3-2.Piping Design - Mitsubishi Electric CITY MULTI PEFY-P22VMS-E-S Data Book

3. Piping Design
3-2. Piping Design
3-2-1. PUMY-P-YHMC-C/VHMC-S Piping
PUMY-P-YHMC-C/VHMC-S
The first joint
Fig. 3-2-1A Piping scheme
Table3-2-1-1. Piping length
Item
Total piping length
Farthest IU from OU (L1)
Farthest IU from the first Joint (L2)
Height between OU and IU (OU above IU) H
Height between OU and IU (OU under IU) H'
Height between IU and IU
OU: Outdoor Unit, IU: Indoor Unit
PUMY-P-YHMC-C/VHMC-S
Note1. No Joint after Header; Piping direct to Indoor Unit from Header;
A
Header
a b c
IU IU
IU
Fig. 3-2-1B Piping scheme
Table3-2-1B1. Piping length
Item
Total piping length
Farthest IU from OU (L1)
Farthest IU from Header (L2)
Height between OU and IU (OU above IU) H
Height between OU and IU (OU under IU) H'
Height between IU and IU
A
C
d
Joint
IU
(m [ft.])
Piping in the figure Max. length
A+B+C+D+a+b+c+d+e+f 120 [393']
A+C+D+f / A+B+c 80 [262']
C+D+f / B+c
50 [164']
h
L1
L2
Capped
d e f
IU IU
IU
(m [ft.])
Piping in the figure Max. length
A+a+b+c+d+e+f 120 [393']
A+f 80 [262']
f
50 [164']
h
SYSTEM DESIGN
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.
Header
B
b
a
IU IU
L1
L2
D
e
IU
Table3-2-1-2. Piping "A"size selection rule
Outdoor and the first-Joint/Header
PUMY-P-YHMC-C/VHMC-S=CMY-Y62-G-E
PUMY-P-YHMC-C/VHMC-S=CMY-Y64,Y68-G-Eb ø9.52 [3/8"]
30 [98']
Table3-2-1-3. Piping "B","C","D"size selection rule
20 [65'] Total down-stream Indoor capacity
12 [39'] ~ P182
Table3-2-1-4. Piping "a","b","c","d","e","f"size selection rule
Indoor Unit size
P15,P20,P25,P32,P40,P50
P63,P71,P80,P100,P125,P140
Table3-2-1-5. Joint, Header selection rule
Joint
CMY-Y62-G-E
* For details of installation of Joint, header, and distributor, refer to its Installation Manual.
Note3. Indoor capacity is described as its model size;
For example, PEFY-P32VMA-E-S, its capacity is P32;
Note4. Total down-stream Indoor capacity is the summary of the model size of Indoors
30 [98']
downstream.
For example, PEFY-P25VMA-E-S+PEFY-P32VMA-E-S: Total Indoor
capacity=P25+P32=P57
20 [65']
12 [39']
C7-R Rev.
Capped
c
IU
f
IU
IU : Indoor unit , OU : Outdoor unit
(mm [in.])
Pipe(Liquid) Pipe(Gas)
ø9.52 [3/8"] ø15.88 [5/8"]
ø15.88 [5/8"]
(mm [in.])
Pipe(Liquid) Pipe(Gas)
ø9.52 [3/8"] ø15.88 [5/8"]
(mm [in.])
Pipe(Liquid) Pipe(Gas)
ø6.35 [1/4"] ø12.70 [1/2"]
ø9.52 [3/8"] ø15.88 [5/8"]
4-branch Header 8-branch Header
CMY-Y64-G-E CMY-Y68-G-E
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