such as the 5009621 and 5009622 models

Operating on a 24VAC 50/60Hz power supply with a 150mA current draw

Utilizing an OEM part for your evaporator coil drainage ensures that the pitch and drainage ports align perfectly with the unit's internal chassis

As an essential passive component

Resideo AT150B1252 Transformer 318973-401 such as the 5009621 andThe Resideo AT150B1252 Transformer is a compact, foot mounted power solution engineered for rigorous light commercial and residential HVACR control systems. This heavy duty unit efficiently steps down 277V primary voltage to a stable 24VAC secondary (27. 5 V. O. C.), delivering a reliable 50VA rating for driving hydronic controls, magnetic switches, and Building Automation Systems (BAS). Designed with a focus on field durability, it features plastic