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4. Installing the refrigerant piping
■
In case of using 1-branch box
Flare connection employed. (No. brazing)
A
C
■
In case of using 2-branch boxes
2 branches pipe (joint)
: optional parts.
A
B
B
C
C
Refrigerant pipe flared connection of branch box
To indoor unit
A
B
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. 4-3
Branch box
C
C
C
Branch box #1
C
C
Branch box #2
Fig. 4-2
mm (inch)
To outdoor
C
D
E
Conversion formula
1/4 F
ø6.35 (1/4)
3/8 F
ø9.52 (3/8)
1/2 F
ø12.7 (1/2)
B
5/8 F
ø15.88 (5/8)
3/4 F
ø19.05 (3/4)
4.3. Selecting pipe size (Fig. 4-2)
Pipe size
A
Liquid pipe
4C36
5C42
ø9.52 (3/8)
8C48
C
8C60
B
• 4C36/5C42/8C48
Liquid pipe
ø9.52 (3/8)
• 8C60
Total capacity of
indoor units
– 54 kBtu/h
54 kBtu/h –
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)
Liquid
Pipe size
unit
(mm (inch))
Gas
■
Pipe size (Branch box-Indoor unit) *Case of P series indoor unit
Indoor unit type (Btu/h)
Liquid
Pipe size
(mm (inch))
Gas
The lineup of a connectable indoor unit depends on a district/areas/country.
Different-diameter joint (optional parts) (Fig. 4-3)
Connected pipes diameter
Model name
MAC-A454JP-E
ø9.52 (3/8) → ø12.7 (1/2)
MAC-A455JP-E
ø12.7 (1/2) → ø9.52 (3/8)
MAC-A456JP-E
ø12.7 (1/2) → ø15.88 (5/8)
PAC-493PI
ø6.35 (1/4) → ø9.52 (3/8)
PAC-SG76RJ-E
ø9.52 (3/8) → ø15.88 (5/8)
PAC-SG75RJ-E ø15.88 (5/8) → ø19.05 (3/4)
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
18
ø6.35
ø6.35
ø6.35
ø6.35
ø6.35
(1/4)
(1/4)
(1/4)
(1/4)
(1/4)
ø9.52
ø9.52
ø9.52
ø12.7
ø12.7
(3/8)
(3/8)
(3/8)
(1/2)
(1/2)
09
12
15
18
ø6.35
ø6.35
ø6.35
ø6.35
ø9.52
(1/4)
(1/4)
(1/4)
(1/4)
(3/8)
ø9.52
ø12.7
ø12.7
ø12.7
ø15.88
(3/8)
(1/2)
(1/2)
(1/2)
(5/8)
Diameter A
mm (inch)
mm (inch)
ø9.52 (3/8)
ø12.7 (1/2)
ø12.7 (1/2)
ø6.35 (1/4)
ø9.52 (3/8)
ø15.88 (5/8)
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)
Connection method
flare
brazing
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)
24
30
36
ø9.52
ø9.52
(3/8)
(3/8)
ø15.88
ø15.88
(5/8)
(5/8)
Diameter B
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)
en
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