Tabla de contenido
3-22. Increasing the Fan Speed
If external static pressure is too great (due to long
extension of ducts, for example), the air flow volume
may drop too low at each air outlet. This problem may
be solved by increasing the fan speed using the fol-
lowing procedure:
(1) Remove 4 screws on the electrical component box
and remove the cover plate.
(2) Disconnect the fan motor sockets in the box.
(3) Take out the booster cable (sockets at both ends)
clamped in the box.
(4) Securely connect the booster cable sockets
between the disconnected fan motor sockets in
step 2 as shown in Fig. 3-70.
(5) Place the cable neatly in the box and reinstall the
cover plate.
Indoor Fan Performance
25 Type
150
100
HT
H
50
M
L
0
10
20
3
Air Flow (m
/minute)
NOTE
NOTE
HT : Using the booster cable
H : At shipment
■ How to read the diagram
The vertical axis is the external static pressure (Pa) while the horizontal axis represents the air flow (m
The characteristic curves for "HT", "H", "M" and "L" fan speed control are shown. The nameplate values are shown
based on the "H" air flow. For the 25 type, the air flow is 18 m
"H" position. If external static pressure is too great (due to long extension of ducts, for example), the air flow volume
may drop too low at each air outlet. This problem may be solved by increasing the fan speed as explained above.
DC̲Inverter̲Eng.indd 41
DC̲Inverter̲Eng.indd 41
36 Type
15
150
HT
10
100
H
5
50
M
L
0
0
20
30
Air Flow (m
3
/minute)
Booster cable
Fan
motor
Fan motor socket
(At shipment)
12 Type
150
100
50
M
L
0
5
10
Air Flow (m
3
/minute)
48 Type
15
150
10
100
HT
H
5
50
M
L
0
0
20
30
Air Flow (m
3
/minute)
Fig. 3-71
3
/minute, while the external static pressure is 49 Pa at
41
Electrical component box
Booster cable
(Booster cable installed)
Fig. 3-70
16, 18 Types
150
15
10
100
HT
5
50
H
H
M
L
0
0
10
3
Air Flow (m
/minute)
60 Type
15
150
HT
10
100
H
5
50
M
L
0
0
40
18
22
26
30
34
Air Flow (m
3
/minute)
3
/minute).
GB
FR
15
DE
10
IT
5
HT
0
PT
15
GR
ES
38
42
2007/07/25 13:21:42
2007/07/25 13:21:42
Tabla de contenido
