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18 31-5000579 Rev. 2
ENGLISH
INSTALLATION INSTRUCTIONS
Refrigerant Filling Amount:
Add the refrigerant according to the installation instruction of outdoor unit. The addition of R410A refrigerant must be
performed with a digital scale to ensure proper quantities. Compressor failure can be caused by over or under charging
the system.
Connection Procedures of Refrigerant
Connect all the refrigerant tubes via flare connections.
• Dual wrenches must be used in the connection of indoor unit tubing.
• For tightening torque refer to the right table.
Cutting and Enlarging:
Cutting or enlarging pipes should be proceeded by installation personnel according to the operating criterion if the tube is
too long or flare opening is broken.
Vacuumizing:
Vacuumize from the stop valve of outdoor units with vacuum pump. Refrigerant sealed in indoor machine is not allowed to
use for vacuumization.
Open All Valves:
Open all the valves of outdoor units.
[NB: oil balancing stop valve must be shut up completely when connected one main unit.]
Checkup for Air Leakage:
Check if there is any leakage at the connecting part and bonnet with hydrophone or soapsuds.
Outer Diameter of Tubing
in (mm)
Mounting Torque
lb-in (N-m)
Increase mounting Torque
lb-in (N-m)
1/4" (Ø6.35) 104.4 (11.8) 121.2 (13.7)
3/8" (Ø9.52) 216.8 (24.5) 260.1 (29.4)
1/2" (Ø12.7) 443.7 (49.0) 476.9 (53.9)
5/8" (Ø15.88) 710 (78.4) 867.1 (98.0)
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