Operation and Maintenance Manual Rev M(ii) 4/03
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Exhaust Fan Setup
1) Turn power OFF.
2) Open the electrical enclosure.
3) Set the overload relay current for 1.0 * FLA for the motor. The FLA is shown on the motor nameplate.
4) Set the reset button to Manual.
5) Restart the machine.
Pressure Differential Switch Setup
NOTE: The flow velocities referred to are only valid for a 5” duct diameter!!!!
1) Turn on the exhaust at 100% speed.
2) Check operation of the pressure switch input. The input should be ON with the exhaust at 100% speed.
3) Turn off the exhaust. Make sure the pressure switch input turns OFF.
4) Restrict the outlet of the exhaust until the airflow velocity is between 1800-2000 ft/min (200-220 cfm)
at the exhaust flange screen.
5) Verify that the exhaust pressure switch input is still ON. If it is not, turn the adjustment screw
counterclockwise until the input just turns ON.
6) Turn off the exhaust. Make sure the pressure switch turns OFF.
7) Turn on the exhaust. Make sure the pressure switch input turns ON. If not, turn the adjustment screw
counterclockwise again until the input turns ON. Verify that the input turns OFF when the exhaust is
turned off.
8) Restrict the outlet of the exhaust until the airflow velocity is between 1400-1600 ft/min (155-175 cfm)
at the exhaust flange screen.
9) Verify that the pressure switch input stays OFF at this airflow velocity. If the input stays ON, turn the
adjustment screw clockwise SLOWLY until the input turns OFF. If an adjustment is made, re-check
the input at the airflow velocity used in step 4. The input should still turn ON at an airflow velocity
within the range used in step 4.
10) Cycle the exhaust off and back on again. Verify that the pressure switch input stays OFF for an airflow
velocity within the range used in step 8.
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