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16
PIPING INSTALLATION
Indoor Unit Pipe Connections
1. Feed refrigerant pipes, drain hose and communication cable assembly through wall hole
from outdoor to the Ceiling Cassette.
2. Pull the piping assembly to the indoor unit. Carefully bend refrigerant pipes to meet indoor
unit connection ports. Use proper tools to avoid kinks.
3. Add a small amount of refrigerant oil to
both ends of the flare fittings.
4. Starting with either refrigerant pipe, carefully
center the pipe to the indoor unit connection
port then hand tighten the flare nut.
5. Repeat procedure with remaining pipe.
6. Tighten both flare nuts using a standard wrench and a torque wrench as shown below.
7. Carefully tighten flare nuts to correct torque level referring to the Torque Table below.
8. Individually insulate each bare refrigerant pipe and joint as shown below to prevent sweating.
Pipe Diameter Nut Size
Tightening Torque
inch (mm) inch (mm) ft-lbs N-m
1/4 (6.35) 1/4 (17) 10 to 13 14 to 18
3/8 (9.5) 3/8 (22) 25 to 30 34 to 42
1/2 (12.7) 1/2 (25) 36 to 45 49 to 61
5/8 (15.9) 5/8 (29) 50 to 60 68 to 82
Liquid pipe
Gas pipe
Front outlet
Insulate pipe connection
Insulate p
ipe
Insulate pipe
2
Reference A:
Cover this portion with insulation
Pipe insulation
Over tightening may damage flare connections and cause leaks.
CAUTION
Copper
piping
Oil applied
(to reduce friction
with the flare nut)
Flare nut
Oil applied
(improves seal
air-tightness)
90
90
Holding spanner
Torque wrench
Ceiling Cassette Unit
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