3
INSTALLING
THE REFRIGERANT PIPE
A
All field piping must be provided by a licensed refrigeration
technician, and must comply with all relevant local and
national codes.
Precautions
•
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
sufficient resistance.)
•
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.)
I
Pip(�
g
�)
uge
Tightening torque
Fla「e
飞＄霄
sion
Flare shape
I
15-16N m
8 3-8 7
邵.35(1/4叫 (153-163 kgf.cm)
0.327-0.343in
90
。
土4
25-26 N. m
12.0-12.4
[?Jg 52(3/Sin) I (255-265 kgf.cm) 0.472�0.488in
35-36 N. m
15.4-15.8
012 1(112inll (357-367 kgf.cm)
0.606-0.622in
0159(5/8m)I
45-47 N. m
18.6-19.0
(459-480 kgfcm)
0.732-0.74Bm
•
Check whether the height drop between the indoor unit and
outdoor unit, as well as the length of refrigerant pipe, meet the
following requirements:
Capacity Max.allowable Max.allowable
Model Type
(Btu/h)
piping length piping height
9K-12K
25m/82ft
10m/33ft
R410A inverter
Split type ai「 conditione「
18K
30m/100ft
20m/66ft
3.1 Flaringthe Pipe
E
nd
s
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""""'"
ID
right angles. / I�Remove burrs
3) Put the flare nut onto the pipe.
4) Flare the pipe.
(in
=
mm/25.4)
Set exactly at the position shown below.
Oute「 diam.
A(mm)
(mm)
Max. Min.
邵35(1/4in) 1.3
0.7
邵.52(3/Bin) 1 6
1 0
如2.7(1/2in) 1 8
1 0
如5.9(5/Bin) 22
20
5) Check that the flaring is properly made.
Flare's inner surface
mustbe free of flaws
The pipe end must
be evenly fla
「
ed in a
perfect circle.
Make sure that the
flare nut is fitted.
3.2 Refrigerant Piping
•
Coat the flare, both inside and outside, with ether oil or ester oil
C
�
oa
�
t here with ether oi
厂
l or ester oil
•
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
Torque wrench
2
Flare nut
3
Piping union
4
Spanner
2 3 4
9
