Piping Design; 11-1.R410A Piping Material - Mitsubishi Electric CITY MULTI PUMY-P48NKMU4 Data Book

11. PIPING DESIGN

11-1. R410A Piping material
11. PIPING DESIGN
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.
11-2. Piping Design
11-2-1. PUMY-P36, 48NKMU4/PUMY-HP36, 42, 48NKMU2
Line-Branch Method
Connection Examples
(Connecting to 4 Indoor Units)
Total Piping Length
Permissible
Farthest Piping Length
Length
Farthest Piping Length After First Branch
High/Low Difference
Permissible High/
Low Difference
in Indoor/Outdoor Section
High/Low Difference in Indoor/Indoor Section
Selecting the Refrigerant Branch Kit
Select Each Section of Refrigerant Piping
(1) Section From Outdoor Unit
to First Branch (A)
(2) Sections From Branch to
Indoor Unit (a,b,c,d)
(3) Section From Branch to
Branch (B,C)
Select the size from the table to the right.
Additional refrigerant charge
M-P0891A
A
B
A+B+C+a+b+c+d
(L)
A+B+C+d 492 ft [150 m]
( )
B+C+d 98 ft [30 m]
The outdoor unit is upper: 164ft [50m] or less
(H)
The outdoor unit is lower: 131ft [40m] or less (98ft [30,] or less if PKFY-P04/06/08/12NLMU,
PFFY-P06/08/12NEMU, and PFFY-P06/08/12NRMU are included.)
(h)
49 ft [15 m]
Use an optional branch piping kit (CMY-Y62-G-E).
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch
(Outdoor Unit Piping Diameter)
Model
Each
Section of
PUMY-(H)P36/42/48
Piping
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
Liquid Line (inch [mm]) Gas Line (inch [mm])
3/8 [ø9.52]
Refer to "11-3. Refrigerant charging calculation".
A
L
B C
a b c
C
C
C
984 ft [300 m]
(2) Refrigerant Piping Diameter In Section
Piping Diameter (inch [mm]) Model number
Liquid Line 3/8 [ø9.52]
Gas Line 5/8 [ø15.88]
5/8 [ø15.88]
A Outdoor Unit
B First Branch
C Indoor unit
d
C
From Branch to Indoor Unit
(Indoor Unit Piping Diameter)
Piping Diameter (inch [mm])
Liquid Line 1/4 [ø6.35]
18 or lower
Gas Line 1/2 [ø12.7]
Liquid Line 3/8 [ø9.52]
24 to 54
Gas Line 5/8 [ø15.88]
S-Series
49