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FILE NO. SVM-13010
WARNINGS ON REFRIGERANT LEAKAGE
Check of Concentration Limit
The room in which the air conditioner is to be installed requires a design that in the event of refrigerant
gas leaking out, its concentration will not exceed a set limit.
The refrigerant R410A which is used in the air conditioner is safe, without the toxicity or combustibility of
ammonia, and is not restricted by laws to be imposed which protect the ozone layer. However, since it contains
more than air, it poses the risk of suffocation if its concentration should rise excessively. Suffocation from
leakage of R410A is almost non-existent.
If a conditioner system is to be installed in a small room, select a suitable model and installation procedure so
that if the refrigerant accidentally leaks out, its concentration does not reach the limit (and in the event of an
emergency, measures can be made before injury can occur).
In a room where the concentration may exceed the limit, create an opening with adjacent rooms, or install
mechanical ventilation combined with a gas leak detection device.
The concentration is as given below.
Total amount of refrigerant (kg)
≤
Concentration limit (kg/m
3
)
Min. volume of the indoor unit installed room (m
3
)
The concentration limit of R410A which is used in air conditioners is 0.3 kg/m
3
.
NOTE
The minimum indoor floor area compared with the amount of refrigerant is roughly as follows:
(When the ceiling is 2.7m high)
Range above the
density limit of
0.3 kg/m
3
(countermeasures
needed)
40
m
2
35
30
25
20
15
10
10
Total amount of refrigerant
Min. indoor floor area
20
30
kg
5
0
Range below the
density limit of
0.3 kg/m
3
(countermeasures
not needed)
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