Mitsubishi Electric MXZ-8A140VA Manuel D'installation page 8

5. Installing the refrigerant piping
A
45°±2°
A Flare cutting dimensions
B Flare nut tightening torque
Fig. 5-4
A (Fig. 5-4)
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. 5-4)
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. 5-5
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
Refrigerant collection when relocating the indoor and outdoor units
(pump down)
1 Connect a gauge manifold valve (pressure gauge included) to the service
port near the gas stop valve of the outdoor unit so that the refrigerant pres-
sure can be measured.
2 Turn on the power supply (circuit breaker).
3 Close the liquid stop valve, and then perform the test run for cooling opera-
tion (SW4-1: ON and SW4-2: OFF).
* Be sure to wait at least 3 minutes after turning on the power supply before
setting SW4-1 and SW4-2. If the DIP switches are set before 3 minutes has
elapsed, the test run may not start.
4 Fully close the gas stop valve when the pressure reading on the gauge drops
to 0.05 - 0.00 MPa* (approximately 0.5 - 0.0 kgf/cm
* If too much refrigerant has been added to the air conditioner system, the
pressure may not drop to 0.5 kgf/cm
lecting device to collect all of the refrigerant in the system, and then re-
charge the system with the correct amount of refrigerant after the indoor
and outdoor units have been relocated.
5 Stop the air conditioner operation (SW4-1: OFF and SW4-2: OFF).
6 Turn off the power supply (circuit breaker).
5.5. Connecting pipes (Fig. 5-4)
• 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. 5-5)
Copper pipe O.D.
(mm)
ø6.35 (1/4")
ø9.52 (3/8")
ø12.7 (1/2")
ø15.88 (5/8")
2 ).
2
. If this occurs, use a refrigerant col-
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