VCC-X Operator Interface SD
VCC-X SETPOINTS
49
Setpoint Screen #32 - Minimum Outdoor
Air
fl
ow Setpoint & Deadband
VCC-X Spts ID:#
Min. Outdoor Airflow
Setpoint.: 2.00kCFM
Deadband.: 200CFM
If controlling the Outdoor Air Damper to an air
fl
ow setpoint, this
screen allows you to set the design Minimum Outdoor Air CFM
Setpoint. The Deadband controls the rate of change for the damper
signal. As OA CFM moves further from setpoint within this window,
the damper makes a larger change.
Description
Minimum
Default
Maximum
Minimum Outdoor
Air
fl
ow Setpoint
0.10 kCFM
2.00 kCFM
200 kCFM
Deadband
10 CFM
200 CFM
9999 CFM
Setpoint Screen #33 - Max Damper Position or
CFM Value in High CO
2
Level
VCC-X Spts ID:#
High CO2
Max OA kCFM: 2.0
Max Econo Pos.: 50%
If doing air
fl
ow control of the outside air (OA) damper, the Max
OA KCFM Setpoint (K = 1000) is the maximum air
fl
ow that the
unit will provide during IAQ CO
2
override operation when the CO
2
level is equal to or greater than the Max CO
2
Setpoint.
Under this control, the OA damper will not open more than the Max
Econo Position, so that should be set to 100% so as not to limit the
CFM control. If not doing air
fl
ow control, only use the Max Econo
Position to limit the damper during high CO
2
operation.
Description
Minimum
Default
Maximum
Max OA kCFM
.10 kCFM
2.0 kCFM
200 kCFM
Maximum Econo-
mizer Position In
High CO
2
Economizer
Min Position
50%
100%
Setpoint Screen #34 - CO
2
Setpoints Min/Max
VCC-X Spts ID:#
CO2 Setpoints
Min CO2: 900ppm
Max CO2: 1000ppm
The Min CO
2
Setpoint is the threshold CO
2
level at which the Econo-
mizer Min Damper Position (
Setpoint Screen #30
) will begin to be
reset higher. The Max CO
2
Setpoint is the CO
2
level at which the
Economizer Min Damper Position will be reset to the Econo Max
Pos In High CO
2
(
Setpoint Screen #33
). In between those CO
2
lev-
els, the Economizer Minimum Position will be proportionally reset
between the values set in
Setpoint Screens #30 and #33
.
Description
Minimum
Default
Maximum
Minimum CO
2
Level
0 PPM
900 PPM
2000 PPM
Maximum CO
2
Level
0 PPM
1000 PPM
2000 PPM
Setpoint Screen #35 - CO
2
Altitude Setpoint
VCC-X Spts ID:#
Altitude
Setpoint: 1000ft
Enter the distance above sea level for the installed CO
2
Sensor. Altitude
correction is required for valid readings if you are above 500 feet. High
limit = 15,000 feet; Low limit = 0 feet.
Description
Minimum
Default
Maximum
Altitude Setpoint
0 Feet
1000 Ft.
15,000 Ft.
VCC-X Setpoint Screens
