Space temperature alarming - 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:

  • Space temperature alarm setpoint offset (STAlarmOffset)
  • Space temperature alarm time delay (STAlarmDelay)
  • CV operational cooling setpoint (OprCVCgl-Sp)
  • CV operational heating setpoint (CVOprHtg-Sp)

Inputs

The input for space temperature alarming is operational space temperature (OprST).

Operation

If either the space temperature alarm offset setpoint or the space temperature alarm time delay are set to 0, the space temperature alarming function is disabled.

After 10 minutes of cooling operation, if the operational space temperature is greater than the CV operating cooling setpoint plus the space temperature alarm setpoint offset, the space temperature alarm time delay timer starts. If the timer expires, a space temperature alarm occurs.

After 10 minutes of heating operation, if the operational space temperature is less than the CV operating heating setpoint plus the space temperature alarm setpoint offset, the space temperature alarm time delay timer starts. If the timer expires, a space temperature alarm occurs.

If the operational space temperature moves within the CV operating cooling/heating setpoint plus the space temperature alarm setpoint offset, the space temperature alarm time delay timer is reset to 0. If the operational space temperature does not move to the setpoint for another 10 minutes, the timer starts again.