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.