THE REFRIGERANT PIPE
All field piping must be provided by a licensed refrigeration
technician, and must comply with all relevant local and
Execute heat insulation work to completion on both sides of the
gas piping and liquid piping. Otherwise, it can sometimes result
in water leakage.
(When using a heat pump, the temperature of the gas piping can
reach up to approximately 120'C/248 F. Use insulation that has
Also, in cases where the temperature and humidity of the
refrigerant piping sections might exceed 30'C/86 F or Rh80%,
reinforce the refrigerant insulation (by 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 conncetions.
Do not mix anything other than the specified refrigerant, such
as air, etc.., into the refrigerant circuit.
If the refrigerant gas leaks during the work, ventilate the area.
A toxic gas is at risk of being emitted by the refrigerant gas if
exposed to a fire.
Make sure there is no refrigerant gas leak. A toxic gas may be
released by the refrigerant gas leaking indoors 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.)
Tig htening tor q ue
邵.35( 1 / 4 叫 ( 1 53-163 kgf.cm)
25-26 N. m
[?Jg 52(3/Sin) I ( 2 55-265 kgf.cm)
35-36 N. m
01 2 1 ( 11 2 i n ll (357-367 kg f .cm
45-47 N. m
( 4 59-480 kgfcm )
Check whether the height drop between the indoor unit and
outdoor unit, as well as the length of refrigerant pipe, meet the
( B tu/h )
Split type ai「 conditione「
8 3-8 7
pipi ng leng th
pipi ng heig ht
Flaring the Pipe
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.
c" "" "' "
3) Put the flare nut onto the pipe.
4) Flare the pipe.
A ( m m)
邵35(1/ 4 in)
5) Check that the flaring is properly made.
Flare's inner surface
must be free of flaws
Coat the flare, both inside and outside, with ether oil or ester oil
t here with ether oi
Align the centres of both fla「es, and tighten the flare nuts 3 or 4
turns by hand. Then tighten them fully with the torque wrenches
/ I�Remove burrs
Set exactly at the position shown below.
The pipe end must
be evenly fla
ed in a
Make sure that the
flare nut is fitted.
l or ester oil
Tor q ue wrench
P iping union