Mitsubishi Electric MSZ-FS18NA Manuel D'installation page 26

4. Installing the refrigerant piping
■
In case of using 1-branch box
Flare connection employed. (No. brazing)
A
■
In case of using 2-branch boxes
2 branches pipe (joint)
A B
C
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
en
9
Branch box
C C C
: optional parts.
Branch box #1
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
Pipe size
A
Liquid pipe
SM36
SM42
ø9.52 (3/8)
SM48
SM60
C C
B
• SM36/42/48
Liquid pipe
ø9.52 (3/8)
• SM60
Total capacity of
indoor units
– 54 kBtu/h
54 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)
mm (inch)
Pipe size
To outdoor
(mm (inch))
unit
■
Pipe size (Branch box-Indoor unit) *Case of P series indoor unit
Indoor unit type (Btu/h)
Pipe size
ø6.35 (1/4)
(mm (inch))
ø9.52 (3/8)
ø12.7 (1/2)
ø15.88 (5/8)
The lineup of a connectable indoor unit depends on a district/areas/country.
ø19.05 (3/4)
Different-diameter joint (optional parts) (Fig. 4-4)
Model name
MAC-A454JP-E
MAC-A455JP-E
MAC-A456JP-E
PAC-493PI
PAC-SG76RJ-E
PAC-SG75RJ-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 branch box, and lack of
thickness may cause dew drippage.
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
■
Installation procedure (2 branches pipe (Joint))
Refer to the installation manuals of MSDD-50AR-E and MSDD-50BR-E.
Gas pipe
ø15.88 (5/8)
ø19.05 (3/4)
Gas pipe
ø15.88 (5/8)
Liquid pipe Gas pipe
ø9.52 (3/8) ø15.88 (5/8)
ø9.52 (3/8) ø19.05 (3/4)
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 (inch)
ø9.52 (3/8) → ø12.7 (1/2) ø9.52 (3/8)
ø12.7 (1/2) → ø9.52 (3/8) ø12.7 (1/2)
ø12.7 (1/2) → ø15.88 (5/8) ø12.7 (1/2)
ø6.35 (1/4) → ø9.52 (3/8) ø6.35 (1/4)
ø9.52 (3/8) → ø15.88 (5/8) ø9.52 (3/8)
ø15.88 (5/8) → ø19.05 (3/4) ø15.88 (5/8)
Insulation thickness
mm (inch)
8 (5/16)
8 (5/16)
Heat resisting foam plastic 0.045
8 (5/16)
8 (5/16)
8 (5/16)
Connection method
flare
brazing
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 (inch) mm (inch)
ø12.7 (1/2)
ø9.52 (3/8)
ø15.88 (5/8)
ø9.52 (3/8)
ø15.88 (5/8)
ø19.05 (3/4)
Insulation material
specific gravity