White-Rodgers 21V51U-843White Rodgers 21V51U 843 is a universal two stage hot surface ignition (H. S. I.) ECM circulator furnace control replacement kit. It combines two stage ignition with variable speed ECM control to support modern furnace performance. This kit replaces all WR 50V51 XXX'S and 50V61 XXX'S two stage H. S. I. systems with 80v Or 120v Ignitors, offering broad compatibility for legacy equipment. Designed as a single replacement solution, it covers multiple

while operating temperatures range from -30 to 40°C (storage from -40 to 80°C) and up to 90% relative humidity

Order today to ensure prompt service and continued reliability of your Grundfos pumping equipment

The included quick connect fitting simplifies installation

Crafted by Allanson

Microprocessor-based design for precise furnace control and enhanced reliability

easy-to-install safety control that fits standard control panels and wiring configurations

Rheem Furnace Parts 42-100491-09 is a reliable start relay engineered for dependable furnace startup in homes and small businesses

and straightforward wiring

Lead wire length: 4-1/2 inch

Built with a red brass body

normally open operation with 30s power-open / 10s spring-return

6" backlit display for easy viewing