Hitachi YUTAKI Series Installation And Operation Manual page 50

REFRIGERANT AND WATER PIPING
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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 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.
Outdoor unit
?
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 )
2
40 PMML0510 rev.1 - 10/2019
Model
RAS-2WHVNP
RAS-2.5WHVNP
RAS-3WHVNP
RAS-(4-6)WH(V)NPE
RAS-8WHNPE
RAS-10WHNPE
Model
RAS-(4-6)WH(V)NPE
Indoor unit RWH-(4.0-6.0)(V)NF(W)E
Refrigerant (R410A): 3.4 kg
Floor 3.0 m
2
Gas leak detector
Fan (m /min)
3
/h (R410A) or 14.4 m /h (R134a)) of the air conditioning system
3 3
Tonnes
Tonnes
R410A
2.27
-
Indoor unit
(RWM-5.0NE(-W))
R (kg) V (m³) C (kg/m )
3
3.4 7.5 0.46
/min or higher per Japanese
3
0.88
1.14
1.35
2.27
3.16
4.11
R134a
-
1.61
Countermeasure
1.0 m /min fan linked with gas
3
leak detector or 0.5 m opening
2