Labconco PuriCare Vertical Flow Stations 3830020 - Manual (Page 36)

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Chapter 6: Maintaining Your PuriCare
6. Using a thermal anemometer, measure the velocity
at the center of each of the squares.
7. Average the readings. Multiply the average
velocity by the correction factor 2.25 to obtain the
average inflow volume.
8. The average inflow volume, corrected for local
conditions, should be 650-670 CFM.
Speed Control Adjustments
The Vertical Flow Station blower
speeds should only be adjusted by a
qualified certification technician.
Adjustment of the impeller and/or
blower speeds will affect the
containment of the unit.
The Vertical Flow Station uses two
independent speed controls to control
the upper impellers (Supply Air) and
the lower Motor/Blower (Exhaust Air)
1. Locate the two plugged speed control access holes
located on the lower front panel as shown in Figure
6-4.
2. Gently pry out the chrome plugs to gain access to
the speed control adjustment screws. The screw on
the bottom controls the lower Motor/Blower, the
one on the top controls the upper impellers.
3. Turn the screw(s) counterclockwise to increase the
speed, clockwise to decrease it.
Turning the speed control adjustment
screw all the way counterclockwise
will shut the speed control circuit off
and the motor(s) will stop. If this
occurs, turn the screw clockwise until
the motor(s) start running again.
4. After adjusting the appropriate speed control,
measure the downflow velocities or Inflow Volume
as needed.
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