Weil McLain 510-312-167 Transformer

The Weil McLain 510-312-167 is a mission-critical combination transformer and DPST relay assembly designed for seamless integration into Weil-McLain boiler control circuits. This factory-spec component serves as a robust 120/24 volt step-down transformer, providing a consistent 40 VA power rating to drive low-voltage ignition systems, zone valves, and auxiliary controls. Engineered for high-demand hydronic environments, the 510-312-167 relay assembly features a dual-pole, single-throw configuration that ensures reliable switching for burner and circulator cycles.

This OEM HVAC replacement part is the standard for service technicians working on CGx, CGA, VHE, CG, and HE series boilers, including the CGM-25 standing pilot models. Replacing a legacy boiler transformer-relay with this Weil McLain 510-312-167 maintains the precise secondary voltage output required for modern electronic thermostats and smart control modules. Its compact, field-replaceable design minimizes downtime during emergency repairs, ensuring the control board receives stable 24V power without voltage drop under load.

• Optimized Compatibility: Verified fit for Weil-McLain CG, CGA, CGx, HE, and VHE boiler series.
• High Output Capacity: 40 VA rating supports multiple low-voltage loads and smart thermostat power requirements.
• DPST Reliability: Heavy-duty dual-pole switching handles critical burner and pilot signals simultaneously.
• Direct Replacement: Factory-standard terminal markings simplify field wiring for faster service calls.
• Industrial Build: Designed to withstand the thermal stress of high-temperature mechanical rooms.

• Will this transformer support a WiFi thermostat? Yes, the 40 VA rating provides ample headroom for the "C" wire power draw required by modern smart thermostats.
• Can I use this for the CGM-25 standing pilot? Absolutely, this assembly is specifically listed as the compatible replacement for that series.
• What is the primary voltage input? This unit is built for a standard 120V primary input with a transformed 24V secondary output.

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.