Rheem-Ruud PD425117 Relay While the 3155 series typically

While the 3155 series typically requires a single gasket

it is professional best practice to inspect all limit switches in the circuit simultaneously to ensure consistent thermal response across the heating cycle

this coil provides the reliable magnetic pull needed to prevent valve sticking and ensure stable refrigerant flow control under high ambient heat conditions

This HVAC safety switch opens the circuit to prevent the furnace from operating in an unsafe thermal state

Common symptoms include a "bulged" or swollen top

Rheem-Ruud PD425117 Relay While the 3155 series typicallyThe Rheem Ruud PD425117 Relay is a heavy duty, field proven DPST (Double Pole Single Throw) switching solution engineered for precise motor and sequence control. Operating on a 24VAC coil, this relay is the industry standard direct replacement for 42 19423 02, ensuring seamless mechanical and electrical fitment in compatible Rheem, Ruud, and WeatherKing air handlers and furnaces. Featuring 1 4 inch quick connect terminals, it is rated for up to 12 FLA