Installing The Refrigerant Piping - Mitsubishi Electric PCA-RP35KAQ Installationshandbuch

4. Installing the refrigerant piping

A B
45 2
A
Flare cutting dimensions
Copper pipe O.D. Flare dimensions
[A dimensions (mm)
(mm)
[6.35
[9.52
[12.7
[15.88
[19.05
E
F
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
C
Fig. 4-1
8.7 - 9.1
12.8 - 13.2
16.2 - 16.6
19.3 - 19.7
23.6 - 24.0
B
E
Die
F
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
For devices that use R410A refrigerant
• Use ester oil, ether oil or alkylbenzene oil (small amount) as the refrigera-
tion 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 thick-
nesses specified in the table below. Make sure the insides of the pipes are
D
clean and do not contain any harmful contaminants such as sulfuric com-
pounds, oxidants, debris, or dust.
Warning:
When installing or relocating, or servicing the air conditioner, use only the
specified refrigerant (R410A) to charge the refrigerant lines. Do not mix it
with any other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high
pressure in the refrigerant line, and may result in an explosion and other haz-
ards.
The use of any refrigerant other than that specified for the system will cause
mechanical failure or system malfunction or unit breakdown. In the worst
case, this could lead to a serious impediment to securing product safety.
Liquid pipe 6.35 thickness 0.8 mm
Gas pipe 12.7 thickness 0.8 mm
• 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 100 °C or
more, thickness of 12 mm or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam in-
sulation materials (specific gravity of 0.03, thickness of 9 mm or more).
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tighten-
ing flare nut.
• 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.
(mm)
6.35
6.35
9.52
12.7
12.7
15.88
15.88
19.05
Apply refrigerating machine oil over the entire flare seat surface.
Use correct flare nuts meeting the pipe size of the outdoor unit.
Available pipe size
Liquid side
Gas side
Ο : Factory flare nut attachment to the heat exchanger.
4.3. Indoor unit (Fig. 4-3)
Installing procedures
1. Slide the supplied pipe cover
sheet metal inside the unit.
2. Slide the provided pipe cover
the sheet metal inside the unit.
3. Tighten the pipe covers
bands .
Gas tubing
Liquid tubing
Band
Pipe cover
4.4. For twin/triple combination
Refer to the outdoor unit installation manual.
RP35, 50 RP60-140
9.52 thickness 0.8 mm
15.88 thickness 1.0 mm
Flare nut O.D. Tightening torque
(mm)
17
22
22
26
29
29
36
36
RP35, 50 RP60
6.35 Ο 6.35
— 9.52 Ο
12.7 Ο 15.88 Ο
over the gas tubing until it is pressed against the
over the liquid tubing until it is pressed against
and at the both ends (20 mm) with the supplied
Pipe cover
Press the pipe cover against the sheet metal.
Refrigerant tubing heat insulating material
(N·m)
14-18
34-42
34-42
49-61
68-82
68-82
100-120
100-120
RP71-140
—
9.52 Ο
15.88 Ο
5