Manual 2100-760
Page
8 of 17
9. Connect leads with fork terminals to corresponding
points on unit terminal strip. (See manual 2100-
507 for air conditioner connection diagrams or
manual 2100-516 for heat pump connection
diagrams.)
10. Close control panel cover.
11. Replace left filter support, filter and four (4)
screws in condenser grille.
12. Re-install the blower access panel at top of unit
and secure with sheet metal screws.
13. Ventilator checkout:
A. Remove mist eliminator to allow access to
minimum position thumbwheel or blade stops.
B. Resupply power to unit.
C. Energize the evaporator blower by switching
thermostat to the manual fan position with
heat/cool in OFF position.
D. Ventilator should open to the position set
by the OCC potentiometer on the CRV
control board located on the top of the vent
(see Figure 5). On the CRVS, cycle OCC
potentiometer to full open through full close.
Observe damper blade operation throughout
travel to assure free, unobstructed movement.
E. De-energize evaporator blower. Damper blade
should close.
F. This completes ventilator checkout.
14. Adjust damper blade for required ventilation airflow
in blower only, stage 1, and stage 2 cooling/heating
mode (see
Blade Adjustment for Desired
Ventilation Air
).
15. Replace mist eliminator. Be sure it is installed
with the drain holes to the bottom.
16. Remove blank off plate or barometric fresh air
damper installed on service access door. Plug four
(4) mounting holes with the plastic plugs provided
with the ventilator.
17. Replace service access panel.
18. Ventilator is now ready for operation.
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:
PP Potentiometer
Closed
Closed
OCC Potentiometer
B
B
Y1 Potentiometer
B
B
Y2 Potentiometer
B
B
Vent is factory set to supply between 100 and 200
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 potentiometer OCC can be adjusted counter-
clockwise (CCW) to close it. If it is fully closed at 700
ppm or lower, no adjustments required.
