Lennox 13H78 Relay 320074-702 Complete HSI Integration: Replaces outdated

Complete HSI Integration: Replaces outdated pilot assemblies with a modern hot surface ignition system for improved reliability

The HTP-B drain pan is specifically reinforced to handle the higher temperatures generated by furnaces in upflow configurations

Common Questions: What compressors are compatible with the 06DA660060

The York S1-331-09150-000 Control Board Kit is a critical OEM replacement part designed for Simplicity 1A 2/4 stage HVAC systems

Built with a sealed housing for industrial HVAC system components

Lennox 13H78 Relay 320074-702 Complete HSI Integration: Replaces outdatedThe Lennox 13H78 Relay is a heavy duty 24V DPDT relay engineered for precise switching control within Lennox heating and cooling systems. Built to handle dual circuit switching, this double pole double throw relay manages various voltage pathways simultaneously, ensuring consistent communication between the thermostat and high voltage components like blower motors or compressors. Operating at a standard 50 60 Hz frequency, the 13H78 is a critical HVAC