Modine 5H0749330003 Relay

The Modine 5H0749330003 Relay is a heavy-duty, OEM-spec electromagnetic switch engineered for 120V heating systems. This industrial unit heater relay serves as the primary interface between low-power control signals and high-power blower or burner circuits, ensuring seamless ignition and fan sequencing. As a genuine Modine replacement part, it is listed under cross-reference R4222D1039, maintaining the precise electrical tolerances required for Modine HVAC maintenance and commercial-grade reliability. This 120-volt electromechanical relay is built with a rugged contact configuration to handle the inductive loads typical of high-performance heaters in warehouses and workshops. For any tech in the field, this is the standard HVAC control relay used to restore factory-level performance and prevent electrical overloads in critical heating infrastructure. Its 0.74 lbs build and standard footprint allow for rapid field integration without modification.

• OEM Precision: Direct replacement for R4222D1039, ensuring exact electrical compatibility with Modine unit heaters.
• Enhanced Durability: Constructed for industrial environments to resist contact pitting and premature failure under heavy duty cycles.
• Simplified Integration: Standard terminal layout for fast installation, reducing downtime during emergency service calls.
• Safety-First Design: Built to prevent electrical overloads and optimize precise temperature and airflow control sequences.

Is the Modine 5H0749330003 Relay compatible with 24V control circuits?
Yes, while this is a 120V relay for the load side, it is designed to interface with standard low-voltage control signals common in Modine HVAC systems.

How do I verify if this relay is failing in my heater?
Technicians should check for continuity across the coil and inspect contacts for signs of carbon buildup or sticking, which often causes blower motor or burner failure.

Where can I find the wiring diagram for this Modine relay?
Wiring schematics are typically located on the interior panel of the Modine unit heater; the 5H0749330003 follows the standard R4222D1039 terminal numbering for straightforward 1-to-1 replacement.

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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.