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PNEG-524 Roof Exhaust Fan 21
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Before Starting Fan
When starting the fan for the first time, check the following:
1. With the power OFF, rotate the fan blade to make sure it revolves easily, and does not rub
on the venturi or fan tube.
2. Check all the fasteners to make sure they are tight. If any are loose, check for proper
clearance and retighten.
3. With the power OFF, check all electrical connections to make sure they are tight. Inspect
the current carrying wires to make sure they are not grounded. Make sure the fan and
disconnect are grounded. All control enclosure covers and access doors should be secured
in place.
4. Refer to the wiring diagram on the motor, and make sure the motor is wired correctly.
Starting the Fan
The roof exhaust fans should operate anytime the supply fans operate. The roof fans can
operate independently of the supply fans just to provide ventilation of the attic space, but this
requires that vents be used in the roof to provide an open area.
Fan Shut OFF
When shutting the fan down for the season, shut OFF the power at the fan disconnect rather than
at the fan controls to provide additional protection from unauthorized personnel operating the
fan, and potential damage to the fan from a lightning strike.
Off Season Operation and Maintenance
During the off season, the fan blade should be allowed to turn freely. The fan should operate for
approximately 30 minutes every three weeks. This keeps the fan lubricant more evenly
distributed within the bearing cavity, and dries out any condensation that could be in the motor.
Fan Service
When servicing the fan, switch power OFF at the fan disconnect switch. Activate power only
when a check is made. The following items will help you to pinpoint a possible malfunction of the
fan unit and explain the corrective action to take.
If the motor controller is turned ON and nothing happens, check the following:
1. Make sure power is available to the fan unit.
2. Check the motor thermostat (if present) to determine if the thermostat is open or closed. If
the thermostat is open, take the motor to your local authorized service center. When
checking the thermostat, make sure the motor has time to cool, if hot.
3. If power is available to the motor and it does not run, remove the motor and take it to an
authorized motor service center for repair or replacement.
18" fan............4 square feet per fan
24" fan...........10 square feet per fan