Mitsubishi PUMY-P36NKMU1 Installation Manual page 7

4. Installing the refrigerant piping
4.2. Pipe length and height difference (Fig. 4-1)
A
A+a+b+c+d+e+f [ 300 m [984 ft]
A
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]
A
L
r
B
D
a b c d e
C C
C C C
Fig. 4-1
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
L
r
e
B C D
a b c d
B
C
C C C
C
A Outdoor Unit
B First Branch
C Indoor unit
D Cap
f
C
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)
A, B, C, D
Liquid pipe
PUMY-P36-48 ø9.52 [3/8]
a, b, c, d, e, f
Model number Liquid pipe
06, 08, 12, 15, 18 ø6.35 [1/4]
24, 27, 30, 36, 48, 54 ø9.52 [3/8]
Branch kit model
CMY-Y62-G-E
4-Branching header
CMY-Y64-G-E
Piping preparation
1 Table below shows the specifications of pipes commercially available.
Outside diameter Insulation thickness
mm (inch) mm (inch)
6.35 (1/4) 8 (5/16)
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 specified 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.
(mm [inch])
Gas pipe
ø15.88 [5/8]
(mm [inch])
Gas pipe
ø12.7 [1/2]
ø15.88 [5/8]
8-Branching header
CMY-Y68-G-E
Insulation material
Heat resisting foam plastic 0.045
specific gravity
7