Mitsubishi Electric Mr.SLIM PUZ-ZM YKA2 Serie Manuel D'installation page 12

4. Installing the refrigerant piping
A
45°± 2 °
A Flare cutting dimensions
B Flare nut tightening torque
A (Fig. 4-1)
Copper pipe O.D.
en
(mm)
ø6.35
ø9.52
ø12.7
ø15.88
ø19.05
B (Fig. 4-1)
Copper pipe O.D.
(mm)
ø6.35
ø6.35
ø9.52
ø12.7
ø12.7
ø15.88
ø15.88
ø19.05
10
B
C
D
Fig. 4-1
Flare dimensions øA dimensions
(mm)
8.7 - 9.1
12.8 - 13.2
16.2 - 16.6
19.3 - 19.7
23.6 - 24.0
Flare nut O.D. 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
A Die
B Copper pipe
Fig. 4-2
A Stop valve
B Seal section
C Local piping
D Double spanner section
E Joint pipe
F Pipe cover
Fig. 4-3
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
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 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 (Ap-
plied on site).
• When usual pipe sealing is used, refer to Table 1 for flaring of R32 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 R32
(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 brazing
materials and C Local piping without oxygen.
2 Connect the E Joint pipe to the gas-side Stop valve.
Use 2 wrenches to tighten the flare nut.
* If order is reversed, refrigerant leak occurs because of the part damaging by
brazing fire.
• For PEA-M200, 250
The method of pipe connection is brazing connection.
Gas side Pipe size (mm)
Liquid side Pipe size (mm)
ZM200/M200 ZM250/M250
ø25.4 ø25.4
ø9.52 ø12.7
A (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-M200 PEA-M250
ø25.4 ø25.4
ø9.52 ø12.7