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REFRIGERANT AND WATER PIPING
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
refrigeration ton (= compressor displacement volume / (5.7 m
using the refrigerant.
?
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)
Opening (m
)
Fan (m
2
26
PMML0575 rev.1 - 09/2021
Model
RAS-(4-6)WH(V)NPE
RAS-8WHNPE
RAS-10WHNPE
Refrigerant (R410A): 3.4 kg
Floor 3.0 m
2
(RWM-5.0N1E)
Gas leak detector
/min)
3
/h (R410A) or 14.4 m
3
Indoor unit
R (kg)
V (m³)
C (kg/m
3
3.4
7.5
0.46
/min or higher per Japanese
3
/h (R134a)) of the air conditioning system
3
Tonnes
2.27
3.16
4.11
)
Countermeasure
1.0 m
/min fan linked with gas leak
3
detector or 0.5 m
opening
2
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