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PIPING INSTALLATION
Outdoor Unit Pipe Connections
17
1. Remove service valve cover (if provided) to access
the service valves and refrigerant ports.
2. Carefully bend and adjust length of refrigerant pipes
to meet outdoor unit service valve connections
with 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.
7. Carefully tighten flare nuts to correct torque level referring to the Torque Table below.
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
Copper
piping
Oil applied
(to reduce friction
with the flare nut)
Flare nut Oil applied
(improves seal
air-tightness)
Over tightening may damage flare connections and cause leaks.
CAUTION
Gas pipe
3-way valve
R
2-way valve
Liquid pipe
or
Pipe
coupling
Service
Valve Cover
Service
Valve Cover
90
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