Source1 2435977000 Air Pressure Switch 0.40 Inch Wc on Fall Spno

Product Description

The Source1 2435977000 is an air pressure switch designed for use in HVAC systems where reliable pressure sensing and circuit control are essential. This switch operates on a falling pressure signal, meaning it activates when system pressure drops to or below 0.40 inches of water column (IWC). It features a Single Pole Normally Open (SPNO) configuration, which means the electrical circuit remains open under normal conditions and closes when the set pressure threshold is reached on the fall. This type of pressure switch is widely used in furnaces, air handlers, draft inducer systems, and ventilation equipment to monitor airflow and protect system components from operating under unsafe or inefficient pressure conditions. HVAC technicians rely on air pressure switches to verify that the inducer motor is moving air correctly before allowing the system to proceed through its ignition sequence. Without a properly functioning pressure switch, a furnace or air handler may fail to light or may shut down mid-cycle as a safety measure. The Source1 2435977000 provides that critical safety interlock. It is built to work within standard residential and light commercial HVAC applications. Installation is straightforward for qualified technicians familiar with pressure switch replacement and system commissioning. The switch connects inline with the control board circuit, and the pressure port attaches to a hose from the inducer or flue system. Replacing a faulty pressure switch with the correct rated unit, such as this 0.40 IWC model, restores proper system operation and prevents nuisance lockouts. Source1 is a trusted brand in the HVAC supply industry, known for producing reliable replacement components that meet OEM-equivalent standards.

• Activates on falling pressure at 0.40 inches of water column for precise system control
• Single Pole Normally Open (SPNO) configuration provides a safe default open-circuit state
• Designed for furnace, air handler, and draft inducer pressure monitoring applications

Product Highlights

The Source1 2435977000 air pressure switch delivers dependable 0.40 IWC on-fall sensing in an SPNO design, making it a direct replacement choice for HVAC technicians servicing furnaces and air handling equipment.

Product Information

Standard Information

• Brand: SOURCE1
• Manufacturer Part Number: 2435977000

Technical Specifications

• Switch Type: Air Pressure Switch
• Set Point: 0.40 inches water column
• Activation Mode: On Fall
• Configuration: Single Pole Normally Open (SPNO)
• Application: HVAC furnaces, air handlers, draft inducer systems