Manual 2100-667
Page
14 of 19
BLADE ADJUSTMENT FOR DESIRED
VENTILATOR AIR
The amount of ventilation air supplied by the
commercial room ventilator is dependant on four
factors.
1. Return air duct static pressure drop.
2. Supply air duct static pressure drop.
3. Indoor blower motor speed.
4. Damper blade open position setting.
Refer to the appropriate graph below and on the
following pages to determine the blade setting
necessary to achieve the ventilation air required for
each operating mode.
Factory Default Settings
Potentiometer R1: 3
Potentiometer R2: 6
For more accurate adjustment, use a flowhood over
the intake opening to measure and adjust the airflow
operation.
Potentiometer R1 Adjusts the minimum constant
airflow during occupied conditions
Potentiometer R2 Adjusts the airflow on a contact
closure for demand ventilation
Energize occupied condition mode and adjust #1
Potentiometer to desired airflow.
Energize demand ventilation mode and adjust #2
Potentiometer to desired airflow.
Minimum damper position when using CO
2
control
damper should be at minimum occupied airflow at 700
ppm or lower; if not, Potentiometer R7 can be adjusted
clockwise (CW) to close it. If it is fully closed at 700
ppm or lower, no adjustments are required.
GRAPH 1
W18AA Part Flow Ventilation Delivery