This 4-switch electric heat sequencer features a solid-state 24V heater that provides precise timing for auxiliary contacts

Using a genuine Rheem-Ruud 42-21571-08 ensures the coil resistance is matched perfectly to the transformer output

allowing for flexible installation in either vertical or horizontal orientations

it should read as a closed circuit (zero or near-zero resistance)

For technicians performing furnace limit switch troubleshooting

Watts 0556002 Valve This 4-switch electric heat sequencerThe Watts 0556002 (Model LFLL100XL 150 3 4) is a lead free transition for the legacy 0066132, engineered specifically for high efficiency water heaters and storage tanks. Designed as a dual function T&P relief valve, it provides autonomous protection against excessive thermal expansion and over pressurization. This model features an extended shank capable of penetrating up to 2 1 2 inches of tank insulation, eliminating the need for additional