Countermeasure For R410A Refrigerant Leakage - Hitachi UTOPIA R32 Series Technical Catalogue
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- Installation & operation manual (51 pages) ,
- Installation & operation manual (50 pages) ,
- Installation & operation manual (50 pages)
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9 Piping work and refrigerant charge
Caution in case of refrigerant leakage
Installation restrictions for indoor units using R32 refrigerant
A
(m
2
)
min
120
100
80
60
40
20
0
1.5
2
2.5
Floor mounted
Minimum floor area for equipment installed inside
A
(m
)
2
min
m
(kg)
c
Floor mounted
1.84
28.81
1.9
30.72
2.0
34.04
2.1
37.53
2.2
41.19
2.3
45.02
2.4
49.02
2.5
53.19
2.6
57.53
2.7
62.04
2.8
66.72
2.9
71.58
3.0
76.6
3.1
81.79
3.2
87.15
3.3
92.68
3.4
98.39
3.5
104.26
4.0
136.17
4.5
172.34
5.0
212.77
6.0
306.39
7.0
417.03
8.0
544.69
9.0
689.38
10.0
851.08
9.5.3 Countermeasure for R410A refrigerant leakage
The room should have the following characteristics in case of a leak of refrigerant:
1 Opening without shutter to permit the circulation of fresh air in the room.
2 Opening without door measuring 0.15%, or greater, of the floor surface.
3 There must be a ventilator fan connected to a gas leak detector, with a ventilator capacity of 0.92 m3/min or greater.
!
D A N G E R
Special attention should be given to areas where the refrigerant may be deposited and stay in the room, such as basements or
similar, as it is heavier than air.
95
TCGB0136 rev.1 - 05/2021
m
3
3.5
Wall mounted
Ceiling mounted
A
(m
)
A
(m
)
2
2
min
min
Wall mounted Ceiling mounted
3.20
2.14
3.41
2.29
3.78
2.53
4.17
2.79
4.58
3.06
5.00
3.35
5.45
3.65
5.91
3.96
6.39
4.28
6.89
4.61
7.41
4.96
7.95
5.32
8.51
5.70
9.09
6.08
9.68
6.48
10.30
6.89
10.93
7.32
11.58
7.75
15.13
10.13
19.15
12.82
23.64
15.83
34.04
22.79
46.34
31.02
60.52
40.51
76.60
51.28
94.56
63.30
A
= (m
min
• A
: Minimum installation area of an Indoor unit for a
min
given refrigerant charge m
installation height h
(m
0
• h
: Installation height of the bottom side of the indoor
0
unit + distance from the indoor unit bottom side to the
lowest part for which a refrigerant leak may release to
the indoor area
• m
: total system refrigerant charge that could be
c
released to the indoor area in case of undetected
refrigerant leak.
• LFL: Lower Flammability Limit for R32, 0,307 kg/m
established by EN 378-1:2016 and ISO 817
(kg)
c
• Floor mounted: Refrigerant parts not sealed installed
<0.6m height
• Wall mounted: Refrigerant parts not sealed installed
>1.8m height
• Ceiling mounted: Refrigerant parts not sealed installed
>2.2m height
*/(2.5*LFL^
* h
)
(5/4)
^2
c
0
(kg) and considering the
c
)
2
as
3
9
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