B-29
INST
ALLA
TION PROCEDURE
600
o
600
CEILING
CASSETTE
CEILING CASSETTE
S series
:
6.35
90
A
7
A
B
5. Refrigerant piping work
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.
(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.
Pipe
For liquid
For gas
For liquid
For gas
For liquid
For gas
Outside diameter
mm
inch
6.35
1/4
9.52
3/8
6.35
1/4
9.52
3/8
6.35
1/4
12.7
1/2
Model
SLZ-KA25
SLZ-KA35
SLZ-KA50
Insulation
material
Heat resisting
foam plastic
0.045 specific
gravity
Insulation
thickness
8 mm
8 mm
8 mm
8 mm
8 mm
8 mm
SLZ-KA25, KA35:
:
9.52
SLZ-KA50:
:
12.7
Fig. 5-1
Min. wall
thickness
0.8 mm
0.8 mm
0.8 mm
0.8 mm
0.8 mm
0.8 mm
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.
Dimension
Pipe diameter
A (mm)
(mm)
When the tool for R410A is used
B (mm)
Clutch type
Smooth all around
6.35
0 - 0.5
9.1
9.52
0 - 0.5
13.2
12.7
0 - 0.5
16.6
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.
5.3. Refrigerant and drainage piping locations (Fig.5-7)
Drain pipe
Ceiling
Grille
Refrigerant pipe (liquid)
Refrigerant pipe (gas)
Indoor unit
Outdoor unit
Water supply inlet
Main unit
Good
No good
Copper tube
Tilted
Uneven
Burred
Fig. 5-2
Fig. 5-3
Burr
Copper tube/pipe
Spare reamer
Pipe cutter
Fig. 5-4
Fig. 5-5
Fig. 5-6
Fig. 5-7
Flare nut
Copper tube
Flaring tool
Die
Copper tube
Flare nut
Yoke
Inside is shining without any scratche
Even length all aroun
Too much
Tilte
Scratch on flared plane
Cracked
Uneven
Bad examples
As viewed from A
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