20
Refrigerant pipe installation
Connection by header joint
g
Outdoor unit
Header joint
Indoor unit
Connection by Y-joint/header joint
H2
H1
f
c
g
Outdoor unit
Indoor unit
Header joint
Y-joint
Classification
Header joint connection
Y-joint / header joint connection
Maximum
allowable
length of
pipe
Outdoor
unit ~
Indoor units
Actual Length
The distance between an outdoor unit and the farthest indoor unit ≤ 150m
Ex) 8 indoor units
a+g≤ 150m
Ex) 8 indoor units
a+b+c ≤ 150m
Equivalent length
The distance between an outdoor unit and the farthest indoor unit ≤ 175m
Main pipe length
The main pipe(a) from the outdoor unit to the first Y-joint should be less than
110m.
Total length
The sum of total length of pipes should be less then 300m.
Maximum
allowable
height
Outdoor
unit ~
Indoor units
Height
H1: The difference in height between an outdoor unit and indoor unit < 50m
Height
H2: The difference in height between indoor units ≤ 15m
Maximum allowable
length after Y-joint
Actual Length
The distance between the header
joint and the indoor unit ≤ 40m
Ex) b, c ~ f, g ≤ 40m
The distance between the first Y-joint
and the farthest indoor unit ≤ 40m
Ex) 8 indoor units
b+c, d+g ≤ 40m
❋
When the equivalent length between an outdoor unit and the farthest indoor unit exceeds 90m, upgrade the low
pressure pipe of the main pipe one step.
