Operational outdoor air quality - Johnson Controls - LIT-12011950 - Building automation software - Smart Equipment Controller - 5.0

Smart Equipment Controls Sequence of Operation Technical Bulletin

Brand
Johnson Controls
Product name
Smart Equipment Controller
Document type
Technical Bulletin
Document number
LIT-12011950
Version
5.0
Revision date
2024-06-06
Product status
Active
Language
English

Setpoints and related data

The setpoints and related data include the following items:

  • Operational outdoor air quality (OprOAQ)
  • Outdoor air quality source (OAQSrc)
  • Outdoor air quality sensor range (OAQRange)

Inputs

The inputs include the following items:

  • Network override outdoor (NetOAQ) communicated value on the FC Bus
  • Outdoor air quality (OAQ) to OAQ terminals

Operation

Operational outdoor air quality (OprOAQ) is effective only if an economizer board has been connected to the UCB and a related input has been present following the last RELEARN SYSTEM (Relearn) operation. The operational outdoor air quality (OprOAQ) parameter is then shown in the UCB display menu. The network override outdoor air quality (NetOAQ) parameter is only shown in the UCB display menu if an economizer board is connected to the UCB and triggers the economizer board presence indicator.

The highest priority valid related input is used for operational outdoor air quality (OprOAQ).

The operational outdoor air quality (OprOAQ) has assigned priority for inputs in the following order from highest to lowest:

  • Network override outdoor air quality (NetOAQ)
  • Outdoor air quality (OAQ)

If the input in use becomes invalid, operational outdoor air quality (OprOAQ) reverts to the next highest priority input.

Outdoor air quality sensor range (OAQRange) must be set to match the ppm range of the sensor being used. This allows the control to properly calibrate the 0 to 10 VDC input from the sensor to match the actual ppm measured by the sensor.

Note: Network override outdoor air quality (NetOAQ) is not bound by the outdoor air quality sensor range (OAQRange)

Outdoor air quality source (OAQSrc) describes the related input in current use for operational outdoor air quality (OprOAQ):

BAS Override
Indicates network override outdoor air quality (NetOAQ)
Local Input
Indicates outdoor air quality sensor (OAQ)
Unreliable
Indicates no valid related input is available for and the differential demand ventilation economizer function that uses operational outdoor air quality (OprOAQ) is not permitted

Network override outdoor air quality (NetOAQ) is used if a value is set or communicated within the past 15 minutes. If 15 minutes pass without a communicated value, the UI displays Value Timed Out and the next highest priority input is used.

Outdoor air quality input (OAQ) is used if the OAQ sensor is connected to the OAQ and COM terminals.