Modine 5H0730350000 Fan Relay

The Modine 5H0730350000 Fan Relay is a specialized 24V fan delay timer engineered for high-performance unit heaters and industrial air movers. As a direct OEM replacement for the Modine 5H73035 and 4034110, this component is critical for managing the operational sequence of the blower motor. It functions by delaying fan activation at startup to allow the heat exchanger to reach optimal temperature, while also providing a 30 to 90-second post-purge cycle to safely dissipate residual heat after the burner shuts down. This precise timing prevents thermal stress on the heat exchanger and minimizes motor wear from unnecessary cycling. Compatible with a broad range of Modine series, including PA, PV, and BAE units, this low voltage relay ensures the control circuit maintains stable communication between the thermostat and the high-voltage blower motor. For contractors, utilizing this genuine HVAC switching relay is essential for restoring factory-standard efficiency and ensuring long-term system reliability in commercial gas-fired and electric heating applications.

• Direct OEM Compatibility: Seamlessly replaces Modine 5H73035, 5H71627, and 5H602054 models to maintain equipment certification.
• Optimized Heat Exchange: Integrated time delay relay logic manages the fan-on and fan-off sequences to protect the heat exchanger from rapid temperature shifts.
• Electrical Isolation: Efficiently switches high-current fan loads using a low-voltage 24V control signal, reducing stress on the main ignition control board.
• Reduced Maintenance: Minimizes motor contactor wear and bearing fatigue by eliminating short-cycling during fluctuating thermostat demands.

• What does this relay do if the heater ignites but the fan fails to start? If your burner fires but the fan remains stagnant, causing the high-limit switch to trip, the 5H0730350000 fan timer is frequently the point of failure in the control sequence.
• Is this relay compatible with 120V or 240V fan motors? Yes, while the coil operates on 24V, the internal contacts are rated to switch the line voltage required by standard Modine blower motors.
• Can I use this for a summer fan switch application? Absolutely. This relay is standard in configurations requiring independent fan control for summer ventilation without activating the gas valve.

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.