Flaring Work And Pipe Connection - Mitsubishi Electric MXZ-2B20NA Installation Manual

3. FLARING WORK AND PIPE CONNECTION
3-1. FLARING WORK
1) Cut the copper pipe correctly with pipe cutter. (Fig. 1, 2)
2) Completely remove all burrs from the cut cross section of pipe. (Fig. 3) Good No good
* Put the end of the copper pipe to downward direction as you Copper 907 ps Levene .
remove burrs in order to avoid to let burrs drop in the piping. (Se
3) Remove flare nuts attached to indoor and outdoor units, then put them
on pipe having completed burr removal. (Not possible to put them on
after flaring work.) Tilted Uneven Burred
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension Fig. 4 Fig. 2
shown in the table. Select A mm from the table according to the tool
you use. Flaring tool
5) Check a Copper pipe S
* Compare the flared work with Fig. 6. Burr Spare reamer DO
¢ If flare is noted to be defective, cut off the flared section and do [| 0 he cutter & [| és
flaring work again. | |
Clutch type Wing nut type
Fig. 3 Fig. 4
A inside is shin-
Smooth all ing without any
around \ scratches.
. ae
, Lt" Copper pipe ' ,
Die "S\ Even length
* all around
Flare nut
Fig. 5 Fig. 6
A inch Tightening t
Pipe diameter Nut [mm (inch)] ightening torque
[mm (inch)] (mm) Clutch type tool Clutch type tool Wing nut type tool Nem kgfeem ftlb
for R410A for R22 for R22
26.35 (1/4) 17 1.51020 13.7 to 17.7} 140 to 180 10to 13
29.52 (3/8) 22 0to0.5 1.0 to 1.5 (0.06 to 0.08) 34.3 to. 41.2} 350 to 420 | 25 to 30
912.7 (4/2) 26 (0. to 0.02) (0.04 to 0.06) 2.0 to 2.5 49.0 to 56.4] 500 t0 575 | 36 to 42
215.88 (5/8) 29 (0.08 to 1.0) 73.5 to 78.4} 750 to 800 | 54 to 58
3-2. PIPE CONNECTION
¢ Fasten flare nut with a torque wrench as specified in the table.
¢ When fastened too tight, flare nut may brake after a long period and
cause refrigerant leakage.
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit in the same
manner applied for indoor unit.
* For tightening, use a torque wrench or spanner and use the same
tightening torque applied for indoor unit.
Ve PGCE
When installing the unit, securely connect the refrigerant
pipes before starting the compressor.
3-3. INSULATION AND TAPING
1) Cover piping joints with pipe cover.
2) For outdoor unit side, surely insulate every piping including valves.
3) Using piping tape (E), apply taping starting from the entry of outdoor
unit.
* Stop the end of piping tape (E) with tape (with adhesive agent at-
tached).
¢ When piping have to be arranged through above ceiling, closet or
where the temperature and humidity are high, wind additional com-
mercially sold insulation to prevent condensation.