Viconics VZ7656E Installation Guide - Manual (Page 30)

30 | VZ7656E1000W Installation Guide
Economizer Mode, CO
2
Level Control and Fresh Air Measurement Station
If the fresh air damper is to be used for both free cooling and CO
2
level control with a fresh
air measurement station, only the Min FA, Max FA, Min CO
2
and Max CO
2
parameters as
well as the free cooling sequence will be active.
- The FA Range parameter should be set to something other than 0 CFM.
- Use an air flow transmitter to read fresh air level with AI2 input (0-5 VDC
input)
- Min FA, Max FA, Min CO
2
and Max CO
2
parameters should be set according
to the required setting.
T HE HIGHEST VALUE BETWEEN FREE COOLING DEMAND OUTPUT AND INTERPOLATION OUTPUT
FOR THE FRESH AIR SETPOINT BASED ON THE CO2 LEVEL WILL BE THE OUTPUT TO THE FRESH
AIR DAMPER
Min FA
Setpoint
Max FA
Setpoint
Min CO
2
Max CO
2
Current
FA Setpoint
Current CO
2
Level