By upgrading to this modern York spark ignition kit

audible air leaks near the blower assembly

External Equalization: Provides more accurate pressure sensing compared to internal equalizer valves in systems with high pressure drops across the distributor

5 Cv capacity

Aaon V71561 Pressure Switch 321894-709 By upgrading to this modernThe Aaon V71561 Pressure Switch is a critical safety and monitoring component engineered for high performance HVAC systems. This differential air pressure switch is designed to detect precise changes in airflow, operating within a calibrated range of . 08" WC minimum to . 18" WC maximum. By monitoring the pressure drop across filters, coils, or fans, the V71561 ensures that your Aaon equipment operates within safe mechanical limits. Built for