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This is an SPST (Single Pole Single Throw) switch with a Normally Open (NO) contact function that closes on rising pressure
This HVAC safety switch utilizes a SPST (Single Pole Single Throw) configuration to interrupt the 120V circuit
Common failure points include low voltage from a failing transformer (chatter)
including units from York
designed for immediate installation using the existing mounting points in the burner vestibule
Slant Fin 440-856-000 Pressure Switch This is an SPST (SingleThe Slant Fin 440 856 000 Pressure Switch is a critical safety component engineered specifically for high efficiency draft inducer monitoring. This OEM Slant Fin replacement part is calibrated to a fixed . 90" WC pressure setting, providing precise differential air pressure detection to ensure the combustion blower is moving sufficient air for safe burner operation. Designed for compatibility with the Slant Fin Victory II series, including models VHS
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