Mitsubishi Electric MXZ-SM72TAM-U1 Service Manual page 156

4. Installing the refrigerant piping
I In the case of using 1-branch box
Flare connection employed. (No. brazing)
A
I In the case of using 2-branch boxes
2 branches pipe (joint)
A B
C
I In the case of using 3-branch boxes
2 branches pipe (joint)
A
B
C C C
Branch box #3
Refrigerant pipe flared connection of branch box
A
Liquid pipe ø6.35 (1/4) ø6.35 (1/4) ø6.35 (1/4) ø6.35 (1/4) ø6.35 (1/4) ø9.52 (3/8)
Gas pipe ø9.52 (3/8) ø9.52 (3/8) ø9.52 (3/8) ø9.52 (3/8) ø12.7 (1/2) ø15.88 (5/8)
* 3-branch type : only A, B, C
A
Fig. 4-4
A (outside)
en
2-branch pipe (Joint): Optional parts (According to the connection method,
you can choose the favorite one.)
Model name
MSDD-50AR-E
MSDD-50BR-E
CMY-Y62-GA-E
■
Installation procedure (2 branches pipe (Joint))
Refer to the Installation Manuals of MSDD-50AR-E, MSDD-50BR-E and
CMY-Y62-GA-E.
11
Branch box
C C C
: optional parts.
Branch box #1
B
C C
Branch box #2
: optional parts.
A
Branch box #1
B B
C C
Branch box #2
Fig. 4-3
To indoor unit
B C D E
Conversion formula
1/4 F
3/8 F
1/2 F
B
5/8 F
3/4 F
7/8 F
1-1/8 F ø28.58 (1-1/8)
B (inside)
Fig. 4-5
Connection method
flare
brazing
brazing
Selecting pipe size (Fig. 4-3)
A
Model
MXZ-SM72
MXZ-SM96
MXZ-SM120
C C B
Total down-stream
capacity of indoor units
– 54 kBtu/h
54 – 76 kBtu/h
76 kBtu/h –
C C
C
The piping connection size differs according to the type and capacity of indoor units.
Match the piping connection size of branch box with indoor unit.
If the piping connection size of branch box does not match the piping connection
size of indoor unit, use optional different-diameter (deformed) joints to the branch
box side.
(Connect deformed joint directly to the branch box side.)
■
Pipe size (Branch box-Indoor unit) *Case of M series or S series Indoor unit
Indoor unit type (Btu/h)
Pipe size
C C
(mm (in))
■
Pipe size (Branch box-Indoor unit) *Case of P series indoor unit
Indoor unit type (Btu/h)
Pipe size
(mm (in))
mm (in)
To outdoor
The lineup of a connectable indoor unit depends on a district/areas/country.
unit
Different-diameter joint (optional parts) (Fig. 4-4, 4-5)
Model name
MAC-A454JP-E ø9.52 (3/8)
ø6.35 (1/4) MAC-A455JP-E ø12.7 (1/2)
ø9.52 (3/8)
MAC-A456JP-E ø12.7 (1/2)
ø12.7 (1/2)
PAC-493PI
ø15.88 (5/8)
PAC-SG76RJ-E ø9.52 (3/8)
ø19.05 (3/4)
PAC-SG75RJ-E ø15.88 (5/8)
ø22.2 (7/8)
PAC-SG71RJ-E ø15.88 (5/8)
PAC-SL02RJ-E ø15.88 (5/8)
PAC-SL03RJ-E ø22.2 (7/8)
*1 When connecting to MSDD-50AR-E or a branch box, flare the pipes on-site.
Use the nuts that are included with the 2-branch pipe and branch box.
*2 Brazing
Piping preparation
1 Table below shows the specifications of pipes commercially available.
Outside diameter
mm (in)
6.35 (1/4)
9.52 (3/8)
12.7 (1/2)
15.88 (5/8)
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 branch box, and lack of
thickness may cause dew drippage.
mm [in]
Liquid pipe Gas pipe
ø9.52 [3/8] ø22.2 [7/8]
ø9.52 [3/8] ø22.2 [7/8]
ø12.7 [1/2] ø28.58 [1-1/8]
Model Liquid pipe
MXZ-SM72 ø9.52 [3/8]
MXZ-SM96 ø9.52 [3/8]
MXZ-SM120 ø12.7 [1/2]
MXZ-SM72 ø9.52 [3/8]
MXZ-SM96 ø9.52 [3/8]
MXZ-SM120 ø12.7 [1/2]
MXZ-SM72 ø9.52 [3/8]
MXZ-SM96 ø9.52 [3/8]
MXZ-SM120 ø12.7 [1/2]
06 09 12 15
ø6.35 ø6.35 ø6.35 ø6.35
Liquid
(1/4) (1/4) (1/4) (1/4)
ø9.52 ø9.52 ø9.52 ø12.7
Gas
(3/8) (3/8) (3/8) (1/2)
09 12 15 18
ø6.35 ø6.35 ø6.35 ø6.35
Liquid
(1/4) (1/4) (1/4) (1/4)
ø9.52 ø12.7 ø12.7 ø12.7
Gas
(3/8) (1/2) (1/2) (1/2)
Connected pipes diameter Diameter A
mm (in)
→ ø12.7 (1/2) ø9.52 (3/8)
→ ø9.52 (3/8) ø12.7 (1/2)
→ ø15.88 (5/8) ø12.7 (1/2)
ø6.35 (1/4) → ø9.52 (3/8) ø6.35 (1/4)
→ ø15.88 (5/8) ø9.52 (3/8)
→ ø19.05 (3/4) ø15.88 (5/8)
→ ø22.2 (7/8) ø15.88 (5/8)
*1 *2
→ ø28.58 (1-1/8) ø15.88 (5/8)
*1 *2
→ ø28.58 (1-1/8) ø22.2 (7/8)
*2
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)
Gas pipe
ø15.88 [5/8]
ø19.05 [3/4]
ø22.2 [7/8]
18 24
30 36
ø6.35 ø9.52
ø9.52 ø9.52
(1/4) (3/8)
(3/8) (3/8)
ø12.7 ø15.88
ø15.88 ø15.88
(1/2) (5/8)
(5/8) (5/8)
24 30 36
ø9.52 ø9.52 ø9.52
(3/8) (3/8)
(3/8)
ø15.88 ø15.88
ø15.88
(5/8) (5/8)
(5/8)
Diameter B
mm (in) mm (in)
ø12.7 (1/2)
ø9.52 (3/8)
ø15.88 (5/8)
ø9.52 (3/8)
ø15.88 (5/8)
ø19.05 (3/4)
ø22.2 (7/8)
*1 *2
ø28.58 (1-1/8)
*1 *2
ø28.58 (1-1/8)
*2
Insulation material
specific gravity