Forma Scientific, Inc.__________________________________________________Maintenance
8-2
1. Layout test grids (refer to Sections 8.4 and 8.5).
2. Start-up the cabinet and allow it to run for at least twenty minutes.
3. Take airflow measurements. If airflow specifications are not sufficient, open the control
panel and check the voltage on the power switch. Note: airflow measurements at the
factory are recorded with the cabinet connected to a 115 volt power supply.
4. Locate the triac board in the upper left hand corner (behind control panel). Measure (using
a true RMS Voltmeter) and record the voltage drop across the white and black wire
leading to the terminal strip. The voltage pot is located on the lower right side and is
labeled "Voltage Pot". Clockwise adjustment of this pot increases voltage supply to the
blower motor. Adjust 2-3 volts accordingly (either up or down, depending upon the
airflow required). Retake the airflow measurements.
If it is determined that the damper must be adjusted in order for the proper airflow
balance to be maintained, adjust it as follows.
1. The damper adjustment is located above the supply diffuser screen (toward the left back
wall) and is labeled "Damper Adjust Access".
2. The sprocket adjustment wheel is numbered from 0 to 9. 0 is fully closed when the
adjustment wheel is turned fully clockwise. 9 is fully open when the wheel is turned fully
counterclockwise.
3. Note the position (from 0-9) on the damper adjust sprocket. With a screwdriver or similiar
tool, turn the adjustment wheel clockwise to fully close the damper. Damper adjustments
must start from the fully closed position.
4. Example: If the present position is 4 and the supply velocity is High and the exhaust
velocity is Low, adjust the damper sprocket fully closed (0) and then to approximately 5.
Re-take airflow readings and repeat until the correct airflow balance is achieved.
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