Laars Heating Systems R10364300 Return Header 321042-401 verify the 24V coil resistance

verify the 24V coil resistance and check for continuity across the normally open contacts during a call for stage 1 cooling or heating to ensure the switching control relay is responding to the thermostat signal

providing the consistent torque required for heavy-duty airflow cycles

Designed with dual 1/4" barb connections

This external protector kit functions as a high-reliability overload switch

Laars Heating Systems R10364300 Return Header 321042-401 verify the 24V coil resistanceThe Laars R10364300 return header is a glass lined cast iron (C. I.) hydraulic component used in Laars heating systems to manage return water flow through the boiler or heater assembly. This Laars return header assembly is engineered with a glass lined internal surface to resist corrosion and scale buildup, making it suitable for long term service in hydronic heating applications. Designed as a cast iron return manifold, it ensures proper distribution