Sequence of Operation
Maximum Airflow Flow [MaxAFpos] (as set per AV 3)
The
maximum airflow flow setting can be set to a value no higher than 4999 CFM. When setting airflow, refer to the box/damper manufacturer rating for the correct
size actuator motor. The actuator motor that is installed onboard the BZ424 is rated at 45 in-lb.
For assistance in calculating in-lb values you can use this guide from belimo.
https://www.belimo.com/mam/americas/technical_documents/Support%20material/how_to_size_a_damper_actuator.pdf
Minimum Airflow Flow (Heating) [When central system is in cooling] (as set per AV 5)
For boxes that are shut off only, or fan powered (either series or parallel) the heating minimum setting should be the same as the cooling minimum flow setting. Shut
off boxes do not have the capability to heat and should not provide any less air than is required for ventilation. Fan-powered boxes will bring in return air to provide the
required airflow for proper heating of the zone. Shut off boxes with reheat should have the heating minimum flow setting set at the level required for proper heating of
the zone. This value is typically higher than the minimum cooling flow setpoint. In normal operation the box will modulate from maximum flow down to minimum
cooling flow as there is less call for cooling, then will open to the heating minimum flow and open the heating coil on a call for heat.
Minimum Airflow Flow (Cooling) [When central system is in Heating] (as set per AV 6)
The minimum cooling flow should be set based on the ventilation requirements for the zone based on the requirements of ASHRAE 62 or local codes. The minimum flow
setting should be the same regardless if the box is configured as cooling only, cooling with reheat, or fan-powered.
zRuntime (as set per AV 0)
This setting is used to adjust the run time of the internal airflow actuator only. The default is 95 seconds.
The runtime for any of the external BOs is adjustable using Onyxx LX only via a Private VAR when applied using a floating output BO1/BO
-2 or BO3/BO4. The default is
95 sec. There is a reference to AV-46 thru 50 but this does not write to the Private VAR. Do not write to these AVs in BACnet to adjust the runtime. Adjustment is
solely through the Onyxx LX UI.
www.lynxspring.com
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Power
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