Primary States (Loss of Airflow Sequencing) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 13.1

Controller Tool Help
Product
Controls > Control Tools > Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
13.1
Revision date
2019-12-04

  • Normal: This is the normal operational state that results when the command sent to the output controller agrees with the both the Air Proving Switch and the Supply Flow. During start up of the unit, the sequencer transitions to either Self Reset Fault or Manual Reset Fault if the Air Proving Switch does not detect flow within the Delay time.

  • Low Flow: This state is reached when the Supply Fan is commanded on and the Supply Flow is less than the Min Air Flow Setpoint. This state is reached only in systems with Electric Heat.

  • Self Reset Fault: This state is reached when the Supply Fan is commanded On and the Air Proving Switch does not detect flow and the sequencer has been configured as a Self Reset system (Restart Config is False.) The sequencer transitions to Normal if the Air Proving Switch detects flow for more than the Flow Debounce time.

  • Manual Reset Fault: This state is reached when the Supply Fan is commanded On and the Air Proving Switch does not detect flow and the sequencer has been configured as a Manual Reset system (Restart Config is True.) The sequencer transitions to Normal by issuing a Trigger command through the Manual Restart or Network Restart.