Rheem-Ruud 42-21786-81 Relay High Compatibility: Designed specifically for

High Compatibility: Designed specifically for Amana and Goodman residential heating and cooling units

Unlike older upshot designs

Generic filters often lack the rigid framing or exact dimensions of the Nordyne 669073R

Ensure the mounting bracket aligns perfectly so the element is properly immersed in the gas flow for a clean light-off

While primarily used for vertical-up applications to shed standing water

Rheem-Ruud 42-21786-81 Relay High Compatibility: Designed specifically forThe Rheem Ruud 42 21786 81 Relay is a specialized 24V component engineered for precise defrost cycle management in residential and commercial heat pump systems. This OEM Rheem defrost relay features a complex 2DPDT and 1SPST (Double Pole Double Throw and Single Pole Single Throw) contact configuration, allowing it to simultaneously control multiple high voltage and low voltage circuits. This is critical for synchronizing the reversing valve, auxiliary