Increasing The Fan Speed - Sanyo C4272R S/C Installation Instructions Manual

07-115 SSHP_II 5/7/07 4:00 PM

3-26. 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
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 the Fig. 3-104.
(5) Place the cable neatly in the box and reinstall the
cover plate.
I How to read the diagram
The vertical axis is the external static pressure
(Pa) while the horizontal axis represents the air
flow (CFM).
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 26 type, the air flow is 636 CFM,
while the external static pressure is 49 Pa at "H"
position. If external static pressure is too great
(due to long extension of duct, 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.
Page 55
Electrical component box
Booster cable
Fan
motor
Fan motor socket
(At shipment)
Fig. 3-104
Indoor Fan Performance
26 Type
150
0.5
100 0.4
0.3
HT
50 0.2
HH
0.1
H
L
0 0
300 500 700 900
Air Flow (CFM)
HT : Using the booster cable
NOTE
H : At shipment
Fig. 3-105
55
Booster cable
(Booster cable installed)
36 Type
200
150
100
HT
50
HH
H
L
0
500 1000
Air Flow (CFM)
U
0.8
0.6
0.5
0.4
0.3
0.2
0.1
0