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4. Installing the refrigerant piping
4.1. Precautions
4.1.1. For devices that use R22 refrigerant
• Use the refrigeration oil applied to the flared sections.
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes,
to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses
specified in the table to the below. Make sure the insides of the pipes are
clean and do not contain any harmful contaminants such as sulfuric com-
pounds, oxidants, debris, or dust.
4.1.2. For devices that use R410A refrigerant
• Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration
oil applied to the flared sections.
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes,
to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses
specified in the table to the below. Make sure the insides of the pipes are
clean and do not contain any harmful contaminants such as sulfuric com-
pounds, oxidants, debris, or dust.
Warning:
When installing or moving the air conditioner, use only the specified refriger-
ant (R410A) to charge the refrigerant lines. Do not mix it with any other refriger-
ant and do not allow air to remain in the lines. Air enclosed in the lines can
cause pressure peaks resulting in a rupture and other hazards.
P15 P24, P30, P36
Liquid pipe
1/4" (ø6.35) thickness 1/32" (0.8)
3/8" (ø9.52) thickness 1/32" (0.8)
Gas pipe
1/2" (ø12.7) thickness 1/32" (0.8)
5/8" (ø15.88) thickness 3/64" (1.0)
• Do not use pipes thinner than those specified above.
4.2. Connecting pipes (Fig. 4-1)
• When commercially available copper pipes are used, wrap liquid and gas pipes
with commercially available insulation materials (heat-resistant to 212 °F (100 °C)
or more, thickness of 1/2 in. (12 mm) or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam insu-
lation materials (specific gravity of 0.03, thickness of 23/64 in. (9 mm) or more).
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tightening
flare nut.
• Use two wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections. Insu-
late carefully.
B Flare nut tightening torque
Copper pipe O.D. Flare nut O.D. Tightening torque
in. (mm) in. (mm) ft·lbs. (N·m)
1/4" (ø6.35) 43/64 (17) 10-13 (14 - 18)
1/4" (ø6.35) 7/8 (22) 25-30 (34 - 42)
3/8" (ø9.52) 7/8 (22) 25-30 (34 - 42)
1/2" (ø12.7) 1-3/64 (26) 35-44 (49 - 61)
1/2" (ø12.7) 1-9/64 (29) 49-59 (68 - 82)
5/8" (ø15.88) 1-9/64 (29) 49-59 (68 - 82)
5/8" (ø15.88) 1-27/64 (36) 72-87 (100 - 120)
3/4" (ø19.05) 1-27/64 (36) 72-87 (100 - 120)
C Apply refrigerating machine oil over the entire flare seat surface.
D Use correct flare nuts meeting the pipe size of the outdoor unit.
Available pipe size
P15 P24, P30 P36
Liquid side
1/4" (ø6.35) ––
– 3/8" (ø9.52)
3/8" (ø9.52)
1/2" (ø12.7) ––
Gas side –
5/8" (ø15.88)
5/8" (ø15.88)
––3/4" (ø19.05)
: Factory flare nut attachment to the heat-exchanger.
A Flare cutting dimensions
Copper pipe O.D.
Flare dimensions
øA dimensions
1/4" (ø6.35) 11/32-23/64 (8.7 - 9.1)
3/8" (ø9.52) 1/2-33/64 (12.8 - 13.2)
1/2" (ø12.7) 41/64-21/32 (16.2 - 16.6)
5/8" (ø15.88) 49/64-25/32 (19.3 - 19.7)
3/4" (ø19.05) 15/16-61/64 (23.6 - 24.0)
B
C
D
Fig. 4-1
A Die
B Copper pipe
A
A
B
Fig. 4-2
A
Copper pipe O.D. Flare tool for R22 Flare tool for R410A
Clutch type
1/4" (ø6.35) 0-1/64 (0 - 0.5) 3/64-1/16 (1.0 - 1.5)
3/8" (ø9.52) 0-1/64 (0 - 0.5) 3/64-1/16 (1.0 - 1.5)
1/2" (ø12.7) 0-1/64 (0 - 0.5) 3/64-1/16 (1.0 - 1.5)
5/8" (ø15.88) 0-1/64 (0 - 0.5) 3/64-1/16 (1.0 - 1.5)
3/4" (ø19.05) 0-1/64 (0 - 0.5) 3/64-1/16 (1.0 - 1.5)
in. (mm)
90° ±0.5°
øA
R1/64 to R1/32
A
45°±2°
in. (mm)
in. (mm)
in. (mm)