Samsung AM***XMDCH Series Installation Manual page 20

Refrigerant pipe installation
Connection by header joint
Outdoor unit
Header joint
Connection by Y-joint/header joint
Outdoor unit
Y-joint
H1
Indoor unit
Classification
Maximum
Outdoor
allowable
unit ~
length of
Indoor units
pipe
Maximum Outdoor
allowable unit ~
height Indoor units
Maximum allowable
length after Y-joint
20
g
Indoor unit
Header joint
g
f
c
Header joint connection
The distance between an outdoor unit and the farthest indoor unit ≤ 150m (492')
Actual
Ex) 8 indoor units
Length
a+g≤ 150m (492')
Equivalent
The distance between an outdoor unit and the farthest indoor unit ≤ 175m (574')
length
Main pipe The main pipe(a) from the outdoor unit to the first Y-joint should be less than 110m
length (361').
Total
The sum of total length of pipes should be less then 300m (984').
length
H1: The difference in height between an outdoor unit and indoor unit < 50/40m
Height
Note 1)
(164'/131')
Height H2: The difference in height between indoor units ≤ 15m (49')
The distance between the header joint
Actual
and the indoor unit ≤ 40m (131')
Length
Ex) b, c ~ f, g ≤ 40m (131')
H2
Ex) 8 indoor units
a+b+c ≤ 150m (492')
The distance between the first Y-joint and
the farthest indoor unit ≤ 40m (131')
Ex) 8 indoor units
b+c, d+g ≤ 40m (131')
Y-joint / header joint connection