Mitsubishi Electric MSZ-FS18NA Manuel D'installation page 24

4. Installing the refrigerant piping
4.2. Pipe length and height difference
4.2.1. Connection without Branch Box (Fig. 4-1)
A
A
B C
a b c
B
C
C C
A+B+C+D+a+b+c+d+e
L = A+B+C+D+e
R = B+C+D+e
H Outdoor higher
Outdoor lower
h
* When PKFY-P06NBMU, PKFY-P08NHMU, PKFY-P04/06/08/12NLMU, PFFY-
P06/08/12NEMU, or PFFY-P06/08/12NRMU is included, use within 30 m [98 ft].
A
A
B
a b c d
C C
C C C
A+a+b+c+d+e+f
L = A+f
R = f
H Outdoor higher
Outdoor lower
h
* When PKFY-P06NBMU, PKFY-P08NHMU, PKFY-P04/06/08/12NLMU, PFFY-
P06/08/12NEMU, or PFFY-P06/08/12NRMU is included, use within 30 m [98 ft].
en
7
L
A Outdoor Unit
r
B First Branch
e
D
C Indoor unit
d
C
C
SM36/42/48
[ 300 m [984 ft] [ 150 m [492 ft]
[ 150 m [492 ft] [ 80 m [262 ft]
[ 30 m [98 ft]
[ 50 m [164 ft]
[ 40 m [131 ft]* [ 40 m [131 ft]
[ 15 m [49 ft]
L
A Outdoor Unit
r B First Branch
C Indoor unit
D
D Cap
e f
C
SM36/42/48
[ 300 m [984 ft] [ 150 m [492 ft]
[ 150 m [492 ft] [ 80 m [262 ft]
[ 30 m [98 ft]
[ 50 m [164 ft]
[ 40 m [131 ft]* [ 40 m [131 ft]
[ 15 m [49 ft]
Fig. 4-1
Conversion formula
1/4 F
3/8 F
1/2 F
5/8 F
3/4 F
A, B, C, D
SM36/42/48
SM60
a, b, c, d, e, f
Model number
04, 05, 06, 08, 12, 15, 18
24, 27, 30, 36, 48, 54
72
SM60
4-Branching header
CMY-Y64-G-E
Piping preparation
1 Table below shows the specifications of pipes commercially available.
Outside diameter
mm (inch)
6.35 (1/4)
9.52 (3/8)
12.7 (1/2)
15.88 (5/8)
19.05 (3/4)
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 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.
SM60
ø6.35 (1/4)
ø9.52 (3/8)
ø12.7 (1/2)
ø15.88 (5/8)
ø19.05 (3/4)
Liquid pipe Gas pipe
ø15.88 [5/8]
ø9.52 [3/8]
ø19.05 [3/4]
Liquid pipe Gas pipe
ø6.35 [1/4] ø12.7 [1/2]
ø9.52 [3/8] ø15.88 [5/8]
ø9.52 [3/8] ø19.05 [3/4]
Branch kit model
CMY-Y62-G-E
8-Branching header
CMY-Y68-G-E
Insulation thickness
Insulation material
mm (inch)
8 (5/16)
8 (5/16)
Heat resisting foam plastic 0.045
8 (5/16)
specific gravity
8 (5/16)
8 (5/16)
(mm [inch])
(mm [inch])