Mitsubishi Electric MXZ-8A140VA Installationshandbuch Seite 8

5. Installing the refrigerant piping
A
45°±2°
A Flare cutting dimensions
B Flare nut tightening torque
Fig. 5-8
A (Fig. 5-8)
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
B (Fig. 5-8)
Copper pipe O.D. Flare nut O.D.
(mm)
ø6.35
ø6.35
ø9.52
ø9.52
ø12.7
ø12.7
ø15.88
ø15.88
A
Fig. 5-9
D
A Front piping cover
B Piping cover
C Stop valve
D Service panel
E Band radius : 100 mm-150 mm
Fig. 5-10
8
B
C
D
8.7 - 9.1
Tightening torque
(mm) (N·m)*
17 14 - 18
22 34 - 42
22 34 - 42
26 49 - 61
26 49 - 61
29 68 - 82
29 68 - 82
36 100 - 120
* 1 N·m
A
A Die
B Copper pipe
B
C
B
A E
5.5. Connecting pipes (Fig. 5-8)
• 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 insu-
lation 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 com-
pleted.
• Apply refrigerating machine oil over the entire flare seat surface. C
• Use the flare nuts as follows. D
IPipe size (Outdoor unit-Branch box)
Pipe size Liquid
(ømm) Gas
IPipe size (Branch box-Indoor unit) *Case of M series or S series Indoor unit
Indoor unit
(kW)
type
Pipe size Liquid
(ømm) Gas
* When using 60 type indoor unit of MEXZ series, use the flare nut in the
indoor unit accessory for the gas side connecting of indoor unit.
Do not use the flare nut (gas side) attached to the indoor unit. If it is used,
a gas leakage or even a pipe extraction may occur.
IPipe size (Branch box-Indoor unit) *Case of P series indoor unit
Indoor unit
(kW)
type
Pipe size Liquid
(ømm) Gas
When using 35, 50 type indoor unit of P series, use the flare nut attached to
the indoor unit.
Do not use the flare nut (in the indoor unit accessory). If it is used, a gas
leakage or even a pipe extraction may occur.
• When bending the pipes, be careful not to break them. Bend radii of 100 mm to 150
10 kgf·cm
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 2 for flaring of R410A refrigerant
pipes.
The size adjustment gauge can be used to confirm A measurements.
Table 2 (Fig. 5-9)
Copper pipe O.D.
(mm)
ø6.35 (1/4")
ø9.52 (3/8")
ø12.7 (1/2")
ø15.88 (5/8")
5.6. Refrigerant piping (Fig. 5-10)
Remove the service panel D (three screws) and the front piping cover A (two screws)
and rear piping cover B (two screws).
Refrigerant pipes are protectively wrapped
• The pipes can be protectively wrapped up to a diameter of ø90 before or after
connecting the pipes. Cut out the knockout in the pipe cover following the groove
and wrap the pipes.
Pipe inlet gap
• Use putty or sealant to seal the pipe inlet around the pipes so that no gaps remain.
(If the gaps are not closed, noise may be emitted or water and dust will enter the
unit and breakdown may result.)
ø9.52
The lineup of a connectable indoor unit
ø15.88
depends on a district/areas/country.
22 25 35 50 60
ø6.35 ø6.35 ø6.35 ø6.35 ø6.35
ø9.52 ø9.52 ø9.52 ø12.7 ø15.88 * ø15.88 ø15.88
35 50 60 71
ø6.35 ø6.35 ø9.52 ø9.52
ø12.7 ø12.7 ø15.88 ø15.88
A (mm)
Flare tool for R410A Flare tool for R22·R407C
Clutch type
0 - 0.5
0 - 0.5
0 - 0.5
0 - 0.5
71 80
ø9.52 ø9.52
1.0 - 1.5
1.0 - 1.5
1.0 - 1.5
1.0 - 1.5