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INSTALLATION MANUAL---Important considerations for R32/R290
21
The maximum charge and the required minimum floor area
33 3
m = (4 m ) x LFL , m = (26 m )) x LFL, m = (130 m )x LFL
12 3
333
Where LFL is the lower flammable limit in kg/ m R290 LFL is 0.038 kg/ m ,R32 LFL is 0.038 kg/ m.
For the appliances with a charge amount m < M = m :
12
(5/4)
The maximum charge in a room shall be in accordance with the following:m = 2 5 x (LFL) x h
max
1/2
x (A)
The required minimum floor area Amin to install an appliance with refrigerant charge M (kg)
(5/4) 2
shall be in accordance with following: A = (M/ (2 5 x (LFL)x h))
min
Where:
m is the allowable maximum charge in a room, in kg;
max
M is the refrigerant charge amount in appliance, in kg;
Amin is the required minimum room area, in m2;
2
A is the room area, in m ;
3
LFL is the lower flammable limit, in kg/m ;
h is the installation height of the appliance,in meters for calculating m or A , 1 8 m for wall
max min
mounted;
Table GG.1 - Maximum charge (kg)
Category
R290 0.038
R32 0.306
LFL
3
(kg/m )
h
0
(m)
2
Floor area (m )
0.6 0.05 0.07 0.08 0.1 0.11 0.14 0.18
4 7 10 15 20 30 50
1 0.08 0.11 0.13 0.16 0.19 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
0.6 0.68 0.9 1.08 0.32 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
2
Table GG.2 - Minimum room area (m )
Category
R290 0.038
R32 0.306
LFL
3
(kg/m )
h
0
(m)
Charge amount (M) (kg)
2
Minimum room area (m )
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
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
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