Manual 2100-759
Page
10 of 16
Blade Adjustment for Desired
Ventilator Air
The amount of ventilation air supplied by the
commercial room ventilator is dependent on four (4)
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 graph below to determine the blade setting
necessary to achieve the ventilation air required for
each operating mode.
Factory default settings are:
TS
TH
PP Potentiometer
Closed
Closed
OCC Potentiometer
C
C
Y1 Potentiometer
C
C
Y2 Potentiometer
C
C
Vent is factory set to supply between 100 and 150
CFM of fresh air in all modes of occupied operation.
For more accurate adjustment, use a flowhood over
the intake opening to measure and adjust the airflow
operation.
PP Potentiometer: Adjusts the airflow during pre-purge
mode (if jumper is installed in positions 30-90).
OCC Potentiometer: Adjusts the airflow during blower-
only operation, or during an occupied input from an
applicable thermostat.
Y1 Potentiometer: Adjusts the airflow during 1st stage
cooling or heating operation.
Y2 Potentiometer: Adjusts the airflow during 2nd stage
cooling or heating operation.
Energize blower-only mode and adjust OCC
potentiometer to desired airflow.
Energize 1st stage cooling mode and adjust Y1
potentiometer to desired airflow.
Energize 2nd stage cooling mode and adjust Y2
potentiometer to desired airflow.
If pre-purge mode is desired, de-energize cooling
modes. Move PP jumper to the 30-, 60-, or 90-minute
position and adjust PP potentiometer to desired airflow.
Minimum damper position when using CO
2
control
damper should be fully closed at 700 ppm or lower, if
not OCC potentiometer OCC can be adjusted counter-
clockwise (CCW) to close it. If it is fully closed at 700
ppm or lower, no adjustments required.
