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11.2.3 Connect the Piping
11.2.3.1 Connecting the Piping to Indoor Unit
Please make flare after inserting flare nut (locate at
joint portion of tube assembly) onto the copper pipe.
(In case of using long piping)
Connect the piping
Align the center of piping and sufficiently tighten
the flare nut with fingers.
Further tighten the flare nut with torque wrench in
specified torque as stated in the table.
Do not overtighten, overtightening may cause gas leakage
Piping size Torque
1/4" (6.35 mm) 13.3 Ibf•ft [18 N•m (1.8 kgf•m)]
3/8" (9.52 mm) 31.0 Ibf•ft [42 N•m (4.3 kgf•m)]
1/2" (12.7 mm) 40.6 Ibf•ft [55 N•m (5.6 kgf•m)]
5/8" (15.88 mm) 47.9 Ibf•ft [65 N•m (6.6 kgf•m)]
3/4" (19.05 mm) 73.8 Ibf•ft [100 N•m (10.2 kgf•m)]
11.2.3.2 Connecting the Piping to Outdoor Unit
Decide piping length and then cut by using pipe cutter.
Remove burrs from cut edge. Make flare after
inserting the flare nut (locate at valve) onto the copper
pipe. Align center of piping to valve and then tighten
with torque wrench to the specified torque as stated in
the table.
11.2.3.3 Connecting the Piping to Outdoor Multi
Decide piping length and then cut by using pipe cutter. Remove burrs from cut edge. Make flare after inserting the
flare nut (locate at valve) onto the copper pipe. Align center of piping to valve and then tighten with torque wrench to
the specified torque as stated in the table.
11.2.3.4 Gas Leak Checking
Pressure test to system to 400 PSIG with dry nitrogen, in stages. Thoroughly leak check the system.
If the pressure holds, release the nitrogen and proceed to section 11.2.4.
Torque wrench
Spanner
or Wrench
Female side
Male side
Female sideMale side
(Connection pipe)
(Auxiliary pipe)
(Auxiliary pipe)
Wrench (Adjustable Wrench)
Wrench (Adjustable Wrench)
Torque Wrench f or Flare Nut
Applicable to
Liquid side of
CS-E12***
CS-E18***
Applicable to
Gas side of
CS-E12***
CS-E18***
Torque Wrench for Flare Nut
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