Zone
Zone
VCB-X CONFIGURATION
VCB-X Operator Interface SD
50
Setpoint Screen #30 - Maximum Economizer
Position in Heat Mode
VCBX Spts ID 101
Max Econo Pos in
Heat Mode: 50%
If using Supply Air Tempering, this Setpoint allows you to set the Maxi-
mum Position the Outdoor Air Damper will open to while Heating is
operating. This takes priority over the Economizer Maximum Position
in High CO
2
Setpoint.
Description
Minimum
Default
Maximum
Maximum Economizer
Position in Heat Mode
0%
50%
100%
Setpoint Screen #31 - Minimum Outdoor
Air
fl
ow Setpoint and Deadband
VCBX Spts ID 101
Min. Outdoor Airflow
Setpt.: 2.00 kCFM
Deadband.: 200 CFM
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 #32 - Economizer Maximum
Position in High CO
2
Level
VCBX Spts ID 101
Econo Max Pos In
High Co2.: 50%
This Setpoint allows you to set the Maximum Position the Economizer
will open if high CO
2
conditions occur in the space. The Maximum
Economizer Position Setpoint is used to limit the amount of Outdoor
Air that will be introduced to the HVAC unit in order to ensure the
unit is operating within its Heating and Cooling design limitations. As
shown in the table that follows, the Minimum setting for this Setpoint
is the value previously set for the Economizer Min Position Setpoint.
CO
2
override cannot be used in conjunction with air
fl
ow control of the
Outdoor Air damper (previous screen) in this version.
Description
Minimum
Default
Maximum
Maximum Economizer
Position In High CO
2
Economizer
Min Position
50%
100%
Setpoint Screen #33 - CO
2
Setpoints Min/Max
VCBX Spts ID 101
Co2 Setpoints
Min Co2: 900
Max Co2: 1000
The Min CO
2
Setpoint is the threshold CO
2
level at which the Econo-
mizer Min Damper Position (Setpoint Screen #29) 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 #32). In between those CO
2
levels, the Economizer
Minimum Position will be proportionally reset between the values set
in Setpoint Screens #29 and #32.
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 #34 - CO
2
Altitude Setpoint
VCBX Spts ID 101
Altitude
Setpt: 1000ft
Enter the distance above sea level for the installed Carbon Dioxide Sen-
sor. 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.
VCB-X Setpoint Screens
