Specifications

3. Piping Design
DATA U10
SYSTEM DESIGN 4 - 24
S.D. S
3. Piping Desi gn
3-1. R410A Piping material
The maximum operation pressure of R410A air conditioner is 4.15 MPa [601 psi]. The refrigerant piping should ensure the safety
under the maximum operation pressure. You shall follow the local industrial standard.
3-2. Piping Design
Table3-2-1-1. Piping length (m [ft.])
Item Piping in the figure Max. length
Total piping length
A+B+C+D+a+b+c+d+e+f 120 [393']
Farthest IU from OU (L1) A+C+D+f / A+B+c 80 [262']
Farthest IU from the first Joint (L2) C+D+f / B+c 30 [98']
Height between OU and IU (OU above IU) H 50 [164']
Height between OU and IU (OU under IU) H' 20 [65']
Height between IU and IU h 12 [39']
OU: Outdoor Unit, IU: Indoor Unit
Table3-2-1B1. Piping length (m [ft.])
Item Piping in the figure Max. length
Total piping length A+a+b+c+d+e+f 120 [393']
Farthest IU from OU (L1) A+f 80 [262']
Farthest IU from Header (L2) f 30 [98']
Height between OU and IU (OU above IU) H 50 [164']
Height between OU and IU (OU under IU) H' 20 [65']
Height between IU and IU h 12 [39']
Table3-2-1-2. Piping "A"size selection rule (mm [in.])
Outdoor and the first-Joint/Header Pipe(Liquid) Pipe(Gas)
PUMY-P-NHMU=CMY-Y62-G-E
ø 9.52 [3/8"] ø 15.88 [5/8"]
PUMY-P-NHMU=CMY-Y64,Y68-G-Eb
ø 9.52 [3/8"] ø 15.88 [5/8"]
Table3-2-1-3. Piping "B","C","D"size selection rule (mm [in.])
Total down-stream Indoor capacity Pipe(Liquid) Pipe(Gas)
~ P62
ø 9.52 [3/8"] ø 15.88 [5/8"]
Table3-2-1-4. Piping "a","b","c","d","e","f"size selection rule (mm [in.])
Indoor Unit size Pipe(Liquid) Pipe(Gas)
P06,P08,P12,P15,P18
ø 6.35 [1/4"] ø 12.70 [1/2"]
P24,P27,P30,P36,P48,P54
ø 9.52 [3/8"] ø 15.88 [5/8"]
Table3-2-1-5. Joint, Header selection rule
Joint 4-branch Header 8-branch Header
CMY-Y62-G-E CMY-Y64-G-E CMY-Y68-G-E
* For details of installation of Joint, header, and distributor, refer to its Installation Manual.
Header
A
a
b
c d
Capped
e f
H (H')
h
L1
L2
IU IU
IU IU IU
IU
Fig. 3-2-1B Piping scheme
Note3. Indoor capacity is described as its model size.
For example, PEFY-P08NMAU-E3, capacity P08;
Note4. Total down-stream Indoor capacity is the summary of the model size of Indoors
downstream.
For example, PEFY-P08NMAU-E3+PEFY-P06NMAU-E3: Total Indoor
capacity=P08+P06=P14;
Capped
Header
IU IU IU
IU
IUIU
The first joint
H(H')
h
Joint
B
C
A
D
a
b
c
d
e
f
L2
L1
PUMY-P-NHMU
3-2-1. PUMY-P-NHMU Piping
PUMY-P-NHMU
IU : Indoor unit , OU : Outdoor unit
Note1. No Joint after Header; Piping direct to Indoor Unit from Header;
Fig. 3-2-1A Piping scheme
Note1. No Joint after Header; Piping direct to Indoor Unit from Header.
Note2. The system can be designed to use only Joints, only Header,
or use both Joints and Header.