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1-9. Indoor Fan Performance
Booster Cable for Concealed-Duct Type
If external static pressure is too great (due to long
extension of ducts, for example), the airfl ow volume
may drop too low at each air outlet. This problem
may be solved by increasing the fan speed using
the following 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. 1-1.
(5) Place the cable neatly in the box and reinstall
the cover plate.
• How to Read the Diagram
The vertical axis is the external static pressure (Pa)
while the horizontal axis represents the airfl ow (m
minute). The characteristic curves for "HT," "H," "M"
and "L" fan speed control are shown.
The nameplate values are shown based on the "H"
airfl ow. For the 25 type, the airfl ow is 18 m
while the external static pressure is 49 Pa at "H"
position. If external static pressure is too great (due
to long extension of ducts, for example), the airfl ow
volume may drop too low at each air outlet.
SPW-UR254GH56 (A/B)
SPW-UR254SH56B
SPW-U255H (N)
SPW-U255SH (T)
150
100
50
L
0
10
3
Airfl ow (m
NOTE
HT :
H :
3
/minute,
15
150
10
100
HT
H
5
50
M
0
0
20
/minute)
Using the booster cable
At shipment
Fan
motor
SPW-UR124GH56 (A/B)
SPW-U125H (N)
150
100
3
/
50
L
0
5
Airfl ow (m
SPW-UR364GH56 (A/B)
SPW-UR364SH56B
SPW-U365H (N)
SPW-U365SH (T)
15
HT
10
H
5
M
L
0
20
30
3
Airfl ow (m
/minute)
Fig.1-2
1-306
Electrical component box
Booster cable
Fan motor socket
(At shipment)
(Booster cable installed)
Fig.1-1
Indoor Fan Performance
SPW-UR164 / 184GH56 (A/B)
SPW-UR184SH56B
SPW-U165 / 185H (N)
SPW-U185SH (T)
15
150
10
100
HT
5
50
H
M
0
0
10
3
/minute)
Airfl ow (m
SPW-UR484 / 604GH56 (A/B)
SPW-UR484 / 604SH56B
SPW-U485 / 605H (N)
SPW-U485 / 605SH (T)
150
100
50
L
0
20
Airfl ow (m
Booster cable
15
10
5
HT
H
M
L
0
10
15
3
/minute)
15
10
HT
H
5
M
0
30
40
3
/minute)
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