Increasing The Fan Speed - Sanyo CH2442 Installation Instructions Manual

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. 3-85.
(5) Place the cable neatly in the box and reinstall
the cover plate.
Indoor Fan Performance
24 Type
150
100
HT
50
HH
H
L
0
300 500 700 900
Air Flow (CFM)
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 (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 24 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.
36 Type
200
150
0.5
0.4 100
0.3
0.2 50
0.1
0 0
500
Air Flow (CFM)
1982_U_I
Fig. 3-86
Electrical component box
Booster cable
Fan
motor
Fan motor socket
(At shipment)
12 Type
150
100
50
HT
HH
H
L
0
200 300 400
Air Flow (CFM)
1980_U_I
0.8
0.6
0.5
0.4
0.3
HT
0.2
HH
0.1
H
L
0
1000
1983_U_I
39 S4359146
Booster cable
(Booster cable installed)
0491_M_I
Fig. 3-85
18 Type
150
0.5
100
0.4
0.3
50
0.2
0.1
H
L
0
0
200 300 400
Air Flow (CFM)
0.5
4 4 4 4 4
0.4
0.3
U
0.2
HT
HH
0.1
0
500
1981_U_I