OUTDOOR UNIT
B-114
INST
ALLA
TION
PROCEDURE
S series
OUTDOOR
UNIT
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. 5-3)
• Using a pipe cutter cut the copper tube correctly.
5.2.2. Burrs removal (Fig. 5-4)
• 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. 5-5)
• 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. 5-6)
• 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
6.35
0 - 0.5
9.1
9.52
0 - 0.5
13.2
12.7
0 - 0.5
16.6
15.88
0 - 0.5
19.7
Firmly hold copper tube in a die in the dimension shown in the table at above.
Copper tubes
Good
No good
Tilted
Uneven
Burred
Fig. 5-3
Burr
Copper tube/pipe
Spare reamer
Pipe cutter
Fig. 5-5
Fig. 5-6
Flare nut
Copper tube
Flaring tool
Die
Copper tube
Flare nut
Yoke
5. Refrigerant piping work
5.1. Refrigerant pipe (Fig. 5-1)
Check that the difference between the heights of the indoor and outdoor
units, the length of refrigerant pipe, and the number of bends in the pipe are
within the limits shown below.
Models
(A) Pipe length
(B) Height
(C) Number of
(one way)
difference
bends (one way)
SUZ-KA25/KA35
max. 20 m
max. 12 m
max. of 10
SUZ-KA50/KA60/KA71
max. 30 m
max. 30 m
max. of 10
• Height difference limitations are binding regardless of which unit, indoor or outdoor,
is positioned higher.
• Refrigerant adjustment ... If pipe length exceeds 7 m, additional refrigerant (R410A)
charge is required.
(The outdoor unit is charged with refrigerant for pipe length up to 7 m.)
Up to 7 m
No additional charge is required.
Pipe length
Exceeding 7 m
Additional charge is required.
(Refer to the table below.)
SUZ-KA25/KA35 type 30 g
%
(refrigerant piping length (m) -5)
SUZ-KA50/KA60 type 20 g
%
(refrigerant piping length (m) -7)
SUZ-KA71 type 55 g
%
(refrigerant piping length (m) -7)
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
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
6.35
1/4
15.88
5/8
9.52
3/8
15.88
5/8
Model
SUZ-KA25
SUZ-KA35
SUZ-KA50
SUZ-KA60
SUZ-KA71
Insulation
material
Heat resisting
foam plastic
0.045 specific
gravity
Insulation
thickness
8 mm
8 mm
8 mm
8 mm
8 mm
8 mm
8 mm
8 mm
8 mm
8 mm
Indoor unit
Outdoor unit
Fig. 5-1
:
6.35
:
9.52
:
9.52
:
12.7
:
15.88
Fig. 5-2
/
0
1
2
/
0
/
0
1
2
3
/
0
1
2
3
4
/
/
/
/
0
0
0
0
0
1
1
1
1
2
2
2
3
3
4
Indoor unit
Outdoor unit
Min. wall
thickness
0.8 mm
0.8 mm
0.8 mm
0.8 mm
0.8 mm
0.8 mm
0.8 mm
0.8 mm
0.8 mm
1.0 mm
+0
-0.4
Refrigerant to be
added
A
Fig. 5-4
(C)
(B)
(A)
90°
