Johnson JR8 Serie Guide D'utilisation page 133

9.3 Outdoor Unit Ducting
The following principles shall be followed when installing the air
guide device:
The addition of louvers will affect the air output of the unit,
so the use of louvers is not recommended. If you want to
use it, please control the shutter angle below 15° and
ensure that the effective opening rate of the shutter is
more than 90%.
The exhaust duct of each fan must be installed
independently. It is forbidden to assemble the exhaust
hood between machines in parallel in any form, otherwise
it may cause unit failure.
Please install a soft connection between the machine and
the air duct to prevent vibration and noise.
Circular flexible air duct must be used for installation.
The Recommended diameters of Circular flexible air
ducts：
Table 9.5
Diameters of
HP
Grille (mm)
8-14HP 665
16-22HP 793
The installation of circular flexible air ducts
ODU Circular flexible air ducts
Self-tapping screws
Washer
Fixing Circular flexible air ducts on the front panel by
self-tapping screws.
There are advised to use 8 self-tapping screws, and
the position showing as fig.9.9.
Self-tapping
screws
Minimum diameters
of air ducts(mm)
≥700
≥820
Fig.9.7
Fig.9.8
Fig.9.9
54
9.4 Fan Performance
8HP Fan characteristics Curve
90
80
80Pa
70
60
60Pa
50
40Pa
40
20Pa
30
0Pa
20
10
11800(rated)
0
10000 11000 12000 13000
Air flow (m³/h)
10HP Fan characteristics Curve
90
80Pa
80
70
60Pa
60
40Pa
50
40
20Pa
30
0Pa
20
10
12500(rated)
0
10000 11000 12000 13000
Air flow (m³/h)
12HP Fan characteristics Curve
90
80
80Pa
70
60Pa
60
50
40Pa
40
20Pa
30
0Pa
20
10
12500(rated)
0
10000 11000 12000 13000
Air flow (m³/h)
14000
14000 15000
14000 15000
V.1