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REFRIGERANT AND WATER PIPING
Refrigerant piping size
Piping connection size of outdoor unit & indoor unit
Model
(4-6)HP
Ø 15.88 (5/8")
8HP
10HP
6.4.1.1 Refrigerant charge before shipment (W
YUTAKI S/S COMBI
Outdoor unit model
RAS-4WH(V)NPE
RAS-(5/6)WH(V)NPE
RAS-8WHNPE
RAS-10WHNPE
YUTAKI S80
Model
Outdoor unit
RAS-(5/6)WH(V)NPE
Indoor unit
RWH-(4.0-6.0)(V)NF(W)E
YUTAKI M
Model
RASM-4(V)NE
RASM-(5/6)(V)NE
6.4.2 Precautions in the event of gas refrigerant leaks
The installers and those responsible for drafting the specifications are obliged to comply with local safety codes and regulations in
the case of refrigerant leakage.
!
C A U T I O N
•
Check for refrigerant leakage in detail. If a large refrigerant leakage occurred, it would cause difficulty with breathing or harmful gases would occur
if a fire were in the room.
•
If the flare nut is tightened too hard, it may crack over time and cause refrigerant leakage.
Maximum permitted concentration of HFCs
The refrigerant R410A (charged in the outdoor unit) and the refrigerant R134a (in case of YUTAKI S80 indoor unit) are incombustible
and non-toxic gases. However, if leakage occurs and gas fills a room, it may cause suffocation.
The maximum permissible concentration of HFC gas according to EN378-1 is:
54
PMML0575 rev.2 - 03/2022
Pipe size
Gas pipe
Liquid pipe
Ø 9.52 (3/8")
Ø 9.52 (3/8")
Ø 25.4 (1")
Ø 12.7 (1/2")
W
(kg) R410A
0
RAS-4WH(V)NPE
Refrigerant
Maximum permissible concentration (kg/m
R410A
R134a
Model
(3.0-6.0)HP
8HP
10HP
(kg))
0
W
(kg)
0
3.3
3.4
5.0
5.3
W
(kg) R134a
0
3.3
-
3.4
-
-
1.9
W
(kg)
0
2.8
3.1
0.44
0.25
Indoor unit
Pipe size
Gas pipe
Liquid pipe
Ø 15.88 (5/8")
Ø 9.52 (3/8")
Ø 9.52 (3/8")
Ø 25.4 (1")
Ø 12.7 (1/2")
)
3
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