Phase B diagnostic tool

Airflow Diagnostic Helper

Technical Review RequiredAI-assisted content

Mandatory diagnostic disclaimer

This tool organizes observations into possible causes and confirmation tests. It does not provide a confirmed diagnosis, replace manufacturer information, or authorize unsafe operation, component replacement, or refrigerant adjustment.

Probe boundary

Pressure-probe placement must match the manufacturer-defined external equipment boundaries. TESP = absolute return static + absolute supply static.

Return static (in. w.c.)Supply static (in. w.c.)Equipment maximum static

Calculated TESP

|-0.30| + |0.25| = 0.55 in. w.c.

Interpretation

Compare with the equipment nameplate, installation instructions, blower-performance table, and filter/coil data. This helper does not assume 0.5 in. w.c. or any other value is a universal maximum.