11
Burrs removal
- Completely remove all burrs from the cut cross section of pipe/tube.
- Put the end of the copper tube/pipe to downward direction as you re-
move burrs in order to avoid to let burrs drop in the tubing.
Flaring work
- Carry out flaring work using flaring tool as shown below.
Firmly hold copper tube in a bar(or die) as indicated dimension in the
table above.
Check
- Compare the flared work with figure below.
- If flare is noted to be defective, cut off the flared section and do flar-
ing work again.
E
N
G
L
IS
H
Indoor unit
[kW(Btu/h]
Pipe
" A "
Gas
Liquid
Gas
Liquid
<5.6(19,100)
1/2"
1/4"
0.5~0.8
0~0.5
<16.0(54,600)
5/8"
3/8"
0.8~1.0
0.5~0.8
<22.4(76,400)
3/4"
3/8"
1.0~1.3
0.5~0.8
Copper
tube
90°
Slanted Uneven Rough
Pipe
Reamer
Point down
Flare nut
Copper tube
Bar
Copper pipe
Clamp handle
Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Inclined
Inside is shining without scratches.
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
Copper
tube
90°
Slanted Uneven Rough
Pipe
Reamer
Point down
Flare nut
Copper tube
Bar
Copper pipe
Clamp handle
Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Inclined
Inside is shining without scratches.
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
Flare shape and flare nut tightening torque
Opening shutoff valve
Precautions when connecting pipes
- See the following table for flare part machining dimensions.
- When connecting the flare nuts, apply refrigerant oil to the inside and
outside of the flares and turn them three or four times at first. (Use
ester oil or ether oil.)
- See the following table for tightening torque.(Applying too much torque may
cause the flares to crack.)
- After all the piping has been connected, use nitrogen to perform a
gas leak check.
1
Remove the cap and turn the valve counter clockwise with the
hexagon wrench.
2
Turn it until the shaft stops.
Do not apply excessive force to the shutoff valve. Doing so may
break the valve body, as the valve is not a backseat type. Always
use the special tool.
3
Make sure to tighten the cap securely.
Pipe size
Tightening
torque(N·m)
A(mm)
Flare shape
Ø9.52
38±4
12.8-13.2
90°
±2
45
°
±2
A
R=0.4~0.8
Ø12.7
55±6
16.2-16.6
Ø15.88
75±7
19.3-19.7
CAUTION
• Always use a charge hose for service port connection.
• After tightening the cap, check that no refrigerant leaks are present.
• When loosening a flare nut, always use two wrenches in
combination, When connecting the piping,
always use a spanner and torque wrench
in combination to tighten the flare nut.
• When connecting a flare nut, coat the
flare(inner and outer faces) with oil for
R410A(PVE) and hand tighten the nut
3 to 4 turns as the initial tightening.
Outdoor
unit
Liquid side
Flare connection
Flare connection
Gas side
Indoor
unit
Union
!
Insulation of shutoff valve
1
Use the heat insulation material for the refrigerant piping which has
an excellent heat-resistance (over 120 °C).
2
Precautions in high humidity circumstance:
This air conditioner has been tested according to the "ISO Condi-
tions with Mist" and confirmed that there is not any default. How-
ever, if it is operated for a long time in high humid atmosphere
(dew point temperature: more than 23 °C), water drops are liable to
fall. In this case, add heat insulation material according to the fol-
lowing procedure:
- Heat insulation material to be prepared... EPDM (Ethylene Propy-
lene Diene Methylene)-over 120 °C the heat-resistance tempera-
ture.
- Add the insulation over 10 mm thickness at high humidity environ-
ment.
Indoor unit
Thermal insulator
(accessory)
Fastening band
(accessory)
Refrigerant piping
Closing shutoff valve
1
Remove the cap and turn the valve clockwise with the hexagon
wrench.
2
Securely tighten the valve until the shaft contacts the main body seal.
3
Make sure to tighten the cap securely.
* For the tightening torque, refer to the table on the below.
Tightening torque
Shutoff
valve
size
Tightening torque N·m(Turn clockwise to close)
Shaft(valve body) Cap(Valve
lid)
Service
port
Flare
nut
Gas line piping at-
tached to unit
Ø 6.35
6 ± 0.6 Hexagonal
wrench 4
mm
29.4 ± 2.9
12.7±2
16 ± 2
-
Ø 9.52
38 ± 4
Ø 12.7 9 ± 0.9
53.9 ± 5.8
55 ± 6
Ø 15.88 15 ± 1.5
Hexagonal
wrench 6
mm
75 ± 7
Ø 22.2
30 ± 3
Hexagonal
wrench 10
mm
-
25 ± 3
Ø 25.4
Summary of Contents for MULTI V IV PRO ARUN080LLS4
Page 37: ......
