Lennox 18Y93 Relay Kit

The Lennox 18Y93 Delay Relay Kit is a critical OEM component designed to regulate blower motor timing and facilitate efficient sequence operations in commercial HVAC equipment. As a primary delay relay kit, the 18Y93 provides a fixed 45-second blower-on delay and a 150-second blower-off delay, ensuring the heat exchanger is adequately warmed before airflow begins and residual heat is fully utilized post-cycle. This HVAC time delay relay is the factory-authorized replacement for legacy part numbers 78K59, 27L43, and LB-91256A. Built for high-demand applications, it is rated for 460V 3-phase operation and is frequently found in 10-ton cooling systems and GCS16/24 series units. Field technicians should note that while this kit serves as a direct functional 106397-01 upgrade, it does not include auxiliary wiring; existing conductors must be mapped carefully to the new terminal configuration to maintain proper HVAC compressor protection and control logic.

• Direct OEM Replacement: Seamlessly replaces Lennox 78K59 and 27L43 models to restore factory-spec timing.
• Optimized Cycle Performance: Precisely manages the fan delay to prevent cold air discharge during initial heating stages.
• High-Voltage Compatibility: Engineered for 460V industrial and commercial power configurations.
• System Protection: Reduces stress on the blower motor and compressor by preventing rapid cycling and ensuring thermal equilibrium.

Is the wiring harness included with the 18Y93?
No, this specific kit is the relay component and does not include 18Y93 wiring. Technicians must utilize existing terminal leads or source compatible high-temperature conductors for installation.

What units are compatible with this time delay relay?
This kit is commonly utilized in Lennox GCS16, GCS24, and larger 10-ton commercial rooftop units. Always verify your specific model number against the factory parts manual.

Can I use this to replace a 24V relay?
This unit is designed for 460V applications. Replacing a lower-voltage control component with this high-voltage relay will cause system failure; always confirm your control circuit voltage before installation.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.