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Installation instruction
Long pipe and high drop
1. Allowable pipe length and height difference
Maximal length and drop height permissible of refrigerant piping
Piping
Longest piping L
length
Piping length of indoor unit which is furthest to the first branch
Drop height between indoor and
Drop
outdoor unit H
height
Unit pipe spec and connection method (unit: mm)
A. Outdoor unit
Gas pipe side
Model
Diameter
Connecting
(mm)
AU03
Ø15.88
AU05
Ø19.05
Flared joint
AU07
Ø19.05
B. Indoor unit
Please refer to the indoor air conditioner manul.
Connecting method: Flared joint
Branch pipe
Outdoor unit type
Branch pipe selection:
Total indoor capacity (100W)
Less than 335
Outdoor unit
First branch piping
Total length of piping (actual length)
piping L (*)
Drop height between indoor units h
Liquid pipe side
Diameter
method
(mm)
Ø9.52
Ø9.52
Ø9.52
Model (optional)
Indoor unit
Length of the longest piping L
Length of the longest piping after the
first branch piping L (*)
Actual / Equivalent length
Up outdoor
Under outdoor
C. Pipe spec and the torque
Diameter (mm)
Connecting
method
Flared joint
Not less than Ø28.58
Note: If the copper pipe with outer diameter 19.05 is coil
pipe, the thickness should be over 1.1.
FQG-B335A
10
Permissible value
80
120m
L1+L2+L3+L4+a+b+c+d+e
140/180
150m
60/70m
40m
50m
40m
10m
Thickness (mm) Torque (N.m)
Ø6.35
0.8
Ø9.52
0.8
Ø12.7
1.0
Ø15.88
1.0
Ø19.05
1.0
Ø22.22
1.1
Ø25.4
1.2
More than 1.4
h≤10m
Piping part
L1+L2+L3+L4+e
L2+L3+L4+e
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16~20
40~50
90~120
100~140
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