Installing The Refrigerant Piping; Precautions For Devices That Use R410A Refrigerant; Connecting Pipes - Mitsubishi Electric Mr. Slim PUHZ-RP200YHA2 Installationshandbuch

4. Installing the refrigerant piping
45° ± 2°
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
A Die
B Copper pipe
Fig. 4-2
A Flare cutting dimensions
B Flare nut tightening torque
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 Stop valve (gas-side)
B Seal section
C Local piping
D Double spanner section
E Joint pipe
F Pipe cover
Fig. 4-3
4.1. Precautions for devices that use R410A refrigerant
• Refer to page 3 for precautions not included below on using air condition-
ers 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 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.
Always apply no-oxidation brazing when brazing the pipes, otherwise, the
compressor will the damaged.
Warning:
When installing or moving the air conditioner, use only the specified refriger-
ant (R410A) to charge the refrigerant lines. Do not mix it with any other re-
frigerant 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.
Pipe size (mm) ø6.35 ø9.52 ø12.7 ø15.88 ø19.05 ø22.2 ø25.4 ø28.58
Thickness (mm) 0.8 0.8
• Do not use pipes thinner than those specified above.
• Use 1/2 H or H pipes if the diameter is 22.2 mm or larger.
• For the RP250, use 1/2 H or H pipes if the diameter is 19.05 mm or larger.
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. A (Fig. 4-1)
• Use two wrenches to tighten piping connections. B (Fig. 4-1)
• 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 (Fig. 4-1)
• Use the flare nuts for the following pipe size. D (Fig. 4-1)
INDOOR UNIT
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 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
3 Use the following procedure for connecting the gas-side piping. (Fig. 4-3)
1 Braze the E Joint pipe provided to the outdoor unit using locally procured braz-
ing materials and C Local piping without oxygen.
2 Connect the E 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.
Gas side Pipe size (mm)
Liquid side Pipe size (mm)
0.8 1.0 1.0 1.0 1.0
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-200 PEA-250 PEA-400 PEA-500
ø25.4 ø25.4 ø25.4
ø9.52 ø12.7 ø9.52
1.0
ø25.4
ø12.7