Installing The Refrigerant Piping - Mitsubishi Electric PCA-A-KA Installation Manual

4. Installing the refrigerant piping

45 2
Fig. 4-1
A Flare cutting dimensions
Copper pipe O.D.
1/4" (ø6.35)
3/8" (ø9.52)
1/2" (ø12.7)
5/8" (ø15.88)
3/4" (ø19.05)
B
Fig. 4-2
Copper pipe O.D.
1/4" (ø6.35)
3/8" (ø9.52)
1/2" (ø12.7)
5/8" (ø15.88)
3/4" (ø19.05)
Fig. 4-3
in. (mm)
Flare dimensions
ø A dimensions
11/32-23/64 (8.7 - 9.1)
1/2-33/64 (12.8 - 13.2)
41/64-21/32 (16.2 - 16.6)
49/64-25/32 (19.3 - 19.7)
29/32-59/64 (22.9 - 23.3)
Die
Copper pipe
in. (mm)
B
Flare tool for R410A
Clutch type
0-1/64 (0 - 0.5)
0-1/64 (0 - 0.5)
0-1/64 (0 - 0.5)
0-1/64 (0 - 0.5)
0-1/64 (0 - 0.5)
4.1. Precautions
For devices that use R410A refrigerant
• Use ester oil, ether oil or alkylbenzene oil (small amount) as the refrigera-
tion oil applied to the fl ared sections.
• Use C1220 copper phosphorus for copper and copper alloy seamless
pipes, to connect the refrigerant pipes. Use refrigerant pipes with the thick-
nesses specifi ed in the table 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 specifi ed refriger-
ant (R410A) to charge the refrigerant lines. Do not mix it with any other refrig-
erant 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.
A24, 30, 36, 42
Liquid pipe 3/8" (ø9.52) thickness 1/32" (0.8)
Gas pipe 5/8" (ø15.88) thickness 3/64" (1.0)
• Do not use pipes thinner than those specifi ed 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 in-
sulation materials (specifi c 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
fl are nut.
• Use 2 wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections. In-
sulate carefully.
B Flare nut tightening torque
Copper pipe O.D. Flare nut O.D.
(mm, inch)
ø6.35, 1/4
ø6.35, 1/4
ø9.52, 3/8
ø12.7, 1/2
ø12.7, 1/2
ø15.88, 5/8
ø15.88, 5/8 36, 1-27/64
ø19.05, 3/4 36, 1-27/64
C Apply refrigerating machine oil over the entire fl are seat surface.
D Use correct fl are nuts meeting the pipe size of the outdoor unit.
4.3. Indoor unit (Fig. 4-3)
Installing procedures
1. Slide the supplied pipe cover 2 over the gas tubing until it is pressed against the
sheet metal inside the unit.
2. Slide the provided pipe cover 3 over the liquid tubing until it is pressed against
the sheet metal inside the unit.
3. Tighten the pipe covers 2 and 3 at the both ends 3/4 in. (20 mm) with the sup-
plied bands 4.
A Gas tubing E Pipe cover 3
B Liquid tubing F Press the pipe cover against the sheet metal.
C Band 4 G Refrigerant tubing heat insulating material
D Pipe cover 2
4.4. For twin combination
Refer to the outdoor unit installation manual.
in. (mm)
Tightening torque
(mm, inch) (N-m, ft.lbs)
17, 43/64 14-18, 10-13
22, 7/8 34-42, 25-30
22, 7/8 34-42, 25-30
26, 1-3/64 49-61, 35-44
29, 1-9/64 68-82, 49-59
29, 1-9/64 68-82, 49-59
100-120, 71-86
100-120, 71-86
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