The Lennox 51A99 Relay-TD is a factory-authorized time delay relay module designed for use in HVAC systems where timed sequencing is critical. This component ensures a controlled delay in electrical circuit operation, often used to prevent compressor short cycling or stagger component start-ups for better system reliability and efficiency.Key Specifications:

• Part Number: 51A99 / 51A9901
• Type: Time Delay Relay (TD)
• Delay Function: Typically delays fan or compressor start or shutdown
• Voltage Rating: 24 VAC control voltage (verify compatibility with system specs)
• Timing Range: Fixed or factory-set delay (commonly 90–180 seconds, model dependent)
• Mounting Style: Plug-in or panel-mounted design for easy installation
• Application: Designed for use in air handlers, furnaces, compressors, and other HVAC components
• Compatibility: Fits select Lennox systems requiring a TD relay module
• Construction: Heavy-duty, OEM-grade components for long service life
• Certifications: Meets Lennox OEM specifications for system integration and safety

This component is critical for maintaining smooth system operation, protecting compressors from premature cycling, and ensuring optimal start-up sequencing.Buy with confidence at Beenimax.com — where HVAC professionals and contractors find genuine Lennox parts at competitive prices.