15
ENGLISH
WARNING
• It is recommended that difference of piping length for pipes
connected to the Indoor Unit is minimized. Performance
difference between Indoor Units may occur.
• When the any one (or both ) of below conditions are satisfied,
the diameter of main pipe (A) must be increased according to
below table.
- The equivalent length between outside unit and the farthest
indoor unit is 90m or more (Liquid and Gas pipes are
increased)
!
Refrigerant pipe diameter from branch to branch (B,C)
Downward Indoor
Unit total capacity
[kW(Btu/h)]
Liquid pipe [mm(inch)]
Gas pipe [mm(inch)]
≤
5.6(19,100)
Ø6.35(1/4)
Ø12.7(1/2)
< 16.0(54,600)
Ø9.52(3/8)
Ø15.88(5/8)
Refrigerant pipe diameter from outside unit to first branch. (A)
Outside unit
total capacity(HP)
Liquid pipe [mm(inch)]
Gas pipe [mm(inch)]
5
Ø9.52(3/8)
Ø15.88(5/8)
Limits of pipe length and difference in height
Indoor Unit Connection
Indoor Unit connecting pipe from branch (a,b,c,d,e,f)
Indoor Unit capacity
[kW(Btu/h)]
Liquid pipe
[mm(inch)]
Gas pipe [mm(inch)]
≤
5.6(19,100)
Ø6.35(1/4)
Ø12.7(1/2)
< 16.0(54,600)
Ø9.52(3/8)
Ø15.88(5/8)
CAUTION
• Bending radius should be
at least twice the diameter
of the pipe.
• Bend pipe after 500 mm or
more from branch(or
header).
Do not bend U type.
It may cause Performance
unsatisfactory or noise.
• If want U type, bending R
is more than 200 mm.
!
500mm or more
500mm or more
The amount of Refrigerant
The calculation of the additional charge should take into account the
length of pipe and CF(correction Factor) value of indoor unit.
Attach the additional refrigerant table of IDU.
CAUTION
Use only 4-series of indoor unit. Ex) ARNU***2
Do not connect Hydrokit.
!
WARNING
• Branch pipe can not be used after header.
• Pipe length after header branching
- It is recommended that difference in length of the pipes
connected to the indoor units (a~f) is minimized. Performance
difference between indoor units may occur.
- Indoor units should be installed at lower position than the
header.
!
Connection method
Mark Y branch only
Combination of
Y branch /
header
Header only
Longest pipe length : Heat
Exchanger Module
↔
Compressor Module
L1
A
≤
30 m
A
≤
30 m
A
≤
30 m
Longest pipe length :
Compressor Module
↔
Indoor Unit
L2
B+C+D+E+e
≤
70 m
B+C+b
≤
70 m
B+D+e
≤
70 m
B+f
≤
70 m
Longest pipe equivalent
length* : Compressor
Module
↔
Indoor Unit
L2*
90 m
90 m
90 m
Longest pipe length after
1st branch
ℓ
30 m
30 m
30 m
Total pipe length
- A+B+C+D+E+e
≤
140 m
A+B+C+D+a+b+
c+d+e
≤
140 m
A+B+a+b+c+d+
e+f
≤
140 m
Difference in height :
Compressor Module
↔
HEX Module
H1
10 m
10 m
10 m
Difference in height :
Compressor Module
↔
Indoor Unit
H2
30 m
30 m
30 m
Difference in height :
Indoor Unit
↔
Indoor Unit
h
15 m
15 m
15 m
Max.
dif
ference
in
height
Max.
pipe
lengt
h
NOTE
!
• * : Assume equivalent piping length of Y branch to be 0.5m, that
of header to be 1m, calculation purpose.
WARNING
• When the below condition is satisfied, the diameter of main pipe
(B : Compressor Module
↔
1 st Branch) must be increased
according to below table.
- The equivalent length between Heat Exchanger Module and
the farthest indoor unit is 90m or more
(Liquid / Gas pipes are increased in accordance with below
tables)
!
Additional
charge (kg)
= L1(m) : Total length of liquid pipe with
Ø12.7mm
×
0.118 (kg/m)
Important
Check the Total length between
Heat Exchanger Module ~ Compressor
Module ~ Indoor Unit
+ L2(m) : Total length of liquid pipe with
Ø9.52mm
×
0.061 (kg/m)
+ L3(m) : Total length of liquid pipe with
Ø6.35mm
×
0.022 (kg/m)
+ CF value of Heat Exchanger Module
(1 kg)
+ CF value of Indoor unit *
NOTE
!
• * : For CF value (additional refrigerant) table of indoor units,
please refer to PDB of indoor unit.
www.lgcomfortcooling.co.uk
