Demand Control Ventilation Application and Sequence (as set per AV 66 and private VAR using SLC software interface)
If the current CO2 measured reading from AV-65, the selected zone sensor which is selected from the private VAR using SLC software interface
[app config/Dewpoint and CO2 tab]
exceeds the CO2 setpoint [AV66], the damper will open to the maximum position and if equipped and configured for series fan, the fan will increase to 100% if using a Modulating Fan or
On if Fan is On/Off type.
C02 input location can be configured using a TZ200 series controller, an analog input [1-4] 0-10vdc [0-2000ppm fixed scale]. (Using the private VAR using SLC software interface)
Multiple CO2 Sensors from BZ424 Controllers that are controlling to a single RTU/AHU using a B[P]848 series controller
Multiple CO2 Sensors Controlling a Single AHU: Control will be based on the highest CO2 concentration measured in all spaces served by the air handler.
Please refer to the B[P] 848 series controllers Installation and user guide Demand Control Ventilation Application and Sequence for additional details.
Condensate Avoidance Application and Sequence (as set per MSV-43, 70, 71 and AV 68, 69 & 71)
If the condensate detector [BV-5] indicates the presence of condensate in the drip pan, the BZ controller will close the chilled water damper valve and continue operating the fan and
damper as normal. The BZ controller will return to normal operation when condensate is no longer detected.
If the measured zone dewpoint (which requires a Humidity input] exceeds the entering chilled water temp (this must be selected to utilize this sequence) the BZ controller will close the
chilled water damper valve and continue operating the fan and damper as normal. The BZ controller will return to normal operation when the zone dew point is less than 5 ℉ below the
entering chilled water temperature.
If the zone dewpoint rises above the dewpoint high limit, the ventilation damper will be modulated further open until the zone dewpoint drops back below the dewpoint low limit.
Sequence of Operation
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