Modine 5H0750300003 Pressure Switch

The Modine 5H0750300003 Pressure Switch is a critical safety component factory-calibrated to 0.27"WC for precise vacuum monitoring in high-efficiency heating systems. As a genuine Modine OEM replacement for the 5H75030-3 and NS2-0325-00, this SPST pressure switch ensures the inducer fan is generating sufficient static pressure before allowing the ignition sequence to proceed. Engineered for durability, it features a robust silicone diaphragm and a flame-resistant ABS housing, making it ideal for the demanding environments of commercial unit heaters like the Modine HD60 and HD75 series. With its 24V AC electrical rating and 1/4" quick-connect terminals, this switch provides a reliable interface with the integrated furnace control. This part is essential for resolving pressure switch stuck open errors and ensuring long-term HVAC system performance and safety compliance.

• Precision Calibration: Factory-set at 0.27" water column to prevent nuisance shutdowns and ensure accurate air-flow sensing.
• Direct OEM Compatibility: Engineered specifically for Modine HD60, HD75, HDB75, and HD75AH01 models for seamless physical and electrical integration.
• Enhanced Safety: Features an automatic reset and a 100,000-cycle minimum rating for consistent monitoring of combustion air.
• High-Grade Construction: Built with a high-temperature silicone diaphragm to maintain accuracy across an operating range of -40°F to 190°F.

• Can the 5H0750300003 be adjusted in the field? No, this is a fixed-setpoint switch calibrated to 0.27"WC. Attempting to adjust the calibration screw can lead to unsafe burner operation or system failure.
• What causes a pressure switch error on my Modine heater? Common triggers include a restricted vent pipe, a failing inducer motor, cracked tubing, or a ruptured internal diaphragm within the switch itself.
• Does orientation matter when installing this part? While it functions in multiple positions, mounting it vertically with the ports facing down helps prevent moisture accumulation in the housing, which is a common cause of premature failure in cold climates.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.