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4. Refrigerant piping work
D
B
C
Fig. 4-1
A
ø1/2 (12.7)
ø5/8 (15.88)
Fig. 4-2
Copper
pipe
Burr
Flaring tool
Clutch type
Wing nut type
Inside is shining
Smooth all around
without any
scratches.
Even length all
around
4
A
Indoor unit
D
Outdoor unit
E
E
Indoor unit
A
Outdoor unit
B
ø1/4 (6.35)
ø3/8 (9.52)
B
Good
No good
90°
Tilted
Uneven Burred
Copper pipe
Spare reamer
Pipe cutter
A
Copper pipe
Die
Flare nut
Fig. 4-3
4.1. Refrigerant pipe (Fig. 4-1, Fig. 4-2)
► Check that the difference between the heights of the indoor and outdoor
units, the length of refrigerant pipe, and the number of bends in the pipe are
within the limits shown below.
Pipe length
A
Models
(one way)
SUZ-KA18
Max. 100 ft (30 m)
SUZ-KA24, KA30,
Max. 100 ft (30 m)
KA36
• Height difference limitation is defined regardless of which unit, indoor or outdoor,
is positioned higher.
• Refrigerant adjustment ... If pipe length exceeds 25 ft. (7.5 m), additional refriger-
ant (R410A) charge is required.
(The outdoor unit is charged with refrigerant for pipe length up to 25 ft. (7.5 m).)
Up to 25 ft (7.5 m)
Pipe length
Exceeding 25 ft (7.5 m)
SUZ-KA18
Refrigerant to
be added
SUZ-KA24, KA30, KA36 2.69 oz each 5 ft. (50 g/m)
• Table below shows the specifications of pipes commercially available.
Outside
diameter
Model
Pipe
inch (mm)
For liquid
1/4 (6.35)
SUZ-KA18
For gas
1/2 (12.7)
For liquid
3/8 (9.52)
SUZ-KA24
For gas
5/8 (15.88) 0.0315 (0.8)
For liquid
3/8 (9.52)
SUZ-KA30
For gas
5/8 (15.88) 0.0315 (0.8)
For liquid
3/8 (9.52)
SUZ-KA36
For gas
5/8 (15.88) 0.0315 (0.8)
• To prevent condensation, insulate the 2 refrigerant pipes.
• Refrigerant pipe bending radius must be 4 in. (100 mm) or more
Caution:
Be sure to use the insulation of specified thickness (table on the above). Excessive
insulation may cause incorrect installation of the indoor unit, and too little insulation
may cause condensate to form.
• The unit has flared connections on both indoor and outdoor sides.
• Remove the valve cover from the outdoor unit, then connect the pipe.
• Refrigerant pipes are used to connect the indoor and outdoor units.
• Be careful not to crush or over bend the pipe in pipe bending.
4.2. Flaring work (Fig. 4-3)
1) Cut the cooper pipe as straight as possible with a pipe cutter.
2) Remove all burrs from the cut section of pipe, ensuring that precautions are taken
to avoid getting metal shavings into the piping.
3) Remove flare nuts attached to indoor and outdoor units, then put them on pipe.
4) Flaring work. Firmly hold copper pipe in the dimension shown in the table. Select
A inch (mm) from the table according to the tool you use.
5) Check
• Compare the flared work.
• If flare is defective, cut off the section and repeat procedure.
A inch (mm)
Pipe diameter
Nut
Clutch
inch (mm)
inch (mm)
type tool
for R410A
1/4 (6.35)
1/4 (17)
3/8 (9.52)
3/8 (22)
0 to 0.02
(0 to 0.5)
(1.0 to 1.5)
1/2 (12.7)
1/2 (26)
5/8 (15.88)
5/8 (29)
Height
Number of
B
C
difference
bends (one way)
Max. 50 ft (15 m)
Max. 10
Max. 100 ft (30 m)
Max. 10
No additional charge is required.
Additional charge is required.
(Refer to the table below.)
1.08 oz each 5 ft. (20 g/m)
Min. wall
Insulation
Insulation
thickness
thickness
material
inch (mm)
inch (mm)
0.0315 (0.8)
5/16 (8)
0.0315 (0.8)
5/16 (8)
0.0315 (0.8)
5/16 (8)
Heat resisting
5/16 (8)
foam plastic
0.045 specific
0.0315 (0.8)
5/16 (8)
gravity
5/16 (8)
0.0315 (0.8)
5/16 (8)
5/16 (8)
Tightening torque
Clutch
Wing nut
type tool
type tool
N·m
(kgf·cm)
for R22
for R22
10 to 13
13.7 to 17.7
0.06 to
(140 to 180)
0.08
25 to 30
(1.5 to 2.0)
34.3 to 41.2
0.04 to
(350 to 420)
0.06
36 to 42
49.0 to 56.4
0.08 to
(500 to 575)
0.10
54 to 58
(2.0 to 2.5)
73.5 to 78.4
(750 to 800)
ft·lb
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