VI-23
I
NSTALLATION
Main pipe 1 size increment
Pipe size
Thickness(mm) Material
(O. D. mm)
ø 6.35 0.7
ø 9.52 0.7
ø 12.70 0.8
ø 15.88 0.8
ø 19.05
ø 22.23
ø 25.40 1.0
ø 28.58
ø 31.75
ø 38.10 1.35
ø 44.45 1.6
ø 50.80 2.0
Main pipe
❇
Main pipe : from outdoor unit to the first branch
joint
Equivalent pipe length between
outdoor unit and the farthest indoor unit
C1220T-1/2H
(Half-hard)
C1220T-O
(Annealed)
0.9
1.1
The pipe length between outdoor and the farthest indoor unit
below 90 m 90m and over
ø 9.52 ø 12.70
ø 12.70 ø 15.88
ø 15.88 ø 19.05
ø 19.05 ø 22.23
ø 22.23 ø 25.40
ø 25.40 ø 28.58
ø 28.58 ø 31.75
ø 31.75 ø 38.10
ø 38.10 ø 44.45
ø 44.45 ø 50.80
Elbow
Pipe size (O. D. mm) Equivalent length (m)
ø 9.52 0.18
ø 12.70 0.20
ø 15.88 0.25
ø 19.05 0.35
ø 22.23 0.40
ø 25.40 0.45
ø 28.58 0.50
ø 31.75 0.55
ø 38.10 0.60
ø 41.30 0.70
ø 44.45 0.75
ø 50.80 0.80
Type Equivalent length (m)
Y joint 0.5
Header joint 1.0
When the equivalent pipe length from outdoor unit to the farthest indoor unit is over
than 90m, the main pipe (both liquid and gas pipe) has to be increased with 1 size like
below table.
❈ Equivalent length calculation method
Equivalent length = actual pipe length(m) + number of ‘Y-joint' X 0.5(m) + number
of 'Header joint' X 1.0(m) + number of elbows X equivalent
length of each elbow
06_Installation(02~45) 3/15/08 4:34 Page 23
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