This harness is designed for specific Carrier and RCD-branded furnace models

The Nor East Controls 30041038-001 Packing Nut is a critical replacement component engineered for high-pressure 4-inch to 6-inch reverse acting (R/A) control valves

providing seamless mechanical and electrical compatibility with legacy unit heaters

and mounting hardware to streamline field installations

Increasing the VA rating provides more overhead and reduces the risk of overheating when driving heavy control loads

Lochinvar & A.O. Smith 100277781 Control 321894-706 This harness is designed forThe Lochinvar 100277781 Control (Model FB751 1251) is an integrated control board engineered specifically for Crest Heating Boilers. As a critical OEM replacement part, this module manages the firing sequence, ignition control, and safety parameters for high efficiency hydronic systems. This model is a direct boiler part replacement for units with serial numbers beginning with 4015, ensuring seamless integration with existing HVAC wiring harnesses and