Aiwa -09CHSRINV/TP11 Service Manual page 24

Introduction R32, R290 air conditioner installation
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.
2) R32/R290 air conditioner installation area requirement
3
m1=(4m )×LFL, m2=(26m
Where LFL is the lower flammable limit in kg/m
For the appliances with a charge amount m1<M<m2:
The maximum charge in a room shall be in accordance with the flowing: M
The required minimum floor area A
accordance with following: A
Where:
M is the allowable maximum charge in a room, in kg;
max
M is the refrigerant charge amount in appliance, in kg;
A is the required minimum room area, in m2;
min
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 M
LFL
Category
(kg/m3)
R290 0.038
R32 0.306
LFL
Category
(kg/m3)
R290 0.038
R32 0.306
Air Conditioner Service Manual
3
) ×LFL, m3=(130m
to install an appliance with refrigerant charge M(kg) shall be in
min
= (M/ (2.5 x (LFL)
min
Table GG.1 - Maximum charge (kg)
h0
(m)
4
0.6 0.05
1 0.08
1.8 0.15
2.2 0.18
0.6 0.68
1 1.14 1.51
1.8 2.05 2.71
2.2 2.5 3.31
Table GG.2 - Minimum room area (m2)
h0
(m)
0.152kg 0.228kg 0.304kg 0.456kg 0.608kg
0.6 / 82
1 / 30
1.8 / 9
2.2 / 6
1.224kg 1.836kg 2.448kg 3.672kg 4.896kg
0.6 / 29
1 / 10
1.8 / 3
2.2 / 2
3
) ×LFL
3
, R290 LFL is 0.038kg/m
(5/4) 0
x h )) 2
Floor area (m
Maximum charge (kg)
7 10 15
0.07 0.08 0.1
0.11 0.03 0.06
0.2 0.24 0.29
0.24 0.29 0.36
0.9 1.08 1.32
1.8 2.2
3.24 3.97
3.96 4.85
Charge amount (M) (kg)
Minimum room area (m2)
146 328
53 118
16 36
11 24
51 116
19 42
6 13
4 9
3
, R32 LFL is 0.306kg/m
(5/4)
=2.5×(LFL) ×h
max
or A , 1.8 m for wall mounted;
max min
2
)
20 30
0.11 0.14
0.09 0.2
0.34 0.41
0.41 0.51
1.53 1.87
2.54 3.12
4.58 5.61
5.6 6.86
0.76kg 0.988kg
584 912
210 328
65 101
43 68
6.12kg 7.956kg
206 321
74 116
23 36
15 24
3
.
1/2
×A
0
50
0.18
0.3
0.53
0.65
2.41
4.02
7.254
8.85
1514
555
171
115
543
196
60
40
26