
3
14
Cylinder unit
<Figure 3.2>
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 3.3>
ERST20D-VM2C2
—
Refrigerant pipe
Water pipe
DHW
B
32
Local system
*1
33
32
31
Water Drain
supply
Water pipe
DHW
B
32
Local system
*1
27
33
20
32
31
23
Water Drain
supply
12
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.
• 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.)
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