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.
Summary of Contents for PVA2000
Page 9: ...Notes ...