6
Copper
pipe
Good
No good
Tilted Uneven Burred
Burr
Copper pipe
Spare
reamer
Pipe cutter
Flare nut
Copper pipe
5-2
FLARING WORK
• Main cause of gas leakage is defect in flaring work.
Perform flaring work correctly in the following proce-
dure.
1. Pipe cutting
• Cut the copper pipe correctly with pipe cutter.
2. Burrs removal
• Completely remove all burrs from the cut cross
section of the pipe.
• Put the end of the copper pipe downward to pre-
vent burrs from dropping in the pipe.
3. Putting nut on
• Remove flare nuts attached to indoor and outdoor
units, then put them on pipe having completed
burr removal.
(not possible to put them on after flaring work)
5. INDOOR/OUTDOOR UNITS CONNECTION FINISHING AND
TEST RUN
Model
Pipe size for indoor unit
Allowable
name
connection pipe size
07
Liquid pipe
ø6.35 mm
ø6.35 mm
09
Gas pipe
ø9.52 mm
ø9.52 mm
12
Liquid pipe
ø6.35 mm
ø6.35 mm
13
Gas pipe
ø9.52/ø12.7 mm
ø9.52/ø12.7 mm
18
Liquid pipe
ø6.35 mm
ø6.35 mm
Gas pipe
ø12.7 mm
ø12.7 mm
24
Liquid pipe
ø6.35 mm
ø6.35 mm
Gas pipe
ø15.88 mm
ø15.88 mm
26
Liquid pipe
ø9.52 mm
ø9.52 mm
Gas pipe
ø15.88 mm
ø15.88 mm
Valve size for outdoor unit
Å
UNIT
Liquid pipe
ø6.35 mm
Gas pipe
ø12.7 mm
ı
UNIT
Liquid pipe
ø6.35 mm
Gas pipe
ø12.7 mm
Ç
UNIT
Liquid pipe
ø6.35 mm
Gas pipe
ø9.52 mm
Î
UNIT
Liquid pipe
ø6.35 mm
Gas pipe
ø9.52 mm
Indoor unit
Î
UNIT
Indoor unit
Ç
UNIT
Outdoor
unit
Indoor unit
ı
UNIT
Indoor unit
Å
UNIT
5-1
FLARED CONNECTIONS
PIPE LENGTH AND HEIGHT DIFFERENCE
Limits
A26WV
A32WV
Pipe length per indoor unit
25 m
max.
25 m
max.
Total pipe length for multi-system
50 m
max.
70 m
max.
Height difference
10 m
max.
10 m
max.
No. of bends per indoor unit
25
max.
25
max.
Total No. of bends for multi-system
50
max.
70
max.
Refrigerant adjustment ....... If pipe length exceeds 40 m, additional refrigerant (R410A) charge is required.
(The outdoor unit is charged with refrigerant for total pipe length up to 40 m.)
Pipe length
Up to 40 m
No additional charge is required.
Exceeding 40 m
Additional charge is required.
(Refer to the table below.)
Refrigerant to be added
20 g/m
×
(refrigerant piping length(m)-40)
• For pipe size, see the table below.
SELECTING PIPE SIZE
The diameter of connection pipes differs according to the type and capacity of indoor units. Match the diameters
of connection pipes for indoor and outdoor units according to the following table.
*
Connections at outdoor unit are described as unit A, B, C and D below corresponding to the indica-
tion on each valve.
• If the diameter of connection pipes does not match the diameter of pipe end connections, use optional
different-diameter joints.
• When connecting the model 12, 13 or 18 to either unit A or B for MXZ-A32WV and B or C for MXZ-A26WV,
use optional different-diameter joints MAC-A454JP because the valve size of gas pipes for the outdoor unit
is ø9.52 mm. (No need to use different-diameter joints if the diameter of the pipe is ø9.52 mm.)
• When connecting the model 07 or 09 to either unit A or B for MXZ-A32WV and A for MXZ-A26WV, use
optional different-diameter joints MAC-A455JP because the valve size of gas pipes for the outdoor unit is
ø12.7 mm.
• When connecting the model 24 to either unit A or B for MXZ-A32WV and A for MXZ-A26WV, use optional
different-diameter joints MAC-A456JP because the valve size of gas pipes for the outdoor unit is ø12.7 mm.
•
Connect the model 26 to unit A only.
Use optional different-diameter joints MAC-A456JP because the valve size of gas pipes for the outdoor unit
is ø12.7 mm and PAC-493PI because the valve size of liquid pipe is ø6.35 mm.
PIPING PREPARATION
1
If you use commercially available copper pipes, use the following table for pipe specifications.
Outside diameter
Wall thickness
Liquid pipe
ø6.35 mm
0.8 mm
Gas pipe
ø9.52 mm
0.8 mm
Gas pipe
ø12.7 mm
1.0 mm
Gas pipe
ø15.88 mm
1.0 mm
2
For insulation material, use 8 mm-thick heat-insulating expended polyethylene with a specific grarity of 0.045.
3
Ensure that the 2 refrigerant pipes are insulated to prevent condensation.
4
Refrigerant pipe bending radius must be 100 mm or more.
CAUTION:
Be sure to use the insulation of specified thickness. Excessive thickness may cause incorrect installa-
tion of the indoor unit and lack of thickness may cause dew drippage.
90
°
(MXZ-A32WV)
MXZ-A26WV
MXZ-A32WV
Valve size for outdoor unit
Å
UNIT
Liquid pipe
ø6.35 mm
Gas pipe
ø12.7 mm
ı
UNIT
Liquid pipe
ø6.35 mm
Gas pipe
ø9.52 mm
Ç
UNIT
Liquid pipe
ø6.35 mm
Gas pipe
ø9.52 mm
