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Page 27
6.
Place aring tool onto the form.
7.
Turn the handle of the aring tool clockwise
until the pipe is fully ared.
8.
Remove the aring tool and are form, then
inspect the end of the pipe for cracks and
successful, even aring.
Step 4: Connect pipes
When connecting refrigerant pipes, be careful
not to use excessive torque, or to deform the
piping in any way. You should first connect the
low-pressure pipe, then the high-pressure pipe.
MINIMUM BEND RADIUS
When bending connective refrigerant piping,
the minimum bending radius is 10cm (4”). See
Fig.5.6.
≥10cm (4in)Radius
Instructions for Connecting Piping to
Indoor Unit
1.
Align the center of the two pipes that you will
connect. See Fig. 5.7
Indoor unit tubing Flare nut Pipe
2.
Tighten the are nut as tightly as possible by
hand.
3.
Using a spanner, grab the nut on the unit
tubing.
4.
While rmly holding the nut on the unit
tubing, use a torque wrench to tighten the
are nut according to the torque values in the
“Torque Requirements” table below. Loosen
the aring nut slightly, then tighten again.
Fig. 5.6
Fig. 5.7
Fig. 5.8
Refrigerant
Piping
Connection
TORQUE REQUIREMENTS
Outer Diameter of Pipe (mm) Tightening Torque (N•cm) Add. Tightening Torque (N•cm)
Ø 6.35 (Ø 1/4”) 1,500 (11 lb • ft) 1,600 (11.8 lb • ft)
Ø 9.52 (Ø 3/8”) 2,500 (18.4 lb • ft) 2,600 (19.2 lb • ft)
Ø 12.7 ( Ø 1/2”) 3,500 (25.8 lb•ft) 3,600 (26.6 lb•ft)
Ø 16 ( Ø 5/8”)
Ø 19 ( Ø 3/4”)
4,500 (33.2 lb•ft)
6,500 (47.9 lb•ft)
4,700 (34.7 lb•ft)
6,700 (49.4 lb•ft)
DO NOT USE EXCESSIVE TORQUE
Excessive force can break the nut or damage the refrigerant piping. You must not exceed the torque
requirements shown in the table above.
If provided by your supplier, apply leak guard
material on all ared mating surfaces.
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