NIST APAR3 – Heating coil valve command is fully open and SAT error exists (Mode 1 – Heating)
Applicable Systems
NIST: APAR3
Primary: AHU, RTU, MUA, ERV
Objective/Method/Outcome
Objective: Indicates that the heating coil valve is fully open and the SAT is less than the setpoint while the AHU is in Mode 1 (Heating).
Method: Check if the SAT is more than 2 degrees below set point for over 8 occupied hours per week while the unit is in Mode 1 (Heating).
Outcome: An insight is generated when the SAT is more than 2 degrees below set point for over 8 occupied hours per week while the unit is in Mode 1 (Heating).
The acceptable temperature deviation from set point that is considered normal
2 (C)
HCV Error Threshold
74
The movement tolerance of the HCV. This is used to define when the valve is open -everything above the formula (100 – HCV Error Threshold) is considered saturated.
2 (%)
Acceptable Hours per Week
60
The amount of time that this error is allowable for the unit per week. Anything more than that time is considered a fault.