Carrier TruVu VAVB3-E2 Installation And Startup Manual page 129

Point Name/Description
Min% Heat airflow when AHU Heating - Increases the airflow to the zone and overrides
the configured minimum airflow value whenever the air source is in a heating mode. If
set to 0%, no override is active and the Occupied or Unoccupied Min Airflow value is
used.
This is not a direct percentage of the Max Heat cfm.
To calculate the Min% Heat airflow when AHU Heating configuration, when based on
the Heating Max cfm, Occ Min, and the desired heat minimum airflow cfm, use the
formula Min% Heat airflow when AHU Heating = (Heat Min – Occ Min) / (Heat Max –
Occ Min).
Variables:
•
Heat Min = Desired Heating Minimum cfm when AHU Heating
•
Heat Max = Heating Maximum cfm
•
Occ Min = Occupied Minimum cfm
•
Min% Heat airflow when AHU Heating = configuration value in % to achieve min
airflow in AHU heat mode
NOTE These formulas do not generate an exact Heat Min cfm value, but will generate a
value that should maintain the desired Heat Minimum Airflow, whenever the AHU is in a
Heating Mode. To disable any increase in airflow during AHU Heating, set the Heat Min
value to 0%.
To calculate the minimum heating cfm when the AHU mode is Heat, use the formula
below to get the resulting Min Heat cfm when in the occupied mode:
Heat Min = [Min% Heat airflow when AHU Heating * (Heat Max - Occ Min)] + Occ Min
Flow Control:
Click Flow Control to access the microblock popup Properties page > Summary and
Details tabs. See the microblock Help for more detailed explanations.
Flow sensor - The airflow sensor type used by your equipment. Leave as Integral –
onboard.
Damper Actuator - The damper type used by the equipment. Leave as Integral –
onboard.
Flow Measurement Units – The flow measurement output. Do not change the
default of cfm (liters/second).
Damper Motor Travel Time – The actuator's travel time from full closed to full
open. Leave this field at 154 seconds.
Direction Clockwise – If Damper Actuator is set to Integral – onboard, set this
field to the damper's position when it rotates clockwise.
TruVu™ VAVB3-E2
Installation and Start-up Guide
Appendix A: TV-VAVB3-E2 Points/Properties
123
Default/Range
D: 0%
R: 0 to 100%
D: Integral – onboard
R: Integral – onboard
Integral – remote
External
D: Integral – onboard
R: Integral – onboard
Integral – remote
External
D: cfm (liters/second)
D: 154 seconds
D: Open
R: Close/Open
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