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3
INSTALL THE REFRIGERANT PIPE
All field piping must be provided by a licensed refrigeration
technician and must comply with the relevant local and
national codes.
Precautions
Execute heat insulation work completely on both sides of the
gas piping and liquid piping. Otherwise, this can sometimes
result in water leakage.
(When using a heat pump, the temperature of the gas piping can
reach up to approximately 120
sufficiently resistant.)
Also, in cases where the temperature and humidity of the
refrigerant piping sections might exceed 30 /86 F or Rh80%,
reinforce the refrigerant insulation(20mm/0.8in or thicker).
Condensation may form on the surface of the insulating material.
Before rigging tubes, check which type of refrigerant is used.
Use a pipe cutter and flare suitable for used refrigerant.
Only use annealed material for flare connections.
Do not mix anything other than the specified refrigerant, such
as air, etc.., nside the refrigerant circuit.
i
If the refrigerant gas leaks during the work, ventilate the area.
A toxic gas is emitted by the refrigerant gas being exposed to
a fire.
Make sure there is no refrigerant gas leak. A toxic gas may be
released by the refrigerant gas leaking indoor and being
exposed to flames from an area heater, cooking stove, etc.
Refer to the table below for the dimensions of flare nuts spaces
and the appropriate tightening torque. (Overtightening may
damage the flare and cause leaks.)
Pipe gauge
Tightening torque
(in/mm)
153~163 kgf.cm
Ø1/4 in (6.35)
(15~16 N. m)
255~265 kgf.cm
Ø3/8 in (9.52)
(25~26 N. m)
357~367 kgf.cm
Ø1/2 in (12.7)
(35~36 N. m)
459~480 kgf.cm
Ø5/8 in (15.9)
(45~47 N. m)
Check whether the height drop between the indoor unit and
outdoor unit, and the length of refrigerant pipe meet the following
requirements:
The type of models
T1 condition
Split type air conditioner
R410A inverter
Split type air conditioner
T3 condition
(outdoor unit down)
T3 condition
(outdoor unit up)
O
/248 F. Use insulation which is
O
Flare dimension
Flare shape
A (mm)
0.327~0.343in
8.3~8.7
90
0.472~0.488in
12.0~12.4
0.606~0.622in
15.4~15.8
0.732~0.748in
18.6~19.0
Max.allowable
Max.allowable
Capacity
piping length
piping height
(Btu/h)
9K ~12K
49.2ft
/
15m
18K
82ft
/
25m
9K ~12K
82ft
/
25m
18K
98.4ft
/
30m
9K ~12K
82ft
/
25m
18K
98.4ft
/
30m
9K ~12K
82ft
/
25m
18K
98.4ft
/
30m
3.1 Flaring the pipe end
1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing downward so that the
chips do not enter the pipe.
3) Put the flare nut on the pipe.
4) Flare the pipe.
(in=mm/25.4)
Outer diam.
( in/mm)
Ø1/4 in
Ø3/8 in
Ø1/2 in
Ø5/8 in
5) Check that the flaring is properly made.
Flare s inner surface
must be flaw-free
o
4
o
3.2 Refrigerant piping
A
Coat the flare both inside and ouside with ether oil or ester oil .
R
0.016~0.031in
0.4~0.8
Coat here with ether oil or ester oil
26.2ft
/
8m
Align the cente s of both flares and tighten the flare nuts 3 or 4
turns by hand. Then tighten them fully with the torque wrenches.
49.2ft
/
15m
32.8ft
/
10m
65.6ft
/
20m
32.8ft
/
10m
49.2ft
/
15m
49.2ft
/
15m
65.6ft
/
20m
12
Cut exactly at
right angles.
A( in/mm)
Set exactly at the position shown below.
Max.
Min.
0.051/1.3
0.028/0.7
(6.35)
0.063/1.6
0.039/1.0
(9.52)
0.71/1.8
0.039/1.0
(12.7)
0.087/2.2
0.079/2.0
(15.9)
'
Make sure that the
flare nut is fitted.
r
1
2
3
4
1
2
3 4
Remove burrs.
Die
Copper pipe
The pipe end must
be evenly flared in a
perfect circle.
Torque wrench
Flare nut
Piping union
Spanner
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