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2) When there is an effective opening with the adjacent room for ventilation of leaking refrigerant gas
(opening without a door, or an opening 0.15 % or larger than the respective floor spaces at the top or
bottom of the door).
3) If an indoor unit is installed in each partitioned room and the refrigerant piping is interconnected, the
smallest room of course becomes the object. But when a mechanical ventilation is installed interlocked
with a gas leakage detector in the smallest room where the density limit is exceeded, the volume of the
next smallest room becomes the object.
Very
small
room
Small
room
Mechanical ventilation device - Gas leak detector
NOTE 3
The minimum indoor floor area compared with the amount of refrigerant is roughly as follows:
(When the ceiling is 2.7 m high)
40
Range below the
35
m²
density limit of
0.3 kg/m³
30
(countermeasures
not needed)
25
20
15
10
5
0
65-EN
Important
Outdoor unit
Refrigerant piping
Indoor unit
Refrigerant piping
Outdoor unit
Indoor unit
Medium
Large room
room
Range above the
density limit of 0.3 kg/m³
(countermeasures
needed)
10
20
30
Total amount of refrigerant
kg
– 33 –
66-EN
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