Installing The Refrigerant Piping; Tions; Warning; Caution - Mitsubishi Electric PCA-RP-KAQ Installation Manual

4. Installing the refrigerant piping

45 2
Flare cutting dimensions
Copper pipe O.D. Flare dimensions
(mm) A dimensions (mm)
6.35
9.52
12.7
15.88
19.05
Copper pipe O.D.
Flare tool for R410A
(mm)
6.35 (1/4")
9.52 (3/8")
12.7 (1/2")
15.88 (5/8")
19.05 (3/4")
Fig. 4-3
Fig. 4-1
8.7 - 9.1
12.8 - 13.2
16.2 - 16.6
19.3 - 19.7
23.6 - 24.0
B
Die
Copper pipe
Fig. 4-2
B (mm)
Clutch type
0 - 0.5
0 - 0.5
0 - 0.5
0 - 0.5
0 - 0.5
4.1. Precautions
• Use ester oil, ether oil or alkylbenzene oil (small amount) as the refrigera-
pipes, to connect the refrigerant pipes. Use refrigerant pipes with the thick-
clean and do not contain any harmful contaminants such as sulfuric com-

Warning:

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.
RP35, 50
Liquid pipe 6.35 thickness 0.8 mm
Gas pipe 12.7 thickness 0.8 mm
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 100 °C or
more, thickness of 12 mm or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam in-
• Use 2 wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections. In-
sulate carefully.
Flare nut tightening torque
Copper pipe O.D. Flare nut O.D.
(mm)
6.35
6.35
9.52
12.7
12.7
15.88
15.88
19.05
Available pipe size
RP35, 50
Liquid side
—
Gas side
4.3. Indoor unit (Fig. 4-3)
Installing procedures
1. Slide the supplied pipe cover over the gas tubing until it is pressed against the
sheet metal inside the unit.
2. Slide the provided pipe cover over the liquid tubing until it is pressed against
the sheet metal inside the unit.
3. Tighten the pipe covers and
bands .
Gas tubing Pipe cover
Liquid tubing Press the pipe cover against the sheet metal.
Band Refrigerant tubing heat insulating material
Pipe cover
4.4. For twin/triple combination
Refer to the outdoor unit installation manual.
RP60-140
9.52 thickness 0.8 mm
15.88 thickness 1.0 mm
Tightening torque
(mm) (N·m)
17 14-18
22 34-42
22 34-42
26 49-61
29 68-82
29 68-82
36 100-120
36 100-120
RP60 RP71-140
6.35 —
at the both ends (20 mm) with the supplied
-
-
-
5