Mitsubishi PUMY-P36NKMU1 - Page 7

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4. Installing the refrigerant piping
4.2. Pipe length and height difference (Fig. 4- 1)
B
A
H
B C
L
r
D
e
a
h
b c d
C
C
B
A
A
A
a
b
c d
C
D
e f
H
h
L
r
C C C
C C
C C
C
A, B, C, D (mm [inch])
Liquid pipe Gas pipe
PUMY-P36-48 ø9.52[3/8] ø15.88[5/8]
a, b, c, d, e, f (mm [inch])
Model number Liquid pipe Gas pipe
06, 08, 12, 15, 18 ø6.35[1/4] ø12.7[1/2]
24, 27, 30, 36, 48, 54 ø9.52[3/8] ø15.88[5/8]
Branch kit model
CMY-Y62-G-E
4-Branching header 8-Branching header
CMY-Y64-G-E CMY-Y68-G-E
Piping preparation
1 Tablebelowshowsthespecicationsofpipescommerciallyavailable.
Outside diameter Insulation thickness
Insulation material
mm (inch) mm (inch)
6.35 (1/4) 8 (5/16)
Heat resisting foam plastic 0.045
specicgravity
9.52 (3/8) 8 (5/16)
12.7 (1/2) 8 (5/16)
15.88 (5/8) 8 (5/16)
2 Ensure that the 2 refrigerant pipes are insulated to prevent condensation.
3 Refrigerant pipe bending radius must be 4" (100 mm) or more.
Caution
Be sure to use the insulation of specied thickness. Excessive thickness may
cause incorrect installation of the indoor unit and branch box, and lack of
thickness may cause dew drippage.
Warning:
When pumping down the refrigerant, stop the compressor before disconnect-
ing the refrigerant pipes. The compressor may burst and cause injury if any
foreign substance, such as air, enters the system.
A OutdoorUnit
B First Branch
C Indoor unit
D Cap
A+B+C+D+a+b+c+d+e [ 300 m [984 ft]
L = A+B+C+D+e [ 150 m [492 ft]
ℓ=B+C+D+e[ 30 m [98 ft]
H [ 50 m (Outdoor lower H [ 40 m [131 ft])
h [ 15 m [49 ft]
A+a+b+c+d+e+f [ 300 m [984 ft]
L = A+f [150m[492ft],ℓ=f[ 30 m [98 ft]
H [ 50 m [164 ft] (Outdoor lower H [ 40 m [131 ft])
h [ 15 m [49 ft]
Fig. 4-1
Conversion formula
1/4 F ø6.35(1/4)
3/8 F ø9.52(3/8)
1/2 F ø12.7(1/2)
5/8 F ø15.88(5/8)
3/4 F ø19.05(3/4)
RG79F079H01_EN.indd 7 2/24/2016 2:57:20 PM