Mitsubishi Electric MXZ-SM72TAM-U1 Service Manual page 154

4. Installing the refrigerant piping
4.2. Pipe length and height difference
4.2.1. Connection without Branch Box (Fig. 4-1)
A+B+C+D+a+b+c+d+e ≤ 310 m [1016 ft]
A
L = A+B+C+D+e ≤ 130 m [426 ft]
R= B+C+D+e ≤ 30 m [98 ft]
H ≤ 50 m [164 ft] (Outdoor lower H ≤ 40 m [131 ft])
h ≤ 15 m [49 ft]
A
B C
a b
B
C
C
A A+a+b+c+d+e+f ≤ 310 m [1016 ft]
L = A+f ≤ 130 m [426 ft], R= f ≤ 30 m [98 ft]
H ≤ 50 m [164 ft] (Outdoor lower H ≤ 40 m [131 ft])
h ≤ 15 m [49 ft]
A
B
a b c
C C
C C
Caution:
Always keep to the limit on the total amount of refrigerant. Exceeding the
limit on the total amount of refrigerant when charging will lead to malfunc-
tion. Refer to 4.7 for the calculation of the amount of refrigerant.
en
9
L
R
e
D
c d
C C
C
L
R
D
d e f
C
C
Fig. 4-1
Conversion formula
1/4 F
3/8 F
1/2 F
5/8 F
3/4 F
7/8 F
1-1/8 F
A
Model
MXZ-SM72
MXZ-SM96
MXZ-SM120
B, C, D
Total down-stream
capacity of indoor
units
– 54 kBtu/h
54 – 76 kBtu/h
76 – 124 kBtu/h
124 kBtu/h –
L: The farthest piping length from the outdoor unit to an indoor unit.
* ø12.7 [1/2] when connecting the indoor unit for PEFY-P72 or P96.
a, b, c, d, e, f
Outdoor Unit
A
Model number
First Branch
B
04, 05, 06, 08, 12, 15, 18
Indoor unit
C
24, 27, 30, 36, 48, 54
Cap
D
4-Branching header
CMY-Y64-G-E
When connecting the branch kit and branching header to ø28.58 [1-1/8] size pip-
ing, PAC-SL03RJ-E is also required.
Piping preparation
1 Table below shows the specifications of pipes commercially available.
ø6.35 (1/4)
Outside diameter
ø9.52 (3/8)
mm (in)
ø12.7 (1/2)
6.35 (1/4)
ø15.88 (5/8)
9.52 (3/8)
ø19.05 (3/4)
12.7 (1/2)
ø22.2 (7/8)
15.88 (5/8)
ø28.58 (1-1/8)
19.05 (3/4)
22.2 (7/8)
28.58 (1-1/8)
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.
Liquid pipe
All
ø9.52 [3/8]*
L ≤ 90 m [295 ft]
ø9.52 [3/8]*
L > 90 m [295 ft]
ø12.7 [1/2]
All
ø12.7 [1/2]
Model Liquid pipe
MXZ-SM72 All
L ≤ 90 m [295 ft] ø9.52 [3/8]
MXZ-SM96
L > 90 m [295 ft] ø12.7 [1/2]
MXZ-SM120 All
MXZ-SM72 All
L ≤ 90 m [295 ft] ø9.52 [3/8]*
MXZ-SM96
L > 90 m [295 ft] ø12.7 [1/2]
MXZ-SM120 All
MXZ-SM72 All
L ≤ 90 m [295 ft] ø9.52 [3/8]*
MXZ-SM96
L > 90 m [295 ft] ø12.7 [1/2]
MXZ-SM120 All
MXZ-SM120 All
Liquid pipe
ø6.35 [1/4]
ø9.52 [3/8]
72 ø9.52 [3/8]
96 ø9.52 [3/8]
Branch kit model
CMY-Y62-G-E
8-Branching header
Insulation thickness
mm (in)
8 (5/16)
8 (5/16)
8 (5/16)
Heat resisting foam plastic 0.045
8 (5/16)
8 (5/16)
8 (5/16)
8 (5/16)
mm [in]
Gas pipe
ø22.2 [7/8]
ø22.2 [7/8]
ø28.58 [1-1/8]
Gas pipe
ø9.52 [3/8]
ø15.88 [5/8]
ø12.7 [1/2]
ø9.52 [3/8]*
ø19.05 [3/4]
ø12.7 [1/2]
ø9.52 [3/8]*
ø22.2 [7/8]
ø12.7 [1/2]
ø12.7 [1/2] ø28.58 [1-1/8]
mm [in]
Gas pipe
ø12.7 [1/2]
ø15.88 [5/8]
ø19.05 [3/4]
ø22.2 [7/8]
CMY-Y68-G-E
Insulation material
specific gravity