Refrigerant Piping Work - Mitsubishi Electric Mr.SLIM SUZ-KA09NA Manual De Instalación

4. Refrigerant piping work

Fig. 4-1
ø3/8 (9.52)
ø1/2 (12.7)
Fig. 4-2
Copper
pipe
Burr
Flaring tool
Clutch type Wing nut type
Inside is shin-
Smooth all around
ing without any
scratches.
Even length
all around
Fig. 4-3
4
Indoor unit
D
Outdoor unit
E
Indoor unit
A
Outdoor unit
B
ø1/4 (6.35)
ø3/8 (9.52)
Good No good
90°
Tilted Uneven Burred
Copper pipe
Spare reamer
Pipe cutter
A
Copper pipe
Die
Flare nut
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-KA09, KA12,
Max. 65 ft (0 m)
KA15
SUZ-KA18 Max. 100 ft (30 m)
• Height difference limitations are binding regardless of which unit, indoor or out-
door, is positioned higher.
• Refrigerant adjustment ... If pipe length exceeds 25 ft. (7.5 m), additional refrig-
erant (R410A) charge is required.
(The outdoor unit is charged with refrigerant for pipe length up to 5 ft. (7.5 m).)
Up to 5 ft (7.5 m)
Pipe length
Exceeding 5 ft (7.5 m)
SUZ-KA09, KA12, KA15 1.6 oz each 5 ft. (30 g/m)
Refrigerant to
be added
SUZ-KA18
• Table below shows the specifications of pipes commercially available.
Outside
Model Pipe diameter
inch (mm)
For liquid 1/4 (6.35)
SUZ-KA09
For gas 3/8 (9.52)
For liquid 1/4 (6.35)
SUZ-KA12
For gas 3/8 (9.52)
For liquid 1/4 (6.35)
SUZ-KA15
For gas 1/ (1.7)
For liquid 1/4 (6.35)
SUZ-KA18
For gas 1/ (1.7)
• To prevent condensation, insulate the  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.
) 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 ()
0 to 0.0
(0 to 0.5)
(1.0 to 1.5)
1/ (1.7) 1/ (6)
5/8 (15.88) 5/8 (29)
Height Number of
B C
difference bends (one way)
Max. 40 ft (1 m) Max. 10
Max. 50 ft (15 m) Max. 10
No additional charge is required.
Additional charge is required.
(Refer to the table below.)
1.08 oz each 5 ft. (0 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
0.0315 (0.8) 5/16 (8)
foam plastic
0.045 specific
0.0315 (0.8) 5/16 (8)
gravity
0.0315 (0.8) 5/16 (8)
0.0315 (0.8) 5/16 (8)
0.0315 (0.8) 5/16 (8)
Tightening torque
Clutch Wing nut
type tool type tool N·m
(kgf·cm)
for R for R
10 to 13
0.06 to 13.7 to 17.7
(140 to 180)
0.08
5 to 30
(1.5 to .0)
0.04 to 34.3 to 41.
(350 to 40)
0.06
36 to 4
0.08 to 49.0 to 56.4
(500 to 575)
0.10
54 to 58
(.0 to .5)
73.5 to 78.4
(750 to 800)
ft·lb