Provide conventional on-off control of heating elements and fan in an electric furnace. Features Designed for quiet operation. R8246A and R8229A replace over 50 Honeywell and competitive electric heat primaries, including the Honeywell R8330 Electric Furnace Sequencer. Use on furnaces with a line voltage or pilot duty limit. Simple ON-OFF switching - readily understood and easily serviced- Eliminates cold drafts on system startup.