Hi-Vol Motor Replacement and Calibration

 

Purpose:  The procedure below is to give explanation on how to replace a Hi-Vol motor.  When replacing a motor it will have to be calibrated before going back in service.

 

Items needed:  New motor

                            Crescent wrench

                            Medium phillips head and flat blade screwdriver

                            Calibration orifice

                            Monometer

 

Reference:  Tisch Environmental Hi-Vol Operations Manual pages 6-17.

 

 

Motor change out

 

  1. Unplug the machine.
  2. Open up the front and disconnect the black flow tubing from the chart recorder.
  3. Disconnect the power cord for the motor and take the exhaust tube off of the motor housing.
  4. Open the top and take the filter and filter plate out.
  5. Pull up on the filter screen and the motor will come with it.  Make sure that you take the flow sensor off as soon as you are able to reach it.
  6. You should be able to pull the motor housing and filter screen out now.  It is one complete piece.
  7. After pulling it out, disconnect the filter screen plate from the motor housing.  There are four screws that hold it together.  When the two plates separate there will be a rubber gasket.  Make sure you save it to use for reinstallation. Be careful, with the two plates apart the motor will fall out.
  8. Loosen the knurled nut that holds the power cord in place and push the cord through as far as possible.
  9. Now you can pull the motor from the housing.
  10. Disconnect the wires and replace the motor.  Make sure you take the rubber seal and aluminum plate off of the old motor before you connect the wiring.
  11. Install the new motor, then its housing and then the filter screen.
  12. When everything is back in place connect the power cord for the motor and plug the main unit in.  DO NOT put the black flow tube back on to the chart recorder.

 

 

Calibration of new motor

 

  1. Put the flow orifice in place where the filter goes and hang your monometer on the side of the Hi-Vol housing.
  2. Turn the orifice to the fully open position and turn the “timed/off/on” switch to “on” so that the Hi-Vol starts running.
  3. Connect the tubing on the orifice to the monometer.  Connecting the tubing to either side will give you the same results.  Which ever side you choose, make sure you use it for the entire calibration.
  4. The monometer has liquid in it that will rise and fall on each side depending on the flow.
  5. Adjust the flow orifice using the valve on the top side so that the two sides of the monometer added together equal 9.5.
  6. Write the value from each side of the monometer on to the Hi-Vol calibration form under the “Orifice” heading.  The form is attached to the bottom of this procedure.
  7. Pull the orifice tubing off of the monometer and put the black tubing from the motor housing onto the monometer.
  8. Write the value from each side of the monometer on to the Hi-Vol calibration form under the “Motor” heading.
  9. Repeat steps 18 – 21 for set points 8.0, 6.75, 4.5 and 2.0.
  10. The cal form should have all five points filled in for both the Orifice and Motor.  Make sure you input the values for both the Left and Right side of the monometer.
  11. Write the current pressure and temperature on to the Hi-Vol calibration form.
  12. Fax a copy of the motor calibration form to Plano.
  13. Push the motor housing tubing back on to the chart recorder and replace the chart.
  14. Install a new filter.
  15. Check the time and adjust it if needed.
  16. Set up the machine for the next run date.
  17. Reset the run time so that it reads 0.0.
  18. After the calibration and set up is complete put the “start day setting” in the correct position and put the “timed/off/on” switch into the “timed” position.

 

 

Example calibration form:

 

 

 

 

 

 

 

 

 

 

 

The blank calibration form does have calculations imbedded in it.