Modine 5H0730340000 Relay

The Modine 5H0730340000 Relay is a specialized vent motor time delay relay engineered for precise control within Modine gas-fired unit heaters. As a direct replacement for 5H73034, this OEM component maintains the critical post-purge cycle, allowing the power exhauster to continue operation for 30 to 90 seconds after the thermostat is satisfied. This ensures all residual combustion gases are cleared from the heat exchanger, preventing condensation and enhancing the longevity of the draft inducer assembly. Designed for high-duty cycles, this replacement 24V HVAC relay features a normally open (NO) contact set capable of switching line voltage loads, typically rated for 1/2 HP up to 2 HP depending on the specific voltage application (125V/250V). Contractors will find the 1/2" conduit connector and compact 3" x 2-5/2" footprint ideal for field mounting within the standard unit junction box. This OEM Modine heater part is essential for restoring the safety-interlock sequence between the power exhauster motor and the main gas valve circuit.

• Direct OEM Compatibility: Engineered specifically to replace legacy 5H73034 relays without requiring bracket modifications.
• Reliable Post-Purge Cycle: Integrated time delay for power venter ensures thorough venting of flue gases.
• Heavy-Duty Contacts: Rated for up to 2 HP at 250V, providing robust switching for venter motor assemblies.
• Simplified Field Wiring: Standardized terminal markings and a built-in 1/2" conduit connector facilitate rapid installation.
• System Protection: Prevents heat exchanger stress by managing the thermal cooling interval via forced draft control.

Is this relay compatible with older PD and BD series Modine heaters?
Yes, this vent motor relay is the primary replacement for the 5H73034 found in many PD, BD, and PSH series units. Always verify your unit's control code against the factory wiring diagram before installation.

Does this part handle the low voltage signal from the thermostat?
The coil is designed for 24V 50/60 Hz control circuits, while the internal electromagnetic switch isolates and controls the higher voltage power exhauster motor.

What happens if the time delay relay fails?
If the venter relay fails to close, the power exhauster will not start, preventing the pressure switch from closing and the burner from igniting. If it fails to open, the fan may run continuously, leading to premature motor wear.

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.