8
installation manual
7. INSTALL THE CONNECTING PIPE
Check whether the height drop between the indoor unit and
outdoor unit, the length of refrigerant pipe, and the number of
the bends meet the following requirements:
(The number of the bends less than 15)
Table 7-1
The length ofefrigerant pipe
The max height drop
Model
18/24
36/60
72
20
10
25
10
30
15
unit: m
Drill a hole in the wall (suitable just for the size of the wall
conduit), then set on the fittings such as the wall conduit and
its cover.
Bind the connecting pipe and the cables together tightly with
binding tapes.
Pass the bound connecting pipe through the wall conduct
from outside. Be careful of the pipe allocation to do on
damage to the tubing.
Connect the pipes. Refer to "How to Connect the pipes" for
details.
Expel the air with a vacuum pump. Refer to "How to expel the
air with a vacuum pump" for details.
Open the stop values of the outdoor unit to make the
refrigerant pipe connecting the indoor unit with the outdoor
unit in fluent flow.
Check the leakage. Check all the joints with the leak detector
or soap water.
Cover the joints of the connecting pipe with the soundproof /
insulating sheath (fittings), and bind it well with the tapes to
prevent leakage.
1
2
3
5
6
7
4
Be sure to with insulating materials cover all the exposed
parts of the flare pipe joints and refrigerant pipe on the
liquid-side and the gas-side. Ensure that there is no gap
between them.
Incomplete insulation may cause water condensation.
CAUTION
The Procedure of Connecting Pipes
7.1
CAUTION
All field piping must be provided by a licensed
refrigeration technician and must comply with the
relevant local and national codes.
Do not let air, dust, or other impurities fall in the pipe
system during the time of installation.
The connecting pipe should not be installed until the
indoor and outdoor units have been fixed already.
Keep the connecting pipe dry, and do not let moisture in
during installation.
Execute heat insulation work completely on both sides
of the gas piping and the liquid piping. Otherwise, this
can sometimes result in water leakage.
How to Connect the pipes
Flaring
1
Cut a pipe with a pipe cutter.
(Refer to Fig.7-1)
Insert a flare nut into a pipe and flare the pipe.
Refer to Table 7-2 for the dimension of flare nut spaces.
Fig.7-1
90
Lean crude burr
Table 7-2
Ø6.4
8.3 8.7
Ø9.5
12.0
Ø12.7
15.4
Ø15.9
Ø19.1
18.6
22.9
R0.4~0.8
45 ° ±
2
90 °
± 4
A
65
～
67N.m
(663
～
684 kgf.cm)
45
～
47 N.m
(459
～
480 kgf.cm)
35
～
36 N.m
(357
～
367 kgf.cm)
25
～
26N.m
(255
～
265 kgf.cm)
15
～
16 N.m
(153
～
163 kgf.cm)
(mm)
min max
Pipe gauge
Tightening torque
Flare dimensin A
Flare shape
12.4
15.8
19.0
23.3
2
Bend the tubing in proper way. Do not harm to them.
Connect the indoor unit at first, then the outdoor
unit.
Bend the pipe with thumb
min-radius 100mm
Fig.7-2
The bending angle should not exceed 90.
Bending position is preferably in the middle of the
bendable pipe. The larger the bending radius the better it
is.
Do not bend the pipe more than three times.
When connecting the flare nut, coat the flare both inside
and outside with either oil or ester oil and initially tighten
by hand 3 or 4 turns before tighting firmly.
Fig.7-3
