Indoor/Outdoor Units Connection Finishing And - Mitsubishi Electric MXZ-2A40VA Manual De Instrucciones

5. INDOOR/OUTDOOR UNITS CONNECTION FINISHING AND TEST RUN
5-1 FLARED CONNECTIONS
PIPE LENGTH AND HEIGHT DIFFERENCE
Limits 2A40VA
Pipe length per indoor unit 20 m max.
Total pipe length for multi-system 30 m max.
Height difference* 15 m max.
No. of bends per indoor unit 20 max.
Total No. of bends for multi-system 30 max.
* If the outdoor unit is installed higher than the indoor unit, max. height difference is reduced to 10 m.
Refrigerant adjustment ....... If pipe length exceeds 20 m, additional refrigerant (R410A) charge is required.
(The outdoor unit is charged with refrigerant for total pipe length up to 20 m.)
Up to 20 m
Pipe length
Exceeding 20 m
20 g/m × (refrigerant piping length(m)-20)
Refrigerant to be added
Indoor unit
Indoor unit
• For pipe size, see the table below.
SELECTING PIPE SIZE
The diameter of connection pipes differs according to the type and capacity of indoor units. Match the diameters
of connection pipes for indoor and outdoor units according to the following table.
Model Allowable
Pipe size for indoor unit
name connection pipe size
22
Liquid pipe ø6.35 mm ø6.35 mm
25
Gas pipe ø9.52 mm ø9.52 mm
35
2A52VA
20 m max.
30 m max.
15 m max.
20 max.
30 max.
No additional charge is required.
Additional charge is required.
(Refer to the table below.)
ı UNIT
Outdoor
unit
Å UNIT
MXZ-2A40VA MXZ-2A52VA
Valve size for outdoor unit
Liquid pipe
Å UNIT
Gas pipe
Liquid pipe
ı UNIT
Gas pipe
PIPING PREPARATION
1 If you use commercially available copper pipes, use the following table for pipe specifications.
Outside diameter
Liquid pipe
Gas pipe
2 For insulation material, use 8 mm-thick heat-insulating expended polyethylene with a specific gravity of
0.045.
3 Ensure that the 2 refrigerant pipes are insulated to prevent condensation.
4 Refrigerant pipe bending radius must be 100 mm or more.
CAUTION:
Be sure to use the insulation of specified thickness. Excessive thickness may cause incorrect installa-
tion of the indoor unit and lack of thickness may cause dew drippage.
5-2 FLARING WORK
• Main cause of gas leakage is defect in flaring work.
Perform flaring work correctly in the following procedure.
1. Pipe cutting
• Cut the copper pipe correctly with pipe cutter.
2. Burrs removal
• Completely remove all burrs from the cut cross
section of the pipe.
• Put the end of the copper pipe downward to pre-
vent burrs from dropping in the pipe.
3. Putting nut on
• Remove flare nuts attached to indoor and outdoor
units, then put them on pipe having completed
burr removal.
ø6.35 mm (not possible to put them on after flaring work)
ø9.52 mm • Flare nut for R410A pipe may differ from R22 pipe
ø6.35 mm depending on the diameter of pipe.
ø9.52 mm
5
Wall thickness
ø6.35 mm 0.8 mm
ø9.52 mm 0.8 mm
Copper
pipe
No good
Good
Tilted Uneven Burred
90°
Copper pipe
Burr
Spare
reamer
Pipe cutter
Flare nut
Copper pipe