OPERATOR'S MANUAL BIOPROtect II Vent to ... - Baker Company

The Airflow Balance! Warning !This procedure should be performed by qualified technicians only.The airflow balance which is set at the factory provides your unit with the air volume and velocity controlto minimize leakage or airborne contamination either in or out of the work area.In order to duplicate as closely as possible the airflow characteristics described in the original factory testreport, please follow these steps:1. Make certain that the front doors and viewscreens are closed and secured so as to make two 8” x 42”horizontal access openings.2. Using a DIM (Direct Intake Measurement) on each 8” X 42” horizontal access opening at the same time,measure the flow rate into each of the front access openings. Take at least five (5) consecutive readings perside. Average the readings and divide by 2.3 square feet (area of each front access opening). Acceptablerange of the average shall be 100-110 FPM.3. Using a hot wire anemometer mounted on a ring stand within the work area, take readings with theanemometer probe set 6” below the diffuser. The location of these readings should be the same as shown inthe factory test report. The average of these velocity readings must be in the range between 50 and 70 FPM.4. After you have compared your figures with those originally taken at the factory, make whateveradjustments are necessary. Use the motor speed controls and the exhaust dampers to bring the intake anddownflow average values within the specifications.! Warning !When the light canopy is lowered, some electrical parts are exposed. Do not perform this work unless you are aqualified and trained electrician or electrical technician.! Warning !Terminals M1 and M2 as well as L1 and L2 are High Voltage5. As the HEPA filters load up with particulates, airflow will be maintained automatically to some extent.When the air flow is diminished you will have to increase the motor speeds to maintain the specified intakeand downflow velocity averages. This is done via the speed controllers located in the light canopy.On the speed controller, turn the potentiometer clockwise until you have the desired airflow. Use avoltmeter to check the voltage across terminals M1 & M2. This is the voltage out to the motor. If the airflowcannot be maintained, it will necessary to replace the HEPA filters.(See “Procedure for HEPA Filter Replacement” later in this section.).Page 18 of 54