Airwell VVFA Series Service Manual page 26

Long pipe and high drop
1. Allowable pipe length and height difference
Outdoor unit
First branch piping
Total length of piping (actual length)
Single way max. pipe length
Pipe length between outdoor and first branch pipe
Piping
Pipe length after first branch pipe (length between first
length
Pipe length between the indoor unit & the nearest
Height difference between
Height
indoor and outdoor unit
difference
Height difference between indoor units
Note:
When the single way pipe length is over 30m, the main pipe should be the enlarged diameter.
Unit pipe spec and connection method (unit: mm)
A. Outdoor unit
Gas pipe side
Model
Diameter Connecting
(mm)
4HP Ø15.88
5HP Ø15.88 Flared joint
6HP Ø15.88
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
branch & farthest indoor)
branch length
Indoor below outdoor
Indoor above outdoor
Liquid pipe side
Diameter Connecting
method (mm)
Ø9.52
Ø9.52 Flared joint
Ø9.52
Model (optional)
TAU-335
Indoor unit
Permissible value
Actual length
C. Pipe spec and the torque
Diameter (mm)
Ø6.35
method
Ø9.52
Ø12.7
Ø15.88
Ø19.05
Ø22.22
Ø25.4
Not less than Ø28.58 More than 1.4
Note: If the copper pipe with outer diameter 19.05 is
coil pipe, the thickness should be over 1.1.
24
Piping part
300m L1+L2+L3+L4+a+b+c+d+e
150m L1+L2+L3+L4+e
110m
40m L2+L3+L4+e
10m a / b / c / d / e
50m
40m
15m
Thickness (mm) Torque (N.m)
0.8
0.8
1.0
1.0
1.0
1.1
1.2
L1
H
H
h
16~20
40~50
90~120
100~140
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