The York 15SHX21, 309746, 6734 Relay (1 Unit) is a genuine OEM heat sequencer designed to control heating elements and blower operation in York electric furnaces and air handlers. This sequencer ensures that heating elements activate in proper sequence, preventing electrical overload and providing smooth, reliable heating performance. Built to York?s factory standards, it guarantees safe and efficient operation with 24 V control systems. Key Features Genuine York OEM heat sequencer relay Controls heating element activation and blower operation Prevents power surges and maintains safety during startup Compatible with 24 V control systems Durable and reliable design for long service life Specifications Part Numbers: 15SHX21, 309746, 6734 Type: Relay / Heat Sequencer Voltage: 24 V Application: Electric furnaces and air handlers Brand: York Compatible Models BQ036E15N2AAA1A BQ048E15P2AAA1A BQ060E15N2DBA1A BB05E20AFBAA1A D2HE060E01525MAA D4CE060E01525MA D2NZ036D07225 DF048E15Y2FAA1A HC60D2CH1 GY8S100B12DN11 and more Why Choose This Item Choose the York 15SHX21, 309746, 6734 Relay (1 Unit) to restore proper sequencing and safety in your York heating system. This OEM part ensures dependable heat control, longevity, and compatibility?the right replacement for maintaining reliable operation and system performance.