5. INSTALL THE CONNECTING PIPE
Fig.5-1
Fig.5-2
Fig.5-3
Fig.5-4
CAUTION
CAUTION
R0.4~0.8
45
°
±
2
90
°
±
4
A
º
º
º
º
º
PP
$PP
Table 5-1
Table 5-2
Table 5-3
º
5.1 Refrigerant pipes
Lean
Rough
Burr
OD
Max.
Min.
1.Flare
1Cut the pipe with a knife.(See Fig.5-1)
2Fit the pipe to the flare of connecting nut(Table 5-1)
Tightening torque
N.m
º
º
º
º
º
97.2~118.6 N.m
(990~1210 kgf.cm)
(630~770 kgf.cm)
61.8~75.4 N.m
49.5~60.3 N.m
(504~616 kgf.cm)
(333~407 kgf.cm)
14.2~17.2 N.m
(144~176 kgf.cm)
32.7~39.9 N.m
º
109.5~133.7 N.m
(1115~1364 kgf.cm)
2.Fastening the nut
Align the connecting pipe and fastening the nut and then fasten it
with a wrech. (See Fig.5-2)
Pipe dimensions
When welding the refrigerant pipes, nitrogen flushing operation
should be applied otherwise the oxidation crumbs will block the
cooling system which will result in damage.
Large torque will distroy the flare, small torque will result in gas
leakage because of loose. Please refer to Table 5-2 for the
tightening torque.
Code
L2~L5
L1
a,b,c,d,e,f
A,B,C,D,E
5.2 Pipe types
Refrigerant settings
Names
Main pipe
Indoor unit main
pipe
Outdoor unit main
pipe
Indoor unit manifold
components
Piping position
Pipe between the outdoor unit and
indoor-side first manifold
Pipe which doesn’t connect directly with the
indoor unit the indoor-side first manifold
Pipe which connects directly with the
indoor unit behind the manifold
Outdoor unit
Outdoor unit
The first manifold
D
E
F
H
I
G
/
/
/
/
/
$
%
&
'
(
1
1
1
1
1
1
Indoor unit
$
%
'
(
&
D
E
F
H
I
G
/
/
/
/
/
Connecting method 1
Connecting method 2
The first manifold
All the manifolds used should be specialized ones designated by our
company. Fail to follow the requirements could lead to system error.
If the distance between the first manifold and the last one exceeds
15m, please apply the 2nd connecting way.
Distance between the indoor unit and the nearest manifold should
less than 15m.
5.3 Diameters of indoor unit connecting pipe
1Diameter reference table 4-4 of R410A indoor unit connecting pipe.
2E.g. 1: The downstream connecting indoor unit capacity of L2 is
45×2˙90,the diameter of gas pipe and liquid pipe will be
ĭ15.9/ĭ9.5 after checking.
Piping components among main connecting
pipe, main piping,and branch piping
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