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this SPST (Single Pole Single Throw) switch ensures that the combustion inducer motor is generating sufficient static pressure before allowing the ignition sequence to proceed
including system evacuation
though the system limit is often determined by the tubing or valve cores used (typically 800 psi for valve cores)
20" WC setpoint
on the ZDS-30X10
Reznor 147571 Motor 30067439-890 this SPST (Single Pole SingleThe Reznor 147571 Motor is a precision engineered 115v 1 20hp 1050rpm HVAC motor designed specifically for secondary heat exchanger applications in high efficiency unit heaters. As a direct Reznor 95547 replacement motor, this permanent split capacitor (PSC) unit ensures seamless installation without requiring mounting modifications. Operating at 1050 RPM, it maintains the precise static pressure and airflow velocity required for optimal heat transfer