Design of 3WAY VRF SYSTEM
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5. HOW TO INSTALL THE OUTDOOR UNIT
Design of 3WAY VRF SYSTEM
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.
Tu bing 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
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 tubing (Existing tubing can be used.)
Tubing size (in. (mm))
Material: O Material: O
Outer diameter Wall thickness Outer diameter Wall thickness
1/4" (6.35) 0.025 (0.635) 7/8" (22.22) 0.045 (1.143)
3/8" (9.52) 0.030 (0.762) 1-1/8" (28.58) 0.050 (1.27)
1/2" (12.7) 0.035 (0.889) 1-3/8" (34.92)0.055 (1.397)
5/8" (15.88) 0.040 (1.016) 1-5/8" (41.28) 0.060 (1.524)
3/4" (19.05) 0.042 (1.0668)
5-5. Connect the Tubing
Use the supplied connector tubing.
Ty pe 72 (6 To n)
Ty pe 120 (10 Ton)
Refrigerant
tubing
Connection
method
Use Supplied
connector
tube?
1
Suction tube Brazing No
2
Discharge tube FlareNo
3
Liquid tube FlareNo
4
Balance tube FlareNo
Ty pe 96 (8 To n)
Ty pe 144 (12 Ton)
Refrigerant
tubing
Connection
method
Use Supplied
connector
tube?
1
Suction tube Brazing No
2
Discharge tube
Service valve
mounted on the
unit side: Flare
counection
Tubing side: Brazing
Ye s
ø5/8” (ø15.88)
Flare
↓
ø3.4” (ø19.05)
Brazing
3
Liquid tube FlareNo
4
Balance tube FlareNo
Refrigerant
tubing
Connection
method
Use Supplied
connector tube?
1
Suction tube Brazing
Ye s
ø1" ø1-1/8"
(ø25.4
ø28.58)
2
Discharge tube Brazing
Ye s
ø3/4" ø7/8"
(ø19.05
ø22.22)
3
Liquid tube FlareNo
4
Balance tube FlareNo
Supplied
tube
Supplied
tube
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.
If not, the gas leak will be occurred.
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)
In case of type 96
Unit: in. (mm)
7'B⡿ྥࡅ:$<LQGE
TD831183-00_北米向け3WAY.indb 36 15/12/17 16:05:18
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