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1. Specifications
1-9 Increasing the Fan Speed
Jumper cable
Jumper cable
Electrical component box
(At shipment) (Jumper cable installed)
2159_M_I
Fan motor socket
Fan
motor
900
Air Flow (CFM)
External Static Pressure
0
50
0
0.1
0.2
0.3
0.4
0.5
150
700500300
Limit line
L
100
1982_U_I
H
HH
(Pa)
(inAq)
Limit line
HT
Air Flow (CFM)
External Static Pressure
0
50
0
0.1
0.2
0.3
0.4
0.5
0.6
0.8
150
200
500 1000
Limit line
L
H
HH
HT
100
1983_U_I
(inAq)
(Pa)
Limit line
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 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.
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 jumper cable (sockets at both ends) clamped
in the box.
(4) Securely connect the jumper cable sockets
between the disconnected fan motor sockets in step 2.
(5) Place the cable neatly in the box and reinstall the cover
plate.
Indoor Fan Performance
epyT 63epyT 62
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