Operational outdoor air temperature - 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 temperature (OprOAT)
  • Outdoor air temperature source (OATSrc)

Inputs

The inputs include the following items:

  • Network override outdoor air temperature (NetOAT) communicated value on FC bus
  • Outdoor air temperature input (OAT) to OAT terminals

Operation

The highest valid priority input is used for operational outdoor air temperature. The operational outdoor air temperature has assigned priority for inputs in the following order from highest to lowest:

  • Network override outdoor air temperature (NetOAT)
  • Outdoor air temperature input (OAT)

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

The outdoor air temperature source describes the input in use for the operational outdoor air temperature, and the indications include the following items:

BAS Override
Indicates the network override outdoor air temperature
Local Input
Indicates outdoor air temperature input
Unreliable
Indicates no valid input is available and control functions that use operational outdoor air temperature (OprOAT) are not permitted

The network override space setpoint offset is used if a value is set or communicated within the last 15 minutes. If 15 minutes pass without a communicated value, the UI displays Value Timed Out and the next highest priority input is used.

The outdoor air temperature input (OAT) is used if the temperature sensor is connected to the OAT pins.