INSTRUCTIONS FOR CONNECTING PIPING
TO OUTDOOR UNIT
1 Unscrew the cover from the packed valve on
the side of the outdoor unit. (See
FIG. 5.9
)
2 Remove protective caps from ends of valves.
3 Align flared pipe end with each valve, and
tighten the flare nut as tightly as possible by hand.
4 Using a spanner, grip the body of the valve.
DO NOT
grip the nut that seals the service
valve. (See
FIG. 5.10
)
USE SPANNER TO GRIP MAIN
BODY OF VALVE
Torque from tightening the flare nut can snap
off other parts of valve.
5 While firmly gripping the body of the valve, use a
torque wrench to tighten the flare nut according to
the correct torque values.
6 Loosen the flaring nut slightly, then tighten again.
7 Repeat Steps 3 to 6 for the remaining pipe.
DO NOT USE EXCESSIVE TORQUE
Excessive force can break the nut or damage the refrigerant piping. You must not exceed torque requirements
shown in the table above.
WARNING
TORQUE REQUIREMENTS
Outer Diameter of Pipe (mm)
Tightening Torque (N•cm)
Add. Tightening Torque (N•m)
Ø 6.35 (Ø 0.25”)
1,500 (11lb •ft)
1,600 (11.8lb •ft)
Ø 9.52 (Ø 0.375”)
2,500 (18.4lb •ft)
2,600 (19.18lb •ft)
Ø 12.7 ( Ø 0.5”)
3,500 (25.8lb•ft)
3,600 (26.55lb•ft)
Ø 16 ( Ø 0.63”)
4,500 (33.19lb•ft)
4,700 (34.67lb•ft)
Valve
cover
FIG. 5.9
FIG. 5.10
AIR EVACUATION
PREPARATIONS AND PRECAUTIONS
Air and foreign matter in the refrigerant circuit can
cause abnormal rises in pressure, which can damage
the air conditioner, reduce its efficiency, and cause
injury. Use a vacuum pump and manifold gauge to
evacuate the refrigerant circuit, removing any non-
condensable gas and moisture from the system.
Evacuation should be performed upon initial
installation and when unit is relocated.
BEFORE PERFORMING EVACUATION
• Check to make sure that both high pressure
and low-pressure pipes between the indoor and
outdoor units are connected properly in
accordance with the Refrigerant Piping
Connection section of this manual.
• Check to make sure all wiring is connected
properly.
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