York S1-024-21678-700 Relay

The York S1-024-21678-700 is an OEM 24V SPDT Relay designed for heavy-duty switching in residential and commercial HVAC control systems. This component serves as the direct 024-21678-000 replacement, ensuring seamless integration into existing control boards without requiring circuit modifications. Engineered with a 24VAC 50/60Hz coil, this Single Pole Double Throw relay provides the necessary electrical isolation between low-voltage thermostat signals and high-current mechanical loads like blower motors and fans.

For service technicians troubleshooting intermittent connectivity or contact welding, this switching relay offers a reliable fix for HVAC system short-cycling and non-responsive components. Its compact cube-style form factor allows for efficient mounting in tight control cabinets, maintaining OEM specifications for timing and load handling. When precision switching is required to bridge the gap between control logic and power execution, this York genuine part delivers consistent performance across varying duty cycles.

• Direct OEM Replacement: Replaces deprecated part number 024-21678-000 for rapid field repairs.
• High Cycling Durability: Engineered to withstand repeated switching relay operations in high-demand environments.
• Versatile SPDT Logic: Enables control of multiple system components through a single 24V trigger.
• Electrical Isolation: Protects the integrated HVAC control board by separating sensitive signals from line voltage loads.

Common Questions

Can I use this relay to replace an SPST configuration?
Yes, because this is an SPDT relay, it can cover SPST (Single Pole Single Throw) functions by utilizing the common and the normally open (NO) terminals while leaving the normally closed (NC) terminal unused. Always verify your wiring diagram before energizing.

What are the signs that my York control relay has failed?
Common indicators include an audible buzzing or rapid clicking noise, a blower motor that fails to engage despite a call for cooling, or the external condenser not receiving the 24V signal to start the compressor contactor.

Is this compatible with 50Hz and 60Hz systems?
The coil is rated for 24VAC 50/60Hz, making it suitable for standard domestic applications as well as international power frequencies used in light commercial York units.

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.