Start-up
TruVu™ VAVB3
-E2
CARRIER CORPORATION ©2022
Installation and Start-up Guide
All rights reserved
73
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
.