Mitsubishi Electric MXZ-8B48NA Manual De Instalación página 8

5. Installing the refrigerant piping
© ©
@ Liquid pipe
(_ Gas pipe
@ Insulation
@ Taping
Fig. 5-4
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\/ "I;o
®
@ Flare cutting dimensions
® Flare nut tightening torque
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®
Fig. 5-5
@ (Fig. 5-5)
Copper pipe O.D.
(mm) (inch)
_6.35 (1/4)
_9.52 (3/8)
_12.7 (1/2)
_15.88 (5/8)
Flare dimensions
_A dimensions (mm) (inch)
8.7 - 9.1 (5/16 - 3/8)
12.8- 13.2 (1/2)
16,2- 16.6 (5/8)
19,3- 19.7 (3/4)
Copper pipe O.D. Flare nut O.D.
(mm) (inch) (mm) (inch)
o6.35 (1/4) 17 (11/16)
o6.35 (1/4) 22 (7/8)
o9.52 (3/8) 22 (7/8)
o9.52 (3/8) 26 (1-1/4)
o12.7 (1/2) 26 (1-1/4)
o12.7 (1/2) 29 (1-1/8)
o15.88 (5/8) 29 (1-1/8)
o15.88 (5/8) 36 (1-7/16)
Tightening torque
(N.m)* (ft.ib)
14- 18 (10- 13)
34- 42 (25- 30)
34- 42 (25- 30)
49- 61 (35-44)
49- 61 (35-44)
68- 82 (49- 59)
68- 82 (49- 59)
100- 120 (71 -87)
* 1 N.m _ 10 kgf.cm
A
/
®
Fig. 5-6
@ Die
® Copper pipe
8
Refrigerant collection when relocating the indoor and outdoor
units (pump down)
_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 pressure can
be measured.
@Turn on the power supply (circuit breaker).
®Close the liquid stop valve, and then perform the test run for cooling operation
(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.
_Fuliy close the gas stop valve when the pressure reading on the gauge drops
to 0.05 - 0.00 MPa* (7.3-0 PSIG) (approximately 0.5 - 0.0 kgf/cm2).
* If too much refrigerant has been added to the air conditioner system, the
pressure may not drop to 0.5 kgf/cm 2. If this occurs, use a refrigerant collect-
ing device to collect all of the refrigerant in the system, and then recharge
the system with the correct amount of refrigerant after the indoor and outdoor
units have been relocated.
@Stop the air conditioner operation (SW4-1: OFF and SW4-2: OFF).
Turn off the power supply (circuit breaker).
Z_Warning:
When pumping down the refrigerant, stop the compressor before disconnect-
ing the refrigerant pipes. The compressor may burst if air etc. get into it.
5.5. Connecting pipes (Fig. 5-4) (Fig. 5-5)
When commercially available copper pipes are used, insulate both the liquid and
gas pipes separately with commercially available insulation materials (heat-resis-
tant to 100 °C, 212 OF or more, thickness of 12 mm, 1/2 inch or more). (Fig. 5-4)
• The indoor parts of the drain pipe should be wrapped with polyethylene foam in-
sulation materials (specific gravity of 0.03, thickness of 9 mm (3/8 inch) or more).
[Fig. 5-5]
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tighten-
ing flare nut. @
• Use two 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 as follows. ®
Z_Warning:
When installing the unit, securely connect the refrigerant pipes before start-
ing the compressor.
• Pipe size (Outdoor unit-Branch box)
Pipe size Liquid _9.52 (3/6)
_rnm) nch Gas _15.88(5/8)
• Pipe size (Branch box-Indoor unit) *Case of M series or S series Indoor unit
Indoor (BTU/h) 06 09 12 15 18 24
unit type
_a6.35 _6.35 _6.35 _6.35 _a6.35 _a9.52
Pipe size Liquid
(1/4) (1/4) (1/4) (1/4) (1/4) (3/8)
0amm) _a9.52 _9.52 _9.52 _12.7 _a12.7 _a15.88
(inch) Gas
(3/8) (3/8) (3/8) (1/2) (1/2) (5/8)
• Pipe size (Branch box-Indoor unit) *Case of P series indoor unit
Indoor unit type (BTU/h) 18 24 30
Pipe size Liquid o6.35 (1/4) _9.52 (3/8) _9.52 (3/6)
(omm) (inch) Gas o12.7 (1/2) _15.88 (5/6) _15.88 (5/6)
• When bending the pipes, be careful not to break them. Bend radii of 100 mm (4
inch) to 150 mm (6 inch) are sufficient.
• Make sure the pipes do not contact the compressor. Abnormal noise or vibration
may result.
d) 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 2 for flaring of R410A refrigerant
pipes.
The size adjustment gauge can be used to confirm A measurements.
Table 2 (Fig. 8-6) mm (inch)
A
Copper pipe O.D.
_a6.35 (1/4)
_a9.52 (3/8)
_a12.7 (1/2)
_a15.88 (5/8)
Flare tool for R410A Flare tool for R22.R407C
Clutch type
0- 0.5 (0-1/64) 1.0-1.5 (3/64-1/16)
0- 0.5 (0-1/64) 1.0-1.5 (3/64-1/16)
0- 0.5 (0-1/64) 1.0-1.5 (3/64-1/16)
0- 0.5 (0-1/64) 1.0-1.5 (3/64-1/16)