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48
Refrigerant pipe installation
H/R
Classification
Installing only with Y-joint
Installing only with
MCU
MCU
MCU
g
H2
H3
H1
Installing with MCU
and Y-joint
MCU
MCU
MCU
n
h
l
H4
H1
H2
H3
o
p
q
Cooling Only Indoor Unit
(Connecting Only Low Pressure Gas Pipe /
Liquid Pipe
note3
)
Classification
Example
Remarks
Maximum
allowable
pipe length
Outdoor unit ~
Indoor unit
Actual pipe
length
(Equivalent
length)
200 m or less
(220 m or less)
/656'(722')
Installing only with
MCU
a+g+j ≤ 200 m (220 m)/656'(722')
Equivalent length
• Y-joint: 0.5 m(1.64')
• Distribution header: 1
m(3.28')
• MCU: 1 m(3.28')
Installing with MCU
and Y-joint
a+b+h+k ≤ 200 m (220 m)/656'(722')
Total length
of pipe
1000 m(3281')
or less
Installing only with
MCU
a+b+c+d+e+f+g+h+i+j ≤ 1000 m(3281')
Installing with MCU
and Y-joint
a+b+c+...+q ≤ 1000 m(3281')
Outdoor unit ~
Indoor unit
Pipe length
10 m(33')
or less
x ≤ 10 m (33'), y ≤ 10 m (33'), z ≤ 10 m (33')
Equivalent
length
13 m(43')
or less
x ≤ 13 m (43'), y ≤ 13 m (43'), z ≤ 13 m (43')
MCU ~ Indoor
unit
Pipe length
45 m(148')
or less
Installing only with
MCU
b+c ≤ 45 m(148'), b+d ≤ 45 m(148'),
b+e ≤ 45 m(148'), f≤ 45 m(148'),
g+h ≤ 45 m(148'), g+i ≤ 45 m(148'),
g+j ≤ 45 m(148')
Installing with MCU
and Y-joint
c+d ≤ 45 m(148'), c+e ≤ 45 m(148'),
c+f ≤ 45 m(148'), g ≤ 45 m(148'),
h+i ≤ 45 m(148'), h+j ≤ 45 m(148'),
h+k ≤ 45 m,(148') m ≤ 45 m(148'),
n ≤ 45 m(148'), o ≤ 45 m(148'), p ≤ 45 m(148')
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