Installing The Refrigerant Piping - Mitsubishi Electric City Multi PCFY-P NKMU-E Serie Manual De Instalación

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) 41/64-21/32 (16.2 - 16.6)
5/8" (ø15.88) 49/64-25/32 (19.3 - 19.7)
3/4" (ø19.05)* 29/32-59/64 (22.9 - 23.3)
* Only for R22
B
Fig. 4-2
Copper pipe O.D. Flare tool for R22
1/4" (ø6.35) 3/64-1/16 (1.0 - 1.5)
3/8" (ø9.52) 3/64-1/16 (1.0 - 1.5)
1/2" (ø12.7) 3/64-1/16 (1.0 - 1.5)
5/8" (ø15.88) 3/64-1/16 (1.0 - 1.5)
3/4" (ø19.05) 3/64-1/16 (1.0 - 1.5)
B Refrigerant pipe sizes & Flare nut tightening torque
Liquid pipe
Pipe size Tightening
(mm) torque (N.m)
(inch) (ft.Ibs)
ODø6.35 14 - 18
P15
1/4" 10 - 13
ODø9.52 34 - 42
P24, P30
3/8" 25 - 30
ODø9.52 34 - 42
P36
3/8" 25 - 30
* Flare nut 3/4" (ø19.05) (purchased locally): Gas pipe of P36 (R22).
C Apply refrigerating machine oil over the entire flare seat surface.
D Use correct flare nuts meeting the pipe size of the outdoor unit.
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(inch)
in. (mm)
Flare dimensions
øA dimensions
11/32-23/64 (8.7 - 9.1)
1/2-33/64 (12.8 - 13.2)
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)
R22
Gas pipe
Pipe size Tightening
(mm) torque (N.m)
(inch) (ft.Ibs)
ODø12.7 49 - 61
1/2" 35 - 44
ODø15.88 68 - 82
5/8" 49 - 59
ODø19.05 68 - 82*
3/4" 49 - 59
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 thick-
nesses 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 sul-
furic compounds, 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 thick-
nesses 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 sul-
furic 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.
P15
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 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.
R410A
Liquid pipe
Pipe size Tightening Pipe size
(mm) torque (N.m) (mm)
(inch) (ft.Ibs) (inch)
ODø6.35 14 - 18 ODø12.7
1/4" 10 - 13 1/2"
ODø9.52 34 - 42 ODø15.88
3/8" 25 - 30 5/8"
ODø9.52 34 - 42 ODø15.88
3/8" 25 - 30 5/8"
P24, P30,P36
Flare nut O.D.
Gas pipe
Tightening Liquid pipe Gas pipe
torque (N.m) (mm)
(ft.Ibs) (inch)
49 - 61 17
35 - 44 11/16
68 - 82 22
49 - 59 7/8
68 - 82 22
49 - 59 7/8
in. (mm)
(mm)
(inch)
26
1
29
1-1/8
29
1-1/8
5