Mitsubishi Electric CITY MULTI PUMY-P48NKMU4 Data Book page 55

11. PIPING DESIGN
Header-Branch Method
Connection Examples
(Connecting to 4 Indoor Units)
Total Piping Length
Permissible
Farthest Piping Length
Length
Farthest Piping Length After First Branch
Permissible High/ High/Low Difference in Indoor/Outdoor Section
Low Difference
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)
Select the size from the table to the right.
Additional refrigerant charge
M-P0891A
A
A
B
a
C
A+a+b+c+d 492 ft [150 m]
(L)
A+d 262 ft [80 m]
( )
d 98 ft [30 m]
(H)
164 ft [50 m] (If the outdoor unit is lower, 131 ft [40 m])
(h)
49 ft [15 m]
Please select branching kit, which is sold separately, from the table below.
(The kit comprises sets for use with liquid pipes and for use with gas pipes.)
Branch header (4 branches)
CMY-Y64-G-E
(1) Refrigerant Piping Diameter In Section
From Outdoor Unit to First Branch
(Outdoor Unit Piping Diameter)
Each
Model
Section of
Piping
PUMY-P60
(3) Refrigerant Piping Diameter In Section
From Branch to Branch
Liquid Line (inch [mm])
3/8 [ø9.52]
Refer to "11-3. Refrigerant charging calculation".
L
b c
C
C
Branch header (8 branches)
CMY-Y68-G-E
(2) Refrigerant Piping Diameter In Section
Piping Diameter (inch[mm]) Model number
Liquid Line 3/8 [ø9.52]
18 or lower
Gas Line 3/4 [ø19.05]
Gas Line (inch [mm])
3/4 [ø19.05]
d
C
A Outdoor Unit
B First Branch
C Indoor unit
From Branch to Indoor Unit
(Indoor Unit Piping Diameter)
Piping Diameter (inch[mm])
Liquid Line 1/4 [ø6.35]
Gas Line 1/2 [ø12.7]
Liquid Line 3/8 [ø9.52]
24 to 54
Gas Line 5/8 [ø15.88]
Liquid Line 3/8 [ø9.52]
72
Gas Line 3/4 [ø19.05]
S-Series
53