1-9 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 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.
| 1. Specifications |
Electrical component box | |
Jumper cable |
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Fan | Jumper cable |
motor | |
Fan motor socket |
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(At shipment) | (Jumper cable installed) |
2159_M_I
1
Indoor Fan Performance |
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| 26 Type |
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| 36 Type |
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| 200 |
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| 0.8 |
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| (Pa) |
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| (inAq) |
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| line |
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| 150 | line |
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| 150 |
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| Limit |
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| 0.6 | |||
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PressureStaticExternal | (Pa) | Limit |
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| 0.5 | PressureStaticExternal |
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| 0.5 |
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| 100 |
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| 0.4 |
| 100 |
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| 0.4 | |
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| Limit |
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| Limit |
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| 0.3 | |
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| 0.3 |
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| HT |
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| 50 |
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| 0.2 |
| 50 |
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| HT |
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| 0.2 |
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| HH |
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| H | H |
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| H |
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| 0.1 |
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| H |
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| 0.1 |
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| L |
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| L |
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| 0 |
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| 0 |
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| 0 |
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| 300 | 500 |
| 700 | 900 |
| 500 |
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| 1000 |
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| Air Flow (CFM) |
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| Air Flow (CFM) |
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| 1982_U_I |
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| 1983_U_I | |||
| NOTE |
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| HT | : Using the booster cable |
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| H | : At shipment |
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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.
