Resideo R8845U1003 Relay
The Resideo R8845U1003 Universal Switching Relay is a versatile solution designed for professional contractors managing hydronic heating systems or line voltage equipment control. This unit provides reliable 2 or 3-wire thermostat control for high-voltage devices, featuring a 120Vac primary voltage transformer and two SPST switches. It also includes an integrated powerpile-rated low-voltage SPST relay, making it a critical component for multizone relay installations. Built to withstand demanding mechanical rooms, it operates efficiently within an ambient temperature range of -20°F to 120°F. The R8845U1003 relay is rated for 7.4 Amps full load and 44.4 Amps locked rotor at 120Vac. If your application specifically requires normally closed contacts, use the RA889A series instead. This Honeywell switching relay is optimized for HVAC control wiring, ensuring circulator pump control and fan logic are handled with industrial-grade durability and thermostat-to-line-voltage compatibility.
Key Benefits
- Universal Application: Replaces a wide range of standard switching relays for residential and light commercial hydronic systems.
- High Amperage Rating: Robust 7.4 Amp full load capacity allows for direct control of heavy-duty circulators and motors.
- PowerPile Compatibility: Includes specialized low voltage relays suitable for millivolt or standard 24V thermostat applications.
- Flexible Wiring: Supports both 2-wire and 3-wire thermostat configurations for streamlined field installations.
- Durable Construction: Engineered to function in high-humidity environments (up to 90% RH) without condensation interference.
Common Questions
How do I wire a 3-wire thermostat to the R8845U1003?
The relay features dedicated terminals for R, C, and W connections, allowing the internal 120V to 24V transformer to power the thermostat while signaling the SPST switches.
Can this relay be used for zone valve control?
Yes, it is frequently used to bridge low-voltage thermostat signals with line-voltage circulator pumps or as a multizone furnace relay interface.
Does this unit support normally closed (NC) configurations?
The R8845U1003 uses SPST switches in a normally open configuration. For NC requirements, the RA889A series is the recommended alternative.
This item is not eligible for free shipping.
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: $96.61
-65%$96.61
$33.81Resideo R8845U1003 Relay
The Resideo R8845U1003 Universal Switching Relay is a versatile solution designed for professional contractors managing hydronic heating systems or line voltage equipment control. This unit provides reliable 2 or 3-wire thermostat control for high-voltage devices, featuring a 120Vac primary voltage transformer and two SPST switches. It also includes an integrated powerpile-rated low-voltage SPST relay, making it a critical component for multizone relay installations. Built to withstand demanding mechanical rooms, it operates efficiently within an ambient temperature range of -20°F to 120°F. The R8845U1003 relay is rated for 7.4 Amps full load and 44.4 Amps locked rotor at 120Vac. If your application specifically requires normally closed contacts, use the RA889A series instead. This Honeywell switching relay is optimized for HVAC control wiring, ensuring circulator pump control and fan logic are handled with industrial-grade durability and thermostat-to-line-voltage compatibility.
Key Benefits
- Universal Application: Replaces a wide range of standard switching relays for residential and light commercial hydronic systems.
- High Amperage Rating: Robust 7.4 Amp full load capacity allows for direct control of heavy-duty circulators and motors.
- PowerPile Compatibility: Includes specialized low voltage relays suitable for millivolt or standard 24V thermostat applications.
- Flexible Wiring: Supports both 2-wire and 3-wire thermostat configurations for streamlined field installations.
- Durable Construction: Engineered to function in high-humidity environments (up to 90% RH) without condensation interference.
Common Questions
How do I wire a 3-wire thermostat to the R8845U1003?
The relay features dedicated terminals for R, C, and W connections, allowing the internal 120V to 24V transformer to power the thermostat while signaling the SPST switches.
Can this relay be used for zone valve control?
Yes, it is frequently used to bridge low-voltage thermostat signals with line-voltage circulator pumps or as a multizone furnace relay interface.
Does this unit support normally closed (NC) configurations?
The R8845U1003 uses SPST switches in a normally open configuration. For NC requirements, the RA889A series is the recommended alternative.
This item is not eligible for free shipping.
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
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Description
The Resideo R8845U1003 Universal Switching Relay is a versatile solution designed for professional contractors managing hydronic heating systems or line voltage equipment control. This unit provides reliable 2 or 3-wire thermostat control for high-voltage devices, featuring a 120Vac primary voltage transformer and two SPST switches. It also includes an integrated powerpile-rated low-voltage SPST relay, making it a critical component for multizone relay installations. Built to withstand demanding mechanical rooms, it operates efficiently within an ambient temperature range of -20°F to 120°F. The R8845U1003 relay is rated for 7.4 Amps full load and 44.4 Amps locked rotor at 120Vac. If your application specifically requires normally closed contacts, use the RA889A series instead. This Honeywell switching relay is optimized for HVAC control wiring, ensuring circulator pump control and fan logic are handled with industrial-grade durability and thermostat-to-line-voltage compatibility.
Key Benefits
- Universal Application: Replaces a wide range of standard switching relays for residential and light commercial hydronic systems.
- High Amperage Rating: Robust 7.4 Amp full load capacity allows for direct control of heavy-duty circulators and motors.
- PowerPile Compatibility: Includes specialized low voltage relays suitable for millivolt or standard 24V thermostat applications.
- Flexible Wiring: Supports both 2-wire and 3-wire thermostat configurations for streamlined field installations.
- Durable Construction: Engineered to function in high-humidity environments (up to 90% RH) without condensation interference.
Common Questions
How do I wire a 3-wire thermostat to the R8845U1003?
The relay features dedicated terminals for R, C, and W connections, allowing the internal 120V to 24V transformer to power the thermostat while signaling the SPST switches.
Can this relay be used for zone valve control?
Yes, it is frequently used to bridge low-voltage thermostat signals with line-voltage circulator pumps or as a multizone furnace relay interface.
Does this unit support normally closed (NC) configurations?
The R8845U1003 uses SPST switches in a normally open configuration. For NC requirements, the RA889A series is the recommended alternative.
This item is not eligible for free shipping.
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.
