Table of Contents
Advertisement
5. Refrigerant piping work
A
SLZ-KF25, KF35: ø9.52
SLZ-KF50: ø12.7
SLZ-KF60: ø15.88
Fig. 5-1
b
a
90
Fig. 5-2
b
a
c
d
Fig. 5-3
Fig. 5-4
a
A
b
c
Fig. 5-5
a
b
B
d
c
Fig. 5-6
F
Fig. 5-7
A Indoor unit
B Outdoor unit
ø6.35
B
a Copper tubes
c
b Good
d
e
f
c No good
d Tilted
e Uneven
f Burred
a Burr
b Copper tube/pipe
c Spare reamer
d Pipe cutter
a
a Flare nut
b Copper tube
b
a Flaring tool
e
b Die
c Copper tube
b
d Flare nut
d
e Yoke
c
e
f
g
h
i
E
6
196
196
D
C
5.1. Refrigerant pipe (Fig. 5-1)
Piping preparation
• Refrigerant pipes of 3, 5, 7, 10 and 15 m are available as optional items.
(1) Table below shows the specifications of pipes commercially available.
Model
Pipe
For liquid
SLZ-KF25
SLZ-KF35
For gas
For liquid
SLZ-KF50
For gas
For liquid
SLZ-KF60
For gas
(2) Ensure that the 2 refrigerant pipes are well insulated to prevent condensation.
(3) Refrigerant pipe bending radius must be 100 mm or more.
Caution:
Using careful insulation of specified thickness. Excessive thickness prevents
storage behind the indoor unit and smaller thickness causes dew drippage.
5.2. Flaring work
• Main cause of gas leakage is defect in flaring work.
Carry out correct flaring work in the following procedure.
5.2.1. Pipe cutting (Fig. 5-2)
• Using a pipe cutter cut the copper tube correctly.
5.2.2. Burrs removal (Fig. 5-3)
• 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 remove burrs in
order to avoid burrs drop in the tubing.
5.2.3. Putting nut on (Fig. 5-4)
• Remove flare nuts attached to indoor and outdoor unit, then put them on pipe/tube
having completed burr removal.
(not possible to put them on after flaring work)
5.2.4. Flaring work (Fig. 5-5)
• Carry out flaring work using flaring tool as shown at the right.
Pipe diameter
(mm)
When the tool for R410A is used
6.35
9.52
12.7
15.88
Firmly hold copper tube in a die in the dimension shown in the table at above.
5.2.5. Check (Fig. 5-6)
• Compare the flared work with a figure in right side hand.
• If flare is noted to be defective, cut off the flared section and do flaring work
again.
a Smooth all around
b Inside is shining without any scratches
c Even length all around
d Too much
e Tilted
5.3. Refrigerant and drainage piping locations (Fig.5-7)
A Drain pipe
A
B Ceiling
C Grille
D Refrigerant pipe (liquid)
E Refrigerant pipe (gas)
F Main unit
Model
B
SLZ-KF25
SLZ-KF35
SLZ-KF50
SLZ-KF60
Outside diameter
Min. wall
Insulation
thickness
thickness
mm
inch
6.35
1/4
0.8 mm
8 mm
9.52
3/8
0.8 mm
8 mm
6.35
1/4
0.8 mm
8 mm
12.7
1/2
0.8 mm
8 mm
6.35
1/4
0.8 mm
8 mm
15.88
5/8
0.8 mm
8 mm
Dimension
A (mm)
Clutch type
0 - 0.5
0 - 0.5
0 - 0.5
0 - 0.5
f Scratch on flared plane
g Cracked
h Uneven
i Bad examples
Dimension
A (liquid)
B (gas)
63 mm
72 mm
63 mm
78 mm
Insulation
material
Heat resist-
ing foam
plastic 0.045
specific
gravity
+0
B
(mm)
-0.4
9.1
13.2
16.6
19.7
5
Advertisement
Table of Contents
