Upstairs heat gain was rectified by rebalancing manual supply trunk dampers, adjusting blower ECM static tap speed, and expanding the restricted upstairs return air grille.
Diagnostic Procedure & Field Restoration:
- Thermal stack effect and undersized 12-inch upstairs return duct starved the attic air handler of second-floor warm air removal.
- Total external static pressure (TESP) measured 0.88 inches water column (in. w.c.), indicating excessive duct resistance.
- Adjusted manual supply plenum balancing dampers to route 65% of conditioned airflow to second-story bedroom trunks during summer mode.
- Upgraded return duct capacity and dialed ECM blower motor static CFM tap, reducing the upstairs-downstairs temperature differential from 8 degrees down to 1.5 degrees.
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