Refrigerant piping size
Piping connection size of outdoor unit & indoor unit
Indoor unit
Model
Pipe size
Model
Pipe size
Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
(4-6)HP
Ø 15.88 (5/8”)
Ø 9.52 (3/8”)
(3.0-6.0)HP
Ø 15.88 (5/8”)
Ø 9.52 (3/8”)
8HP
Ø 25.4 (1”)
Ø 9.52 (3/8”)
8HP
Ø 25.4 (1”)
Ø 9.52 (3/8”)
10HP
Ø 12.7 (1/2”)
10HP
Ø 12.7 (1/2”)
6.4.1.1 Refrigerant charge before shipment (W
0
(kg))
YUTAKI S/S COMBI
Outdoor unit model
W
0
(kg)
RAS-4WH(V)NPE
3.3
RAS-(5/6)WH(V)NPE
3.4
RAS-8WHNPE
5.0
RAS-10WHNPE
5.3
YUTAKI S80
Model
W
0
(kg) R410A
W
0
(kg) R134a
Outdoor unit
RAS-4WH(V)NPE
3.3
-
RAS-(5/6)WH(V)NPE
3.4
-
Indoor unit
RWH-(4.0-6.0)(V)NF(W)E
-
1.9
YUTAKI M
Model
W
0
(kg)
RASM-4(V)NE
2.8
RASM-(5/6)(V)NE
3.1
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:
Refrigerant
Maximum permissible concentration (kg/m
3
)
R410A
0.44
R134a
0.25
REFRIGERANT AND WATER PIPING
PMML0575 rev.2 - 03/2022
54
