61
360
O
C Smart Air Flow
Cassette Type Indoor Unit
Tubing Permissible Length & Height Difference
Please refer to the attached manual of outdoor units.
Refrigerant Filling Amount
Add the refrigerant according to the installation instruction of outdoor unit. The addition of R410A refrigerant must
be performed with a measure gage to ensure the specied amount while compressor failure can be caused by
lling too much or little refrigerant.
Connecting Procedures of Refrigerant Tubing
Proceed the are tube connecting operation to connect all the refrigerant tubes.
■ Dual wrenches must be used in the connection of indoor unit tubing.
■ Mounting torque refers to the right table.
Tubing Materials & Specications
Please refer to the attached manual of outdoor units.
Model AB072~092MRERA AB122~182MRERA AB242~602MRERA
Tubing size (mm)
Gas pipe Ø9.52 Ø12.7 Ø15.88
Liquid pipe Ø6.35 Ø6.35 Ø9.52
Tubing material Phosphor deoxy bronze seamless pipe (TP2) for air conditioner
Outer Diameter of Tubing
(mm)
Mounting Torque
(N-m)
Increase mounting Torque
(N-m)
Ø6.35 11.8 (1.2kgf-m) 13.7 (1.4kgf-m)
Ø9.52 24.5 (2.5kgf-m) 29.4 (3.0kgf-m)
Ø12.7 49.0 (5.0kgf-m) 53.9 (5.5kgf-m)
Ø15.88 78.4 (8.0kgf-m) 98.0 (10.0kgf-m)
Wrench
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 are 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.
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