Modine 5H0735910005 Pressure Switch

The Modine 5H0735910005 Pressure Switch is a critical safety component engineered for precise airflow monitoring in high-efficiency heating systems. Designed as a 1.10" WC SPST pressure switch, this Modine OEM replacement part ensures the inducer motor establishes a proper vacuum before allowing the ignition sequence to proceed. It serves as the direct successor to the Modine 5H73591-5, maintaining identical trip points and electrical characteristics for a seamless drop-in fit. Built to withstand the high-cycle demands of industrial and commercial environments, this HVAC inducer limit switch protects the heat exchanger by preventing operation during vent blockages or motor failure.

For technicians performing a Modine unit heater repair, this switch is compatible with several large-format models, including the Modine PV300, PV350, and PV400, as well as the Modine BV300, BV350, and BV400 series. Its Single Pole Single Throw (SPST) configuration provides a reliable normally-open circuit that closes only when the specific 1.10" water column threshold is reached. Utilizing a genuine Modine 5H0735910005 ensures calibrated accuracy and long-term reliability in venting safety circuits.

• Exact Calibration: Factory-set at 1.10" WC to match the specific static pressure requirements of Modine Power Vented and Building Vented units.
• Verified Compatibility: Direct replacement for 5H73591-5, ensuring no modifications are needed for mounting or wiring in supported PV and BV models.
• Durable Construction: Engineered to hold tight tolerances across thousands of ignition cycles in harsh mechanical room conditions.
• Safety Compliance: Acts as a primary safety interlock, preventing gas valve energization if the exhaust flue is obstructed.

What are the symptoms of a failing pressure switch?
Usually, the unit will display a diagnostic flash code (often two flashes on Modine boards) indicating the switch failed to close or stayed closed. You may hear the inducer motor run, but the hot surface ignitor will not glow.

Can I use a switch with a different water column (WC) rating?
No. Pressure switches are safety-rated for specific blower and venting configurations. Installing a switch with an incorrect rating can lead to dangerous soot buildup or delayed ignition.

How do I test the Modine 5H0735910005?
With the heater calling for heat and the inducer running, use a manometer to verify the vacuum pressure meets the 1.10" WC requirement, then check for continuity across the SPST terminals.

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.