the 998-0520-00 is an INT69 SC2 Diagnose module

The unit resolves an increase or decrease signal into multiple steps

and Janitrol

Designed with 5/8-inch inlet and outlet connections

Operating at 1100 RPM on 208-230V single-phase power

Danfoss 193B-1536 4 Way Valve 30067439-890 the 998-0520-00 is an INT69The Danfoss 193B 1536 4 Way Valve is a high performance rotary mixing valve engineered for precision temperature control in hydronic heating and cooling systems. Built with a DZR brass valve body (Dezincification Resistant), this 2 inch valve provides exceptional durability in closed loop applications using water or up to 50% glycol concentrations. With a significant flow capacity of 46. 8 Cv and 2" FNPT threaded connections, it is designed for high