Water Piping - Hitachi YUTAKI Serie Installations- Und Betriebshandbuch

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 m³/min or higher per Japanese
refrigeration ton (= compressor displacement volume / (5.7 m³/h (R410A) or 14.4 m³/h (R134a)) of the air conditioning system
using the refrigerant.
Outdoor unit
Indoor 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

6.1.3 Water piping

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Water piping length
Consider the following guidelines when designing the water circuit.
Item
Maximum water piping length between indoor unit and
DHW tank
Maximum water piping length between indoor unit and
3-way valve
Maximum water piping length between 3-way valve and
DHW tank
Blanc data: To be informed later.
87 PMML0335A rev.1 - 04/2016
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
RWH-(4.0-6.0)(V)NF(W)E
Refrigerant (R410A): 3.4 kg
Floor 3.0
m2
Gas leak detector
Fan (m /min)
3
Tonnes
Tonnes
R410A
2.27
-
Indoor unit
(RWM-5.0NE)
R (kg) V (m³) C (kg/m³)
3.4 7.5 0.46
YUTAKI S
YUTAKI S
COMBI
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
YUTAKI S80
DHW tank DHW tank
above the beside the
indoor unit indoor unit
YUTAKI M