Lennox 40L87 Relay
The Lennox 40L87 Relay is a specialized 24V SPDT switching relay engineered for heavy-duty HVAC sequencing and control applications. Designed to handle the rigorous switching demands of Lennox residential and light commercial units, this electrical component facilitates seamless signal routing between thermostats and air handlers or heat pumps. This replacement HVAC relay serves as a direct substitute for numerous legacy control components, ensuring that voltage transitions remain crisp and load distribution stays within specified tolerances. By utilizing high-conductivity contact materials, the 40L87 minimizes voltage drop and heat generation at the terminal points, protecting downstream sensitive controller boards from arcing-induced interference.
- Universal 24V Control Power: Optimized for standard low-voltage control circuits, ensuring compatibility with Lennox OEM parts and third-party systems.
- Snap-Action Switching: Precision-wound coil provides immediate contact closure, reducing the risk of motor chatter or erratic sequencing.
- Enhanced Durability: Housed in a dust-resistant casing to maintain HVAC system reliability in demanding mechanical room environments.
- Simplified Wiring: Features standard spade terminals for quick-connect installation, reducing labor time during field service calls.
- Reliable Load Management: Rated for high-cycle switching, making it an ideal choice for HVAC relay replacement in high-demand furnace or air conditioning setups.
Technical FAQ
What are the common symptoms of a failing Lennox 40L87 relay?
Technicians often encounter humming from the control box, intermittent fan operation, or a total loss of the 24V signal to the inducer motor or compressor contactor when this relay fails.
Can I use this relay to replace a SPST configuration?
Yes, while this is an SPDT relay, it can be wired for SPST applications by utilizing only the Normally Open (NO) or Normally Closed (NC) terminals as required by the wiring diagram.
Will this relay solve a 'no heat' call on my Lennox unit?
If the control board is outputting 24V but the component is not receiving power, the 40L87 is a likely culprit. Check for continuity across the coil before finalizing the replacement.
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.
Original: $37.28
-65%$37.28
$13.05Lennox 40L87 Relay
The Lennox 40L87 Relay is a specialized 24V SPDT switching relay engineered for heavy-duty HVAC sequencing and control applications. Designed to handle the rigorous switching demands of Lennox residential and light commercial units, this electrical component facilitates seamless signal routing between thermostats and air handlers or heat pumps. This replacement HVAC relay serves as a direct substitute for numerous legacy control components, ensuring that voltage transitions remain crisp and load distribution stays within specified tolerances. By utilizing high-conductivity contact materials, the 40L87 minimizes voltage drop and heat generation at the terminal points, protecting downstream sensitive controller boards from arcing-induced interference.
- Universal 24V Control Power: Optimized for standard low-voltage control circuits, ensuring compatibility with Lennox OEM parts and third-party systems.
- Snap-Action Switching: Precision-wound coil provides immediate contact closure, reducing the risk of motor chatter or erratic sequencing.
- Enhanced Durability: Housed in a dust-resistant casing to maintain HVAC system reliability in demanding mechanical room environments.
- Simplified Wiring: Features standard spade terminals for quick-connect installation, reducing labor time during field service calls.
- Reliable Load Management: Rated for high-cycle switching, making it an ideal choice for HVAC relay replacement in high-demand furnace or air conditioning setups.
Technical FAQ
What are the common symptoms of a failing Lennox 40L87 relay?
Technicians often encounter humming from the control box, intermittent fan operation, or a total loss of the 24V signal to the inducer motor or compressor contactor when this relay fails.
Can I use this relay to replace a SPST configuration?
Yes, while this is an SPDT relay, it can be wired for SPST applications by utilizing only the Normally Open (NO) or Normally Closed (NC) terminals as required by the wiring diagram.
Will this relay solve a 'no heat' call on my Lennox unit?
If the control board is outputting 24V but the component is not receiving power, the 40L87 is a likely culprit. Check for continuity across the coil before finalizing the replacement.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Lennox 40L87 Relay is a specialized 24V SPDT switching relay engineered for heavy-duty HVAC sequencing and control applications. Designed to handle the rigorous switching demands of Lennox residential and light commercial units, this electrical component facilitates seamless signal routing between thermostats and air handlers or heat pumps. This replacement HVAC relay serves as a direct substitute for numerous legacy control components, ensuring that voltage transitions remain crisp and load distribution stays within specified tolerances. By utilizing high-conductivity contact materials, the 40L87 minimizes voltage drop and heat generation at the terminal points, protecting downstream sensitive controller boards from arcing-induced interference.
- Universal 24V Control Power: Optimized for standard low-voltage control circuits, ensuring compatibility with Lennox OEM parts and third-party systems.
- Snap-Action Switching: Precision-wound coil provides immediate contact closure, reducing the risk of motor chatter or erratic sequencing.
- Enhanced Durability: Housed in a dust-resistant casing to maintain HVAC system reliability in demanding mechanical room environments.
- Simplified Wiring: Features standard spade terminals for quick-connect installation, reducing labor time during field service calls.
- Reliable Load Management: Rated for high-cycle switching, making it an ideal choice for HVAC relay replacement in high-demand furnace or air conditioning setups.
Technical FAQ
What are the common symptoms of a failing Lennox 40L87 relay?
Technicians often encounter humming from the control box, intermittent fan operation, or a total loss of the 24V signal to the inducer motor or compressor contactor when this relay fails.
Can I use this relay to replace a SPST configuration?
Yes, while this is an SPDT relay, it can be wired for SPST applications by utilizing only the Normally Open (NO) or Normally Closed (NC) terminals as required by the wiring diagram.
Will this relay solve a 'no heat' call on my Lennox unit?
If the control board is outputting 24V but the component is not receiving power, the 40L87 is a likely culprit. Check for continuity across the coil before finalizing the replacement.
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.
