Mitsubishi Electric PUMY-P36NKMU4 Manuel D'installation page 10

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
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.
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
Connection method
flare
brazing
Pipe size
A
Liquid pipe
P36
P42
ø9.52 (3/8)
P48
P60
C C
B
• P36/42/48
Liquid pipe
ø9.52 (3/8)
• P60
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 (in)
Pipe size
To outdoor
(mm (in))
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 (in))
ø9.52 (3/8)
ø12.7 (1/2)
ø15.88 (5/8)
When both of following bullet are satisfied gas piping diagram size shall be in-
ø19.05 (3/4)
creased by one size.
(1) Indoor units which connected are all of A-COIL type (PAA-A).
(2) Total piping length is 33 ft (10 m) or less.
The lineup of a connectable indoor unit depends on a district/areas/country.
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 (in)
ø6.35 (1/4)
ø9.52 (3/8)
ø12.7 (1/2)
ø15.88 (5/8)
ø19.05 (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.
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 (in)
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 (in)
8 (5/16)
8 (5/16)
Heat resisting foam plastic 0.045
8 (5/16)
8 (5/16)
8 (5/16)
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)
Insulation material
specific gravity