5
After Sales Support
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Installation Safety Instructions (Cont.)
Maximum charge and minimum floor area
m
1
= (4m
3
) x LFL
m
2
= (26m
3
) x LFL
m
3
= (130m
3
) x LFL
Where
LFL
is the lower flammable limit in kg/m
3
, the LFL for R32 is 0.306 kg/m
3
.
For appliances with a charge amount m
1
<
M
≤
m
2
:
• The maximum charge in a room shall be in accordance with the following:
m
max
= 2.25 x
(LFL)
(5/4)
x
h
0
x (A)
1/2
• The required minimum floor area A
min
to install an appliance with refrigerant
charge
M
(kg) shall be in accordance with the following:
A
min
= (
MI (2.5 x (LFL)
(5/4)
x h
0
))
2
Where:
• m
max
is the allowable maximum charge in a room, in kg;
• M
is the refrigerant charge amount in the appliance, in kg;
• A
min
is the required minimum room area, in m
2
;
• A
is the room area, in m
2
;
• LFL
is the lower flammable limit, in kg/m
3
;
• h
0
is the installation height of the appliance, in metres, for calculating
m
max
or
A
min
, 1.8m for wall-mounted.
Table 1: Maximum charge (kg): R32
LFL
(kg/m
3
)
h
0
(m)
Floor area
(m
2
)
4
7
10
15
20
30
50
0.306
0.6
0.68
0.9
1.08
1.32
1.53
1.87
2.41
1
1.14
1.51
1.8
2.2
2.54
3.12
4.02
1.8
2.05
2.71
3.24
3.97
4.58
5.61
7.254
2.2
2.5
3.31
3.96
4.85
5.6
6.86
8.85
Table 2: Minimum room area (m
2
): R32
LFL
(kg/m
3
)
h
0
(m)
Charge amount (
M
)
(kg)
Minimum room area
(m
2
)
1.224kg
1.836kg
2.448kg 3.672kg 4.896kg
6.12kg
7.956kg
0.306
0.6
29
51
116
206
321
543
1
10
19
42
74
116
196
1.8
3
6
13
23
36
60
2.2
2
4
9
15
24
40