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

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

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

For technicians performing furnace limit switch troubleshooting

while the integrated shunt allows the other side of the line to remain connected

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