Determine if AHU MAT is not following RAT when drawing no outside air (Air Damper Leakage)
Applicable Systems
Primary: AHU, RTU, MUA, ERV
Objective/Method/Outcome
Objective: Determines whether the mixed air damper (MAD) is leaking. Mixed air temperature (MAT) should have a similar value to return air temperature (RAT) while drawing no outdoor air.
Method: Sums the total number of times the difference between the RAT and MAT is greater than a threshold, while the unit is on and the MAD is closed.
Outcome: An insight is generated if this duration is greater than a weekly threshold of 6 hours.
Logic
Inputs
Mixed Air Damper [%] {cmd, mixed, air, damper}
Mixed Air Temperature [°C] {sensor, mixed, air, temp}
Status {status|feedback|cmd}
Return Air Temperature [°C] {sensor, return, air, temp}
