High DeltaT.

Trigger, action plan, and escalation criteria.

Related metric

cooling_delta_t

Trigger

(RAT − SAT) > threshold_max during cooling_mode (sustained)

Value drivers

Energy savings Customer experience

Preconditions

RAT and SAT sensors operational; cooling mode detectable.

Human role

Primary — dispatch decision.

Action plan

(1) Sensor sanity check. (2) If a filter ΔP sensor is present (Optimized add-on), confirm filter restriction. (3) Dispatch with airflow scope (filter → blower → dampers).

Escalation

(1) Filter ΔP sensor not present and recurrence > 1 event in 14 days → dispatch with airflow scope (filter, blower, dampers). (2) Blower fault confirmed remotely → dispatch within 48h; comfort risk grows as building load increases through the day. (3) Recurrent dampers / ducting issue → flag for capital review (not a maintenance issue). (4) High DeltaT co-occurs with a Temperature Compliance failure → out-of-cycle notification to client; comfort impact is in progress.

Prevention

(1) Filter-replacement cadence calibrated to site dust load — high-dust sites (urban, food-service kitchen exhaust) need shorter intervals than the manufacturer default. (2) Damper-position audit at install and at quarterly cadence — closed or stuck dampers are a recurring source of high ΔT that visual inspection catches early. (3) Blower performance baseline captured at install — gives the operator a reference to compare against when remote signals first deviate.