Flaring Work; Pipe Connection - Mitsubishi Electric MXZ-3A30NA Installation Manual

3-1. FLARING WORK
4) Cut the copper pipe correctly with pipe cutter. (Fig. 7, 2)
2) Completely remove ail 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 90;- pn ee x
remove burrs in order to avoid to let burrs drop in the piping. (Ke pipe {
3) Remove flare nuts attached to indoor and outdoor units, then put them < fA A fA
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 . .
shown in the table. Select A mm from the table according to the tool Fig. 4 Fig. 2
5) Check. Flaring tool
* Compare the flared work with Fig. 6. Burr Copper pipe ~
. . : 4 Spare reamer iS cE
+ If flare is noted to be defective, cut off the flared section and do :
"
.
1 )
> 72 Pipe cutter E s
\
flaring work again. | |
Clutch type Wing nut type
Fig. 3 Fig. 4
A Inside is shin-
Smooth all ing without any
around scratches.
QTY
; / —-—- Copper pipe Bid \
Die ~ Even length
Fi ' all around
are nut
Fig. 5 Fig. 6
Pipe diameter Nut
A [mm (inch)}
Tightening torque
; Clutch type tool Clutch type tool Wing nut type tool
ch "| . .
[mm (inch)] (mm) for R410A for R22 for R22 Nem kgfecm ftlb
@6.35 (1/4) 17 1.5 to 2.0 13.7 to 17.7 | 140 to 180 10 to 13
@9.52 (3/8) 22 0100.5 1.0 to 1.5 (0.06 to 0.08) 34.3 to 41.2 | 350 to 420 | 25 to 30
@12.7 (1/2) 26 (0. to 0.02) (0.04 to 0.06) 201025 49.0 to 56.4 | 500 to 575 36 to 42
@15.88 (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.
3-3. INSULATION AND TAPING
4) 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.