Countermeasure in the event of possible refrigerant leakage
The room must have the following features to prevent suffocation in case a refrigerant leakage occurs:
1
Provide a shutterless opening which will allow fresh air to circulate into the room.
2
Provide a doorless opening of 0.15% or more size to the floor area.
3
There must be a ventilator fan connected to a gas leak detector, with a ventilator capacity of 0.4 m
3
/min or higher per Japanese
refrigeration ton (= compressor displacement volume / (5.7 m
3
/h (R410A) or 14.4 m
3
/h (R134a)) of the air conditioning system
using the refrigerant.
Model
Tonnes
RAS-(4-6)WH(V)NPE
2.27
RAS-8WHNPE
3.16
RAS-10WHNPE
4.11
?
N O T E
Always take the maximum value between the R410A and R134a.
4
Pay special attention to the place, such as a basement, etc., where the refrigerant can stay, since refrigerant is heavier than air.
Example:
Outdoor unit (RAS-5WHVNPE)
Refrigerant (R410A): 3.4 kg
Gas leak detector
Fan (m
3
/min)
Height 2.5 m
Floor 3.0 m
2
Opening (m
2
)
Indoor unit
(RWM-5.0N1E)
R (kg)
V (m³)
C (kg/m
3
)
Countermeasure
3.4
7.5
0.46
1.0 m
3
/min fan linked with gas leak
detector or 0.5 m
2
opening
REFRIGERANT AND WATER PIPING
PMML0575 rev.1 - 09/2021
26
