Optional Features (VAV-DD) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 15.0

Controller Tool Help

Johnson Controls
Product name
Controller Configuration Tool
Document type
User Guide
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The Optional Features selections provide Network Input modules for supervisory system interfaces to override the main applications sequence of operation through connections to the appropriate Setpoint/Miscellaneous modules or State Generators.

The selection choices for Optional Features are:

  • Smoke Control Support (UL-864-UUKL): This option adds the Emergency Mode Network Input and the Smoke Control Sequencing for UL-864-UUKL State Generator module. In the State Selection Table, you can create state values for each Output Controller to provide normal control, pressurize, depressurize, purge, or shutdown. For example, if the Emergency Mode Network Input is set to shutdown, you can set all of the Output Controller states to the desired condition in the State Selection Table.

  • Unit Enable: This option determines whether the application operates based on the Network Input (BV). If Unit Enable Switch is selected in the Misc (VAV-SD) section, then when the Network Input does not have a valid command from the network, it is considered unreliable (and the unit is enabled). If both BI and BV are selected, the state of both must be Enable for the unit to operate (that is, either input can be in a shutdown state to cause the unit to stop).

  • Power Fail Restart Logic: This feature is available as part of the Unit Enable Determination State Generator module. When this option is selected, after a restart (power cycle, transfer to the controller, or manual restart command), the application is held in the shutdown state for the Power Fail Restart Time (default = 60 seconds).

  • Energy Hold Off: This option allows the unit to shut down based on the energy hold off Network Input. If Energy Hold Off Switch is selected in the Misc (VAV-SD) section, then the Network Input or the Hardware Input (BI) can activate the mode. This feature is typically used to shut down the temperature and airflow control when a window or loading door is open (for example, a window switch).

  • Network Warmup-Cooldown Support: This feature provides warm-up by using the hot duct to warm up the space. This feature is often used first thing in the morning on cool days before occupants arrive. The cold duct damper is kept at its minimum flow while the hot duct damper controls the space temperature. Warm-up is triggered based on writing to the Network Input to command the controller into warm-up.

  • Zone Low Limit Support: This feature is typically used with the Energy Hold Off feature to cycle heating On when the temperature falls below a low limit.

  • Summer-Winter Compensation Setpoint Shift: This option allows the zone setpoints to be automatically adjusted based on the outdoor air temperature. This feature is often used for entry zones, such as an atrium, that feel comfortable at warmer or cooler temperatures because occupants usually enter from much warmer or cooler conditions. For example, if the outdoor air temperature is 20°F (-7°C), the atrium temperature may be kept at 65°F (18°C) rather than 69°F (21°C) because occupants wear heavier clothing as they come in from or go to the outdoors.

The following optional features are only available in a Guideline 36 configured application:
  • System Request Generation (G36): This feature provides support for cooling temperature requests, heating temperature requests, hot duct and cold duct pressure requests, and an option for request accumulation. Cooling reset, cooling plant, heating reset, heating plant requests, cold duct pressure requests, and hot duct pressure requests are added as network outputs that can be mapped to supervisory control.
  • System OK (G36): This feature determines whether the VAV is in an OK state. The system is considered OK when it is proven on, it is achieving its temperature or pressure setpoints(s) for at least 5 minutes, and it is ready and able to serve its load, it is not in a state of startup or alarm.
  • Warmup-Cooldown (G36): This feature provides a return time calculation module. The serving engine uses the largest return time of a zone group to determine if they system should enter Warmup or Cooldown mode.
  • Terminal Unit Alarms (G36): This option provides modules for the following alarms:
    • Airflow Sensor Alarming
    • Low Airflow Alarming (requires Total Flow Only (G36) selected)
    • HD Low Air Flow Alarming
    • CD Low Air Flow Alarming
    • Leaking Damper Alarming
  • Generic Thermal Zone Alarms (G36): This option provides modules for the following alarms:
    • High Temperature Alarming
    • Low Temperature Alarming
    • CO2 Alarming (requires CO2 sensor selected)