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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 . Use insulation which is
sufficiently resistant.)
Also, in cases where the temperature and humidity of the
refrigerant piping sections might exceed 30
reinforce the refrigerant insulation(20mm 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 conncetions.
Do not mix anything other than the specified refrigerant, such
as air, etc.., Inside the refrigerant circuit.
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
(mm)
15~16 N. m
O6.35
(153~163 kgf.cm)
25~26 N. m
O9.52
(255~265 kgf.cm)
35~36 N. m
O12.7
(357~367 kgf.cm)
45~47 N. m
O15.9
(459~480 kgf.cm)
97.2~118.6 N. m
O19.1
(990~1210 kgf.cm)
Check whether the height drop between the indoor unit and
outdoor unit, and the length of refrigerant pipe meet the following
requirements:
Capacity
The type of models
(
Btu/h
<15000
R410A inverter
>15000~<24000
Split type air
conditioner
>24000~<36000
>36000~<60000
or Rh80%,
Flare dimension
Flare shape
A (mm)
8.3~8.7
o
4
90
12.0~12.4
A
15.4~15.8
18.6~19.0
22.9~23.3
Max.allowable
Max.allowable
)
piping length
piping height
25m
30m
50m
65m
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.
Outer diam.
(mm)
O6.35
O9.52
O12.7
O15.9
5) Check that the flaring is properly made.
Flare s inner surface
must be flaw-free
3.2 Refrigerant piping
o
Coat the flare both inside and ouside with
R0.4~0.8
Coat here with ether oil or ester oil
Align the centres of both flares and tighten the flare nuts 3 or 4
turns by hand. Then tighten them fully with the torque wrenches.
10m
20m
25m
30m
16
Cut exactly at
right angles.
Remove burrs.
A(mm)
Set exactly at the position shown below.
Max.
Min.
1.3
0.7
1.6
1.0
1.8
1.0
Copper pipe
2.2
2.0
The pipe end must
be evenly flared in a
perfect circle.
'
Make sure that the
flare nut is fitted.
1
2
3
4
1
2
3 4
Die
ether
oil or
ester
oil .
Torque wrench
Flare nut
Piping union
Spanner
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