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10.2.4 Outdoor Unit 10.2.4.1 Install the Outdoor Unit • After selecting the best location, start installation to Indoor/Outdoor Unit Installation Diagram.
1 Fix the unit on concrete or rigid frame firmly and horizontally by bolt nut (ø13/32”).
2 When installing at roof, please consider strong wind and earthquake.
Please fasten the installation stand firmly with bolt or nails.
Model A B C D
S18NKU-1,
S22NKU-1 24 1/8” 5 5/32” 5/8” 14 3/32”
10.2.4.2 Connect the Piping 10.2.4.2.1 Connecting the piping to indoor 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.
10.2.4.2.2 Connecting the piping to outdoor 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.
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 10.2.4.3.
Do not over tighten, over tightening may cause gas leakage.
Piping size Torque
1/4” 13.3 lbf.ft
3/8” 31.0 lbf.ft
1/2” 40.6 lbf.ft
5/8” 47.9 lbf.ft
3/4” 73.8 lbf.ft