Zone Environmental Index - Carrier TruVu VAVB3-E2 Installation And Startup Manual

Zone Environmental Index

The i-Vu® Control System uses Environmental Index (EI) to calculate a real-time numerical EI value for a zone
based on ideal Occupied space temperature, optional relative humidity (RH) and/or CO2. Environmental Index
determines the source(s) derating the EI value by continuously evaluating Occupied zone conditions. EI Decreased
By displays the source(s) derating the EI value. The EI Space Temp Setpoint Tolerance 0.5 °F (0.28 °C) is
subtracted from Effective Heat Setpoint and is added to Effective Cool Setpoint, expanding the ideal EI
temperature sensitivity range. The EI is derated from the initial Occupied value of 100% if the space temperature
deviates from the ideal EI temperature sensitivity range.
NOTE The EI Space Temp Setpoint Tolerance does not affect the controlling space temperature Effective Heat
Setpoint or Effective Cool Setpoint.
The optional RH and/or CO2 values derate the EI value when they deviate from their setpoints.
•
If RH Control is set to Enable, the EI is derated when the RH value is less than the EI Humidity Low Limit or
when the RH value is greater than the Occupied RH Control Setpoint.
•
If DCV Control is set to Enable, the EI is derated by CO2 if the value exceeds the DCV Max Ctrl Setpoint.
If a zone is Unoccupied, the EI will calculate a value of 0%.
EI Time Satisfied is the percentage of Occupied time which a zone maintains an EI value of 70% or higher.
Weighted EI determines the priority of a zone in an EI roll-up, which must be completed using a different control
program. The value is determined by multiplying the real-time EI value by the EI Weighting Factor.
TruVu™ VAVB3-E2
Installation and Start-up Guide
73
Start-up
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