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Indoor Unit Installation
4
Carry out flaring work using flaring tool as shown below.
Clutch type
<Flaring tool>
A
Die
Copper pipe
Outer
Flare tool for
diameter
R410A clutch type
Ø1/4 inch
0~0.02 (0~0.5)
(6.35 mm)
Ø3/8 inch
0~0.02 (0~0.5)
(9.52 mm)
Ø1/2 inch
0~0.02 (0~0.5)
(12.70 mm)
Ø5/8 inch
0~0.02 (0~0.5)
(15.88 mm)
5
Check if you flared the pipe correctly. There are some
examples of incorrectly flared pipes below.
Inclined
Damaged
Surface
8
English
Wing nut type
York
Die
Flare nut
Copper pipe
(Unit: inch (mm))
A
Conventional flare tool
Clutch type Wing nut type
0.04~0.06
0.06~0.08
(1.0~1.5)
(1.5~2.0)
0.04~0.06
0.06~0.08
(1.0~1.5)
(1.5~2.0)
0.04~0.06
0.06~0.08
(1.0~1.5)
(1.5~2.0)
0.04~0.06
0.06~0.08
(1.0~1.5)
(1.5~2.0)
Cracked
Uneven
Thickness
6
Align the pipes and tighten the flare nuts first manually
and then with a torque wrench, applying the following
torque.
L
Connection Torque
Outer diameter,
D (inch (mm))
kgf•cm (lbf•ft (N•m))
Ø1/4 inch
10.3 to 13.3
140~180
(6.35 mm)
(14 to 18)
Ø3/8 inch
25.1 to 31.0
350~430
(9.52 mm)
(34 to 42)
Ø1/2 inch
36.1 to 45.0
500~620
(12.70 mm)
(49 to 61)
Ø5/8 inch
50.2 to 60.5
690~830
(15.88 mm)
(68 to 82)
CAUTION
•
In case of needing brazing, you must work with
nitrogen gas blowing.
Step 7 Connecting the refrigerant pipes
Connect indoor and outdoor units with field-supplied copper
pipes by means of flare connections. Use insulated seamless
refrigeration grade pipe only, (Cu DHP type according to
ISO1337), degreased and deoxidized, suitable for operating
pressures of at least 4200 kPa and for burst pressure of at
least 20700 kPa. Under no circumstances must sanitary type
copper pipe be used.
IMPORTANT
•
When installing the unit, always connect the
refrigerant pipes first, followed by the electrical cables.
For disassembly, always disassemble the electric cables
before the refrigerant pipes.
R 0.016 to 0.031 inch
(R 0.4 to 0.8 mm)
D
Flare dimension, L
(inch(mm))
0.34 to 0.36
(8.7 to 9.1)
0.50 to 0.52
(12.8 to 13.2)
0.64 to 0.65
(16.2 to 16.6)
0.76 to 0.78
(19.3 to 19.7)
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