11. Introduction R32/R290 air conditioner installation
11.1 Introduction to Refrigerants R32 & R290
The refrigerants used for air conditioners are environmentally friendly hydrocarbons R32 and R290.
The two kinds of refrigerants are combustible and odorless. Moreover, they can burn and explode
under certain condition. However, there will be no risk of burning and explosion if you comply with the
following table to install your air conditioner in a room with an appropriate area and use it correctly.
Compared with ordinary refrigerants, Refrigerants R32 & R290 are environmentally friendly and do
not destroy the ozone sphere and that their values of greenhouse effect are also very low.
11.1.1 R32/R290 air conditioner installation area requirement
m1=(4m
3
)×LFL, m2=(26m
3
) ×LFL, m3=(130m
3
) ×LFL
Where LFL is the lower flammable limit in kg/m
3
, R290 LFL is 0.038kg/m
3
, R32 LFL is 0.306kg/m
3
.
For the appliances with a charge amount m1<M<m2:
The maximum charge in a room shall be in accordance with the flowing: M
max
=2.5×(LFL)
(5/4)
×h
0
×A
1/2
The required minimum floor area Amin to install an appliance with refrigerant charge M(kg)
Shall be in accordance with following: Amin = (M/ (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 appliance, in kg;
Amin is the required minimum room area, in m2;
A is the room area, in m2;
LFL is the lower flammable limit, in kg/m3;
h0 is the installation height of the appliance, in meters for calculating mmax or Amin, 1.8 m for wall
mounted;
Table GG.1 - Maximum charge (kg)
Category
LFL
(kg/m3)
h0
(m)
Floor area (m
2
)
4
7
10
15
20
30
50
R290
0.038
0.6
0.05
0.07
0.08
0.1
0.11
0.14
0.18
1
0.08
0.11
0.03
0.06
0.09
0.2
0.3
1.8
0.15
0.2
0.24
0.29
0.34
0.41
0.53
2.2
0.18
0.24
0.29
0.36
0.41
0.51
0.65
R32
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 GG.2 - Minimum room area (m2)
Category
LFL
(kg/m3)
h0
(m)
Floor area (m
2
)
4
7
10
15
20
30
50
R290
0.038
0.152kg 0.228kg 0.304kg 0.456kg 0.608kg 0.76kg 0.988kg
0.6
82
146
328
584
912
1514
1
30
53
118
210
328
555
1.8
9
16
36
65
101
171
2.2
6
11
24
43
68
115
R32
0.306
1.224kg 1.836kg 2.448kg 3.672kg 4.896kg 6.12kg 7.956kg
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
Caution:
Please contact the nearest after-sale service center when maintenance is necessary. At the time
of maintenance, the maintenance personnel must strictly comply with the Operation Manual
provided by the corresponding manufacturer and any non-professional is prohibited to maintain
the air conditioner.
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