Manual 2100-457D
Page
13 of 16
ADDING OPTIONAL CO
2
CONTROL
SENSOR
Adding an optional Bard Part #8403-067 to this control
will maximize the capabilities of this vent by only
supplying fresh air intake to maintain CO
2
levels. This
has multiple benefits.
• Minimizes ventilation load on structure as it only
brings in what is required to maintain CO
2
levels
lowering reconditioning requirements (not having to
heat/cool as much outside air).
• Will self-adjust for various occupancy levels so
that you are not bringing in fresh air beyond need.
For example, if a room is designed for a maximum
occupancy of 40 persons (the standard ventilation
control would have to be set for that occupancy), but
the room typically only contains 25 persons. This
control will self-adjust the amount of fresh air intake
from 600 to 375 CFM automatically (based upon 15
CFM per person standard rate to ASHRAE standards).
BASIC INSTALLATION
1. Make sure power is turned off to the unit
2. Follow steps beginning on page 2 for installation
for standard control and vent assembly, then
proceed with the following steps.
3. Run (4) wire thermostat wire from the unit to the
desired CO
2
sensor location.
4. Follow Figure 6 to configure the CO
2
sensor for
proper operation.
5. Connect the thermostat wiring from the CO
2
sensor
to step control assembly following the wiring
diagram (enclosed in Literature Assembly or on
ventilator).
6. Connect the orange wire from the “A” terminal
of the units low voltage connection strip to the
“OCC” terminal on the step control board.
7. To check operation, restore power to the unit.
8. Make sure that thermostatic control is in
“occupied” mode of operation calling for
ventilation.
9. Have someone stand in front of the CO
2
sensor and
breathe on it. The display should show an increase
in CO
2
ppm and the damper blade in the ventilation
package should increase (may be good to have a
helper - one to breathe on control and one to
observe damper).