3 INSTALL THE REFRIGERANT PIPE
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.)
Before rigging tubes, check which type of refrigerant is used.
All field piping must be provided by a licensed refrigeration
technician and must comply with the relevant local and
national codes.
Use a pipe cutter and flare suitable for used refrigerant.
Do not mix anything other than the specified refrigerant, such
as air, etc.., Inside the refrigerant circuit.
Coat the flare both inside and ouside with ether oil or ester oil .
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.
8
Also, in cases where the temperature and humidity of the
refrigerant piping sections might exceed 30 or Rh80%,
reinforce the refrigerant insulation(20mm or thicker).
Condensation may form on the surface of the insulating material.
Only use annealed material for flare conncetions.
Coat here with ether oil or ester oil
Precautions
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.
5) Check that the flaring is properly made.
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
(mm)
Outer diam.
(mm)
Tightening torque
A(mm)
Max.
1.3
1.6
1.8
2.2
Min.
0.7
1.0
1.0
2.0
Flare dimension
A (mm)
Flare shape
O6.35
O6.35
15~16 N. m
(153~163 kgf.cm)
8.3~8.7
12.0~12.4
15.4~15.8
18.6~19.0
25~26 N. m
(255~265 kgf.cm)
35~36 N. m
(357~367 kgf.cm)
45~47 N. m
(459~480 kgf.cm)
O9.52
O9.52
O12.7
O12.7
O15.9
O15.9
R0.4~0.8
45
2
90 4
A
o
o
1 Torque wrench
2 Flare nut
3 Piping union
4 Spanner
1
2 3 4
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.
3.2 Refrigerant piping
Check whether the height drop between the indoor unit and
outdoor unit, and the length of refrigerant pipe meet the following
requirements:
Capacity
Btu/h
(
)
The type of models
Max.allowable
piping length
25m
50m
<15000
R410A inverter
Split type air
conditioner
Max.allowable
piping height
10m
25m
30m
65m
>15000~<24000
>24000~<36000
>36000~<60000
20m
30m
Cut exactly at
right angles.
Remove burrs.
Flare
'
s inner surface
must be flaw-free
The pipe end must
be evenly flared in a
perfect circle.
Make sure that the
flare nut is fitted.
3) Put the flare nut on the pipe.
4) Flare the pipe.
Die
Copper pipe
A
Set exactly at the position shown below.
10
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