Resideo YTHX9421R5127WW Thermostat
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Resideo YTHX9421R5127WW Thermostat

Resideo YTHX9421R5127WW Thermostat

Professional HVAC contractors and facility managers require the high-performance control and simplified installation found in the Resideo YTHX9421R5127WW Prestige IAQ 2-Wire Thermostat Kit. This advanced Prestige IAQ kit utilizes an Equipment Interface Module (EIM) to reduce thermostat wiring to just two wires at the wall, making it an ideal choice for retrofitting smart thermostat technology into existing structures without pulling new wire. The system manages complex staging for up to 4 Heat/2 Cool Heat Pump systems and 3 Heat/2 Cool Conventional systems, providing precise +/- 1°F temperature accuracy. By integrating RedLINK technology, this Honeywell Home RedLINK thermostat connects seamlessly to a suite of wireless accessories, including the included RedLINK Internet Gateway for remote monitoring. The high-definition color touchscreen offers a trilingual interface and patented interview-based setup to streamline commissioning, while built-in Delta T diagnostics and assignable IAQ contacts provide total control over humidification, dehumidification, and ventilation hardware.

Key Benefits
  • Streamlined Installation: The 2-wire design at the thermostat allows for rapid RedLINK thermostat installation using existing wiring, with all equipment termination occurring at the EIM.
  • IAQ Integration: Standard universal contacts enable direct logic-based control for whole-house humidifiers and ventilators without additional relays.
  • Advanced Diagnostics: Delta T Alerts and system logs help technicians identify performance degradation or system malfunctions before they lead to critical failures.
  • Remote Accessibility: The RedLINK Internet Gateway provides robust remote access via the Total Connect Comfort app, supporting up to 4 thermostats per gateway.
  • Application Flexibility: Selectable residential or light commercial modes with occupancy sensor inputs ensure compliance with commercial building codes and Title 24 standards.
Common Questions

Is this kit compatible with dual fuel systems?
Yes, the YTHX9421R5127WW supports dual fuel heat pump compatibility when paired with an outdoor sensor to manage balance point lockouts between the heat pump and auxiliary furnace.

Can I add wireless sensors to this system?
Absolutely. This kit is built on the RedLINK wireless protocol, allowing the addition of up to six indoor sensors for temperature averaging and one outdoor sensor for real-time weather data and humidity control logic.

Does this thermostat require a C-wire?
The thermostat itself uses only two wires (R and C) to communicate with the Equipment Interface Module (EIM), which provides the 24V power. All traditional system wires ($Y, W, G$, etc.) run directly to the EIM at the air handler or furnace.

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.

$451.41
Resideo YTHX9421R5127WW Thermostat
$451.41

Resideo YTHX9421R5127WW Thermostat

Professional HVAC contractors and facility managers require the high-performance control and simplified installation found in the Resideo YTHX9421R5127WW Prestige IAQ 2-Wire Thermostat Kit. This advanced Prestige IAQ kit utilizes an Equipment Interface Module (EIM) to reduce thermostat wiring to just two wires at the wall, making it an ideal choice for retrofitting smart thermostat technology into existing structures without pulling new wire. The system manages complex staging for up to 4 Heat/2 Cool Heat Pump systems and 3 Heat/2 Cool Conventional systems, providing precise +/- 1°F temperature accuracy. By integrating RedLINK technology, this Honeywell Home RedLINK thermostat connects seamlessly to a suite of wireless accessories, including the included RedLINK Internet Gateway for remote monitoring. The high-definition color touchscreen offers a trilingual interface and patented interview-based setup to streamline commissioning, while built-in Delta T diagnostics and assignable IAQ contacts provide total control over humidification, dehumidification, and ventilation hardware.

Key Benefits
  • Streamlined Installation: The 2-wire design at the thermostat allows for rapid RedLINK thermostat installation using existing wiring, with all equipment termination occurring at the EIM.
  • IAQ Integration: Standard universal contacts enable direct logic-based control for whole-house humidifiers and ventilators without additional relays.
  • Advanced Diagnostics: Delta T Alerts and system logs help technicians identify performance degradation or system malfunctions before they lead to critical failures.
  • Remote Accessibility: The RedLINK Internet Gateway provides robust remote access via the Total Connect Comfort app, supporting up to 4 thermostats per gateway.
  • Application Flexibility: Selectable residential or light commercial modes with occupancy sensor inputs ensure compliance with commercial building codes and Title 24 standards.
Common Questions

Is this kit compatible with dual fuel systems?
Yes, the YTHX9421R5127WW supports dual fuel heat pump compatibility when paired with an outdoor sensor to manage balance point lockouts between the heat pump and auxiliary furnace.

Can I add wireless sensors to this system?
Absolutely. This kit is built on the RedLINK wireless protocol, allowing the addition of up to six indoor sensors for temperature averaging and one outdoor sensor for real-time weather data and humidity control logic.

Does this thermostat require a C-wire?
The thermostat itself uses only two wires (R and C) to communicate with the Equipment Interface Module (EIM), which provides the 24V power. All traditional system wires ($Y, W, G$, etc.) run directly to the EIM at the air handler or furnace.

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

Shipping & Returns

Description

Professional HVAC contractors and facility managers require the high-performance control and simplified installation found in the Resideo YTHX9421R5127WW Prestige IAQ 2-Wire Thermostat Kit. This advanced Prestige IAQ kit utilizes an Equipment Interface Module (EIM) to reduce thermostat wiring to just two wires at the wall, making it an ideal choice for retrofitting smart thermostat technology into existing structures without pulling new wire. The system manages complex staging for up to 4 Heat/2 Cool Heat Pump systems and 3 Heat/2 Cool Conventional systems, providing precise +/- 1°F temperature accuracy. By integrating RedLINK technology, this Honeywell Home RedLINK thermostat connects seamlessly to a suite of wireless accessories, including the included RedLINK Internet Gateway for remote monitoring. The high-definition color touchscreen offers a trilingual interface and patented interview-based setup to streamline commissioning, while built-in Delta T diagnostics and assignable IAQ contacts provide total control over humidification, dehumidification, and ventilation hardware.

Key Benefits
  • Streamlined Installation: The 2-wire design at the thermostat allows for rapid RedLINK thermostat installation using existing wiring, with all equipment termination occurring at the EIM.
  • IAQ Integration: Standard universal contacts enable direct logic-based control for whole-house humidifiers and ventilators without additional relays.
  • Advanced Diagnostics: Delta T Alerts and system logs help technicians identify performance degradation or system malfunctions before they lead to critical failures.
  • Remote Accessibility: The RedLINK Internet Gateway provides robust remote access via the Total Connect Comfort app, supporting up to 4 thermostats per gateway.
  • Application Flexibility: Selectable residential or light commercial modes with occupancy sensor inputs ensure compliance with commercial building codes and Title 24 standards.
Common Questions

Is this kit compatible with dual fuel systems?
Yes, the YTHX9421R5127WW supports dual fuel heat pump compatibility when paired with an outdoor sensor to manage balance point lockouts between the heat pump and auxiliary furnace.

Can I add wireless sensors to this system?
Absolutely. This kit is built on the RedLINK wireless protocol, allowing the addition of up to six indoor sensors for temperature averaging and one outdoor sensor for real-time weather data and humidity control logic.

Does this thermostat require a C-wire?
The thermostat itself uses only two wires (R and C) to communicate with the Equipment Interface Module (EIM), which provides the 24V power. All traditional system wires ($Y, W, G$, etc.) run directly to the EIM at the air handler or furnace.

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.

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