Operational space temperature setpoint offset - Johnson Controls - LIT-12011950 - Building automation software - Smart Equipment Controller - 5.0

Smart Equipment Controls Sequence of Operation Technical Bulletin

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

Setpoints and related data

The setpoints and related data include the following items:

  • Operational space temperature setpoint offset (OprSSO)
  • Space temperature setpoint offset source (SSOSrc)
  • Space temperature setpoint offset range (SSORange)
Note: Offsets apply only to occupied setpoints.

Inputs

The inputs include the following items:

  • Network override space setpoint offset (NetSSO) communicated on the FC Bus
  • Net sensor space temperature setpoint offset to the SA Bus
  • Space temperature offset input (SSO) to SSO and COM terminals

Operation

The space temperature setpoint offset range sets the maximum amount a net sensor space setpoint offset or the space temperature setpoint offset input can offset the operational space temperature setpoint offset (OprSSO). The selectable range is 0.0°F to 5°F in 0.1°F increments.

Note: The network override space setpoint offset is not bound by the space temperature setpoint offset range (SSORange).

The highest valid priority input is used for the operational space temperature setpoint offset (OprSSO). The operational space temperature setpoint offset assigns priority levels for inputs in the following highest to lowest order:

  • Network override space setpoint offset (NetSSO)
  • Net sensor space setpoint offset
  • Space temperature setpoint offset input (SSO)

If the input in use becomes invalid, the operational space temperature setpoint offset (OprSSO) reverts to the next highest priority input.

The space temperature setpoint offset source (SSOSrc) describes the input in use for the operational space temperature setpoint offset (OprSSO), and the indications include the following items:

BAS Override
Indicates the network override space setpoint offset (NetSSO)
Network Sensor
Indicates a net sensor
Local Input
Indicates a space temperature offset input (SSO)
Unreliable
indicates no valid input is available and CV occupied cooling setpoint (ClgOcc-Sp) and CV occupied heating setpoint (CVHtgOcc-SP) are not offset

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, then the UI displays Value Timed Out and the next highest priority input is used.

The net sensor space setpoint offset is used after approximately 30 seconds from the time a net sensor with space temperature setpoint offset capability is connected to the SA Bus.

The space temperature setpoint offset input is used if the space sensor is connected to the SSO and COM terminals.

If a valid input is not available for the operating space temperature setpoint offset, the CV occupied cooling setpoint (ClgOcc-Sp) and the CV occupied heating setpoint (CVHtgOcc-SP) are not offset.

The operational space temperature setpoint offset (OprSSO) value is either added to or subtracted from both the CV occupied cooling setpoint and the CV occupied heating setpoint.

The CV operating cooling setpoint and the CV operating heating setpoint are determined by the current occupancy mode. See Setpoint determination for additional information.