Robust Construction: The aluminum body is designed to withstand ambient temperatures up to 150°F in demanding mechanical rooms

single-throw design for consistent electrical continuity and breaking

Broad Compatibility: Integrated system sensor for Lochinvar Knight and A

biodegradable oil for superior heat transfer and internal self-healing properties

Lennox 67K66 Heat Relay 30067439-890 Robust Construction: The aluminum bodyThe Lennox 67K66 Heat Relay is a heavy duty 24V 3PDT relay engineered for precise load management in Lennox residential and commercial heating equipment. Operating with a 24VAC control signal, this Triple Pole Double Throw (3PDT) component provides the necessary switching capacity to handle multiple high voltage circuits simultaneously, common in complex air handler and furnace configurations. As a direct replacement for Lennox 67K6601 and 58C9901, it