Panasonic U-72MF2U9 Technical Data Manual page 52

5. HOW TO INSTALL THE OUTDOOR UNIT
5. HOW TO INSTALL THE OUTDOOR UNIT
5-4. Prepare the Tubing
Material: Use clean, dry, free of oil, refrigeration grade, seamless, phosphorous deoxidized copper tube rated for R410A only.
Wall thickness shall comply with the applicable legislation. The minimal wall thickness must be in accordance with the table below.
Tubing size: Use the tubing size indicated in the table below.
When cutting the tubing, use a tube cutter, and be sure to remove any burrs.
(The same applies to distribution tubing (optional).)
When bending the tubes, bend each tube using a radius that is at least 4 times the outer diameter of the tube.
When bending, use sufficient care to avoid crushing or damaging the tube.
For flaring, use a flare tool, and be sure that flaring is performed correctly.
CAUTION
1
5-5. Connect the Tubing
2
Use the supplied connector tubing.
Type 72 (6 Ton)
3
4
Type 96 (8 Ton)
5
Supplied
tube
6
In case of type 96
7
8
9
Use sufficient caution during
preparation of the tubing.
Seal the tube ends by means
of caps or taping to prevent
dust, moisture, or other foreign
substances from entering the
tubes.
Refrigerant Connection
tubing method
Suction tube Brazing
1
Discharge tube Flare
2
Liquid tube Flare
3
Balance tube Flare
4
Refrigerant Connection
tubing method
Suction tube Brazing
1
Service valve
mounted on the
Discharge tube unit side: Flare
2
counection
Tubing side: Brazing
Liquid tube Flare
3
Balance tube Flare
4
Flaring process to the tip of the supplied tubes
Remove flare nuts attached to the service valve and reuse them.
Note: Make sure the service valve is completely closed.
Use the wide area of the outer tubing surface of the supplied tubes.
• Supplied tubing outer diameter ø3/4 (ø19.05)
• Local tubing inner diameter ø3/4 (ø19.05)
Refrigerant tubing (Existing tubing can be used.)
Material: O
Outer diameter
1/4" (6.35)
3/8" (9.52)
1/2" (12.7)
5/8" (15.88)
3/4" (19.05)
Type 120 (10 Ton)
Type 144 (12 Ton)
Use Supplied
connector
tube?
No
No
No
No
Supplied
tube
Use Supplied
connector
tube?
No
Yes
ø5/8" (ø15.88)
Flare
↓
ø3.4" (ø19.05)
Brazing
No
No
If not, the gas leak will be occurred.
2 - 36
Design of 3WAY VRF SYSTEM
Design of 3WAY VRF SYSTEM
Tubing size (in. (mm))
Material: O
Wall thickness Outer diameter
0.025 (0.635) 7/8" (22.22)
0.030 (0.762) 1-1/8" (28.58)
0.035 (0.889) 1-3/8" (34.92)
0.040 (1.016) 1-5/8" (41.28)
0.042 (1.0668)
Refrigerant Connection
tubing method
Suction tube Brazing
1
Discharge tube Brazing
2
Liquid tube Flare
3
Balance tube Flare
4
Wall thickness
0.045 (1.143)
0.050 (1.27)
0.055 (1.397)
0.060 (1.524)
Unit: in. (mm)
Use Supplied
connector tube?
Yes
ø1" ø1-1/8"
(ø25.4 ø28.58)
Yes
ø3/4" ø7/8"
(ø19.05 ø22.22)
No
No