Resideo by Honeywell R8845U1003 Universal Hydronic Switching Relay 24V

The Resideo by Honeywell R8845U1003 is a universal hydronic switching relay designed for HVAC and heating system applications. This AC-operated relay provides reliable switching control for hydronic heating systems, boilers, and zone control applications.

Key Specifications:

• SPST contact configuration with 120V AC voltage rating
• Contact current rating: 7/44.4 Amp at 120V AC (full load)
• 24V AC coil voltage at 60 Hz operation
• Integral transformer with 24V AC secondary voltage
• Operating temperature range: -20°F to 120°F
• Humidity tolerance: 0 to 90% RH
• Surface mount installation with #8 captivated screw terminals

Advanced Features:

• Replaceable socketed relays for easy maintenance and serviceability
• Two troubleshooting LED indicators for simplified diagnostics
• Push-to-test button for quick functionality verification
• Replaceable transformer fuse for circuit protection
• Long-life DC relay drive control technology for enhanced durability
• Includes protective enclosure housing

The R8845U1003 measures 4-7/16" W x 3-1/2" D x 6-1/4" H and comes complete with an integral transformer and enclosure. This universal relay is ideal for retrofit applications and new installations requiring dependable switching control in residential and light commercial hydronic heating systems.