Bigass 4900 Manuel D'installation page 31

Big Ass Fans are the highest quality, most meticulously engineered HVLS fans on the planet, moving a lot of air
with their size, not speed. Moving at a low speed means less energy used for operation, translating into more
energy savings year-round. Follow the procedures below to ensure the most efficient operation of your Big Ass
Fan.
To ensure proper fan rotation:
1. Turn on the fan.
2. Verify that the fan is rotating in the counterclockwise direction (when viewed from below).
3. If the fan is not rotating counterclockwise, reverse the direction of rotation. See the previous page for
instructions on changing the direction of rotation.
Heating season
Big Ass Fan 4900 fans return heat from the ceiling to floor level more efficiently than small ceiling fans. For
maximum energy savings, the fan should be operated continuously during the heating season and should not be
operated in reverse (clockwise). Big Ass Fans are designed to operate efficiently at very low speeds, so turning
the fan very slowly in the forward direction (counterclockwise) will provide enough air movement to circulate the
hot air at the ceiling down to the floor without causing drafts.
Adjust the fan speed to the appropriate starting fan speed listed in the table below.
Floor-to-Ceiling Height (ft)
< 40
≥ 40
Stand directly below the tips of the airfoils with hand outstretched. If you feel a draft, slightly decrease the fan
speed (0.5). Repeat until the draft is no longer noticeable.
Cooling season
The cooling effect created by the breeze from Big Ass Fan 4900 fans keeps occupants comfortable with the
thermostat at a higher setting. During the cooling season, every degree higher that the thermostat is reset reduces
the energy consumed by the air conditioner by 1.5–2%. To minimize energy usage during the cooling season,
operate the fan only when building occupants are present.
Adjust the fan speed to the appropriate starting fan speed listed in the table below.
Floor-to-Ceiling Height (ft)
< 40
≥ 40
Increase the speed of the fan until desired air speed or maximum fan speed is reached. In air conditioned facilities,
increase the thermostat setting by 2–7°F to save energy.
Starting Fan Speed
15 Hz
20 Hz
Starting Fan Speed
25 Hz
40 Hz
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Display %
20–30%
30–40%
Display %
40–50%
60–70%
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