Source1 2435978000 Air Pressure Switch 0.67 Iwc on Fall Spno

Product Description

The Source1 2435978000 is an air pressure switch designed for use in HVAC systems where reliable pressure sensing and circuit control are required. This switch operates on a single-pole normally open (SPNO) configuration and is set to activate on a pressure fall at 0.67 inches water column (IWC). When the measured air pressure drops to the set point, the switch closes the circuit, triggering the appropriate system response. This behavior is critical in furnaces, air handlers, and ventilation systems where pressure monitoring ensures safe and efficient operation.

Air pressure switches like the Source1 2435978000 are commonly used to monitor the negative pressure created by inducer motors in gas furnaces. If the inducer fails to produce adequate draft, the pressure switch prevents the ignition sequence from continuing, protecting the equipment and the occupants of the building. HVAC technicians rely on these switches as a first line of defense in combustion safety systems.

The SPNO design means the switch contacts remain open under normal conditions and close only when the pressure falls to or below the 0.67 IWC threshold. This makes it suitable for draft proving, blocked flue detection, and blower verification applications. The 0.67 IWC set point is a common specification found in residential and light commercial heating equipment, making this switch a practical replacement or service part for a wide range of systems.

HVAC service professionals will find this part useful for routine maintenance, warranty repairs, and system troubleshooting. The Source1 brand supplies quality OEM-grade components trusted by technicians in the field.

• Single-pole normally open (SPNO) configuration closes on pressure fall
• Set point of 0.67 inches water column for precise pressure activation
• Designed for draft proving and combustion safety applications in HVAC systems

Product Highlights

The Source1 2435978000 air pressure switch delivers dependable pressure sensing at a 0.67 IWC set point with an SPNO design, making it a reliable service replacement for furnaces and air handlers requiring combustion safety controls.

Product Information

Standard Information

• Brand: SOURCE1
• Manufacturer Part Number: 2435978000

Technical Specifications

• Switch Type: Air Pressure Switch
• Configuration: Single-Pole Normally Open (SPNO)
• Activation: Closes on pressure fall
• Set Point: 0.67 inches water column (IWC)