Installing The Refrigerant Piping - Mitsubishi Electric PUHZ-P200 Installation Manual

4. Installing the refrigerant piping

45 2
Flare cutting dimensions
Flare nut tightening torque
Fig. 4-1
(Fig. 4-1)
Copper pipe O.D. Flare dimensions
(mm) øA dimensions (mm)
ø6.35 8.7 - 9.1
ø9.52 12.8 - 13.2
ø12.7 16.2 - 16.6
ø15.88 19.3 - 19.7
ø19.05 23.6 - 24.0
(Fig. 4-1)
Copper pipe O.D. Flare nut O.D.
(mm) (mm)
ø6.35 17
ø6.35 22
ø9.52 22
ø12.7 26
ø12.7 29
ø15.88 29
ø15.88 36
ø19.05 36
B
Die
Copper pipe
Fig. 4-2
Tightening torque
(N·m)
14 - 18
34 - 42
34 - 42
49 - 61
68 - 82
68 - 82
100 - 120
100 - 120
Stop valve (gas-side)
Seal section
Local piping
Double spanner section
Joint pipe
Pipe cover
Fig. 4-3
4.1. Precautions for devices that use R410A refriger-
ant
• Refer to 1.5. 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 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 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.
Always apply no-oxidation brazing when brazing the pipes, otherwise, the
compressor will the damaged.
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.
Pipe size (mm) ø6.35 ø9.52 ø12.7 ø15.88 ø19.05 ø22.2
Thickness (mm) 0.8 0.8
• Do not use pipes thinner than those specified above.
4.2. Connecting pipes
• 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
insulation 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. (Fig.4-1)
• Use 2 wrenches to tighten piping connections.
• 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.
• Use the flare nuts for the following pipe size.
Gas side Pipe size (mm)
Liquid side Pipe size (mm)
• When bending the pipes, be careful not to break them. Bend radius of 100 mm
to 150 mm are sufficient.
• Make sure the pipes do not contact the compressor. Abnormal noise or vibration
may result.
Pipes must be connected starting from the indoor unit.
Flare nuts must be tightened with a torque wrench.
Flare the liquid pipes and gas pipes and apply a thin layer of refrigeration oil (Ap-
plied 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 B measurements.
Table 1 (Fig. 4-2)
Copper pipe O.D.
Flare tool for R410A
(mm)
ø6.35 (1/4") 0 - 0.5
ø9.52 (3/8") 0 - 0.5
ø12.7 (1/2") 0 - 0.5
ø15.88 (5/8") 0 - 0.5
ø19.05 (3/4") 0 - 0.5
Use the following procedure for connecting the gas-side piping. (Fig. 4-3)
1 Braze the Joint pipe provided to the outdoor unit using locally procured braz-
ing materials and Local piping without oxygen.
2 Connect the Joint pipe to the gas-side Stop valve.
Use two wrenches to tighten the flare nut.
* If order is reversed, refrigerant leak occurs because of the part damaging by
brazing fire.
• For PEA-RP200, 250, 400, 500GA
The method of pipe connection is brazing connection.
PEA-200
Gas side Pipe size (mm)
Liquid side Pipe size (mm) ø9.52
ø25.4 ø28.58
0.8 1.0 1.0 1.0 1.0
(Fig.4-1)
(Fig.4-1)
(Fig.4-1)
RP50 RP60,71 RP100-140
ø12.7 ø15.88 ø15.88
ø6.35 ø9.52 ø9.52
B (mm)
Flare tool for R22·R407C
Clutch type
1.0 - 1.5
1.0 - 1.5
1.0 - 1.5
1.0 - 1.5
1.0 - 1.5
PEA-250 PEA-400 PEA-500
ø25.4 (or ø28.58)
ø12.7 ø9.52
1.0
ø12.7
5