Installing The Refrigerant Piping; Precautions For Devices That Use R410A Refrigerant - Mitsubishi Electric Mr.SLIM PUHZ-RP HA2 Serie Manuel D'installation

4. Installing the refrigerant piping

45°±2°
(A) Flare cutting dimensions
(B) Flare nut tightening torque
Fig. 4-1
(A) (Fig. 4-1)
Copper pipe O.D. Flare dimensions
(mm) øA dimensions (mm)
ø6.35
ø9.52 12.8 - 13.2
ø12.7 16.2 - 16.6
ø15.88 19.3 - 19.7
ø19.05 23.6 - 24.0
(B) (Fig. 4-1)
Copper pipe O.D. Flare nut O.D.
(mm)
ø6.35
ø6.35
ø9.52
ø12.7
ø12.7
ø15.88
ø15.88
ø19.05
Fig. 4-2
8.7 - 9.1
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
(A) Die
(B) Copper pipe

4.1. Precautions for devices that use R410A refrigerant

• Refer to page 3 for precautions not included below on using air conditioners
with R410A refrigerant.
• Use ester oil, ether oil, alkylbenzene oil (small amount) as the refrigeration
oil applied to the flared sections.
• Use C10 copper phosphorus, for copper and copper alloy seamless pipes,
to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses
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 sulfuric compounds,
oxidants, debris, or dust.
Warning:
When installing or moving 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. Air enclosed in the lines can cause
pressure peaks resulting in a rupture and other hazards.
RP35, 50
Liquid pipe ø6.35 thickness 0.8 mm
Gas pipe ø12.7 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 insula-
tion 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 tightening
flare nut. (A)
• Use two wrenches to tighten piping connections. (B)
• Use leak detector or soapy water to check for gas leaks after connections are
completed.
• Apply refrigerating machine oil over the entire flare seat surface. (C)
• Use the flare nuts for the following pipe size. (D)
Gas side Pipe size (mm)
Liquid side Pipe size (mm)
• When bending the pipes, be careful not to break them. Bend radii of 100 mm to 150
mm are sufficient.
• Make sure the pipes do not contact the compressor. Abnormal noise or vibration
may result.
(1) Pipes must be connected starting from the indoor unit.
Flare nuts must be tightened with a torque wrench.
(2) Flare the liquid pipes and gas pipes and apply a thin layer of refrigeration oil
(Applied on site).
• When usual pipe sealing is used, refer to Table 1 for flaring of R410A refrigerant
pipes.
The size adjustment gauge can be used to confirm A measurements.
Table 1 (Fig. 4-2)
Copper pipe O.D.
Flare tool for R410A
(mm)
ø6.35 (1/4") 1.0 - 1.5
ø9.52 (3/8") 1.0 - 1.5
ø12.7 (1/2") 1.0 - 1.5
ø15.88 (5/8") 1.0 - 1.5
ø19.05 (3/4") 1.0 - 1.5
RP60-140
ø9.52 thickness 0.8 mm
ø15.88 thickness 1.0 mm
RP35, 50 RP60, 71 RP100-140
ø12.7 ø15.88 ø15.88
ø6.35 ø9.52 ø9.52
A (mm)
Flare tool for R22·R407C
Clutch type
0 - 0.5
0 - 0.5
0 - 0.5
0 - 0.5
0 - 0.5
5