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Appendix A: VAV Zone II Points/Properties
Point Name/Description
RH Sensor Value @ Max Volts – The % relative humidity that correlates to the hardwired
RH sensor's high voltage reading.
CO2 Sensor Min Input Volts – The lowest voltage that should be read from the
hardwired CO
sensor.
2
CO2 Sensor Max Input Volts – The highest voltage that should be read from the
hardwired CO
sensor.
2
CO2 Sensor Value @ Min Volts – The ppm value that correlates to the hardwired CO
sensor's low voltage reading.
CO2 Sensor Value @ Max Volts – The ppm value that correlates to the hardwired CO
sensor's high voltage reading.
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 Built-in
flow sensor.
Damper Actuator - The damper type used by the equipment. Leave as Built-in
actuator.
VAV Zone II Controllers
Installation and Start-up Guide
2
2
84
Default/Range
D:
100%
R:
0 to 100%
D:
1.00 V
R:
0 to 5.00 V
D:
5.00 V
R:
0 to 5.00 V
D:
0 ppm
R:
0 to 9999 ppm
D:
2000 ppm
R:
0 to 9999 ppm
D:
0%
R:
0 to 100%
D:
Built-in flow sensor
D:
Built-in actuator
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