Source1 2550869000 Air Pressure Switch 0.35 to 0.85 Inches Wc Spno on Fall

Product Description

The Source1 2550869000 is an air pressure switch designed for use in HVAC systems where reliable pressure sensing and safety control are essential. This single-pole normally open switch activates on a fall in pressure, closing the circuit when system air pressure drops to the set point range of 0.35 to 0.85 inches water column. HVAC technicians and service professionals rely on this type of pressure switch to monitor inducer motor draft, combustion air proving, and system airflow in gas furnaces and air handlers.

Air pressure switches serve a critical safety role in forced-air heating equipment. When the inducer or draft blower fails to create the required negative pressure, the switch prevents the gas valve from opening, protecting the system and building occupants from combustion hazards. The SPNO configuration means the switch contacts are open at rest and close only when the sensed pressure meets the activation threshold. The on-fall designation confirms the switch closes as pressure falls through the set point, which is the standard mode used in most residential and light commercial furnace draft proving circuits.

This switch is a direct-fit replacement for systems originally using the York S1-02550869000 part number. It is built to withstand the temperature variations, vibration, and continuous cycling demands found inside heating equipment. HVAC technicians can install this switch confidently as a like-for-like replacement when diagnosing pressure switch faults, nuisance lockouts, or failed draft proving circuits.

• Pressure range of 0.35 to 0.85 inches water column, activates on pressure fall
• Single-pole normally open configuration for standard furnace draft proving applications
• Direct replacement for York S1-02550869000 air pressure switches

Product Highlights

The Source1 2550869000 air pressure switch provides dependable draft proving control in residential and commercial gas furnaces, making it a reliable replacement part for HVAC service professionals handling York and compatible equipment.

Product Information

Standard Information

• Brand: SOURCE1
• Manufacturer Part Number: 2550869000

Technical Specifications

• Switch Type: Air Pressure Switch
• Contact Configuration: Single-Pole Normally Open (SPNO)
• Activation Mode: On Fall
• Pressure Set Point Range: 0.35 to 0.85 inches water column
• Compatible OEM Part: York S1-02550869000