Installing The Refrigerant Piping - Mitsubishi Electric TRANE TPCA0A 1KA70 Series Instruction Manual

4. Installing the refrigerant piping
A B
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)
E
F
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)
C
DE
G
Fig. 4-3
C
in. (mm)
Flare dimensions
øA 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)
B
Die
E
Copper pipe
F
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)
C
D
E
F
4.1. Precautions
(inch)
For devices that use R410A refrigerant
• Use ester oil, ether oil or 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 below. Make sure the insides of the pipes are clean
D
and do not contain any harmful contaminants such as sulfuric compounds,
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
hazards.
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 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 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 in-
sulation 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 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.
(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
ø19.05, 3/4
C Apply refrigerating machine oil over the entire flare seat surface.
D Use correct flare 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
A
B Liquid tubing
C Band 4
B
D Pipe cover 2
4.4. For twin combination
Refer to the outdoor unit installation manual.
in. (mm)
A024, 030, 036, 042
Flare nut O.D. Tightening torque
(mm, inch)
17, 43/64
22, 7/8
22, 7/8
26, 1-3/64
29, 1-9/64
29, 1-9/64
36, 1-27/64 100-120, 71-86
36, 1-27/64 100-120, 71-86
E Pipe cover 3
F Press the pipe cover against the sheet metal.
G Refrigerant tubing heat insulating material
(N-m, ft.lbs)
14-18, 10-13
34-42, 25-30
34-42, 25-30
49-61, 35-44
68-82, 49-59
68-82, 49-59
en
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