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22 PNEG-524 Roof Exhaust Fan
8. OPERATING INSTRUCTIONS
If the fan just hums when turned ON, check the following:
1. Check to make sure that all leads of your power source have voltage present. If fan unit is
not receiving power on all leads, check for a blown fuse, broken wire or loose connection.
2. Check to see that all contact sets are closing. If one leg of the supply voltage is not available
to the motor it will hum.
3. If power is available at all motor leads, and the motor still hums, it should be taken to an
authorized service center for repair or replacement.
If the fan starts and operates for awhile and then shuts OFF, check the following:
1. Check the supply voltage. Voltage should be within +/-10% of rated voltage. For example,
a motor rated at 230 volt should operate in a voltage range of 207 to 253 volt.
2. Check the supply wire size required for the fan unit.
3. Check the load on the main circuit to make sure other items on it are not overloading the
fan circuit.
4. Check the amperage of the fan, if the unit is pulling above name plate amperage, take the
motor to an authorized service center.