Hitachi YUTAKI Series - Page 50

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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 oor 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-2WHVNP 0.88
RAS-2.5WHVNP 1.14
RAS-3WHVNP 1.35
RAS-(4-6)WH(V)NPE 2.27
RAS-8WHNPE 3.16
RAS-10WHNPE 4.11
Model
Tonnes
R410A R134a
Outdoor unit RAS-(4-6)WH(V)NPE 2.27 -
Indoor unit RWH-(4.0-6.0)(V)NF(W)E
-
1.61
? NOTE
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-5.0NE(-W))
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
PMML0510 rev.1 - 10/2019
40