Wireless Prestige IAQ Program Kit


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Product number:11998
Manufacturer number:YTHX9421R5085WW/U
Other models available
Additional Info
- Additional Info
- WiFi Specifications: Internet Gateway THM6000R7001/U Provides WiFi Capabilities
Application
Description
Display
Electrical
Features
Functional Features
General Information
Humidity
Logistical Information
Measurements
Mounting
Standards
Switch
Temperature
Product description
The Prestige® IAQ thermostat is a 2 wire high definition color touch screen thermostat, 7 day programmable and selectable for residential or light commercial use. Controls up to 4-stages of heat and 2-stages of cool in a heat pump system and up to 3-stages of heat and 2-stages of cool in a conventional system. Three sets of Universal IAQ contacts to control humidification, dehumidification, and ventilation. Four sensor inputs for wired sensors or dry contact devices. Works with the Equipment Interface Module and RedLINK® accessories including the RedLINK® Internet Gateway, Portable Comfort Control, Wireless Outdoor Sensor and Wireless Indoor Sensor.
Features
• Control heating, cooling and IAQ equipment with only 2 wires at the thermostat. Heating, cooling and IAQ equipment wires to the Equipment Interface Module.
• Smart Schedule - programs in seconds for any lifestyle
• Patented interview based programming and installer setup.
• RedLINK™ wireless communication.
• Increase profit per job by including RedLINK™ accessories that provide comfort and convenience. RedLINK™ accessories include the RedLINK™ Internet Gateway, Portable Comfort Control (PCC), Wireless Outdoor Sensor, Wireless Indoor Sensor, Wireless Entry/Exit Remote, Wireless Vent and Filter Boost Remote, TrueSTEAM™ humidifier with Wireless Adapter and TrueZONE® zoning panel with Wireless Adapter.
• Selectable for residential and light commercial applications. Meets commercial code and is title 24 compliant.
• Light commercial - commercial language (occupied and unoccupied), schedule holidays and custom events, remote setback, economizer and time of day.
• Delta T Alerts and Diagnostics informs customers when their system is not performing as expected with instructions to contact the dealer. Provides a sense of security and greater comfort while generating repeat business.
• All Prestige® IAQ kits come standard with a return and discharge air temperature sensor to measure Delta T.
• Alerts and User Interactions Log - Keeps a searchable history of alerts and setting changes to the thermostat to determine if there is a system malfunction or if the issue was caused by user error. Saves time in troubleshooting and points the technician in the right direction.
• Performance Logs - Keeps a history of heating and cooling performance. The performance log includes Minimum and Maximum Delta T, Minimum and Maximum Discharge Temperature, Minimum and Maximum Return Temperature, Minimum and Maximum Indoor Temperature/Humidity, Minimum and Maximum Outdoor Temperature/Humidity and Run Time. Quickly determine if the system is performing as expected and reduces service time on the job.
• Customizable Service Reminders allow dealers to remind their customers when its time to call for service, when their warranty is expiring and to provide customized alerts.
• USB port for transferring Installer Setup, Customizable Reminders, Custom Events and Holidays to multiple thermostats.
• USB port for adding the dealer's full color business logo on the screen.
• 3 assignable outputs to control humidification, dehumidification, ventilation and a stage of heating or cooling.
• 4 assignable inputs on the Equipment Interface Module can be used with wired outdoor, indoor or discharge sensors, occupancy sensor for remote setback and dry contact devices to trip pre-packaged or custom alerts such as a full drain pan or water leak.
• Extend wireless range of the Equipment Interface Module by connecting a THM4000R1000 Wireless Adapter to the ABCD terminals.
• Tri-lingual - English, French and Spanish display options.
• Precise temperature control (+/- 1° F) for reliable and consistent temperature.
• Multiple staging options to provide comfort or energy savings.
• THX9421R5021WW is ENERGY STAR® Certified
Features
• Control heating, cooling and IAQ equipment with only 2 wires at the thermostat. Heating, cooling and IAQ equipment wires to the Equipment Interface Module.
• Smart Schedule - programs in seconds for any lifestyle
• Patented interview based programming and installer setup.
• RedLINK™ wireless communication.
• Increase profit per job by including RedLINK™ accessories that provide comfort and convenience. RedLINK™ accessories include the RedLINK™ Internet Gateway, Portable Comfort Control (PCC), Wireless Outdoor Sensor, Wireless Indoor Sensor, Wireless Entry/Exit Remote, Wireless Vent and Filter Boost Remote, TrueSTEAM™ humidifier with Wireless Adapter and TrueZONE® zoning panel with Wireless Adapter.
• Selectable for residential and light commercial applications. Meets commercial code and is title 24 compliant.
• Light commercial - commercial language (occupied and unoccupied), schedule holidays and custom events, remote setback, economizer and time of day.
• Delta T Alerts and Diagnostics informs customers when their system is not performing as expected with instructions to contact the dealer. Provides a sense of security and greater comfort while generating repeat business.
• All Prestige® IAQ kits come standard with a return and discharge air temperature sensor to measure Delta T.
• Alerts and User Interactions Log - Keeps a searchable history of alerts and setting changes to the thermostat to determine if there is a system malfunction or if the issue was caused by user error. Saves time in troubleshooting and points the technician in the right direction.
• Performance Logs - Keeps a history of heating and cooling performance. The performance log includes Minimum and Maximum Delta T, Minimum and Maximum Discharge Temperature, Minimum and Maximum Return Temperature, Minimum and Maximum Indoor Temperature/Humidity, Minimum and Maximum Outdoor Temperature/Humidity and Run Time. Quickly determine if the system is performing as expected and reduces service time on the job.
• Customizable Service Reminders allow dealers to remind their customers when its time to call for service, when their warranty is expiring and to provide customized alerts.
• USB port for transferring Installer Setup, Customizable Reminders, Custom Events and Holidays to multiple thermostats.
• USB port for adding the dealer's full color business logo on the screen.
• 3 assignable outputs to control humidification, dehumidification, ventilation and a stage of heating or cooling.
• 4 assignable inputs on the Equipment Interface Module can be used with wired outdoor, indoor or discharge sensors, occupancy sensor for remote setback and dry contact devices to trip pre-packaged or custom alerts such as a full drain pan or water leak.
• Extend wireless range of the Equipment Interface Module by connecting a THM4000R1000 Wireless Adapter to the ABCD terminals.
• Tri-lingual - English, French and Spanish display options.
• Precise temperature control (+/- 1° F) for reliable and consistent temperature.
• Multiple staging options to provide comfort or energy savings.
• THX9421R5021WW is ENERGY STAR® Certified
| File name | Document type | Extension | File size | Updated at | |
|---|---|---|---|---|---|
| honeywell-ythx9421r5085ww-u-catalog-ast-honeywell-ythx9421r5085ww-u-catalog.pdf | 1.36 MB | 03.06.2026 | 06:50 | |||
| ythx9421-pdf-ast-nucomfortspec-ythx9421.pdf | 0.84 MB | 03.06.2026 | 06:50 | |||
| honeywell-ythx9421r5085ww-u-specification-sheet-ast-unilog-700200.pdf | 0.12 MB | 03.06.2026 | 06:50 |
Product
Product ID
Stock
Quantity
List price
Discount
Net price
ID: 46355
MFC: DC6000WF1001
ID: 79352
MFC: TH4210U2002ACME
ID: 91545
MFC: TH4210U2002SANDERS

ID: 11736
MFC: THM5421R1021

ID: 27659
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ID: 81993
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ID: 77911
MFC: THX321WFS3001W
ID: 11689
MFC: TH8110R1008/U
ID: 89812
MFC: TH2210DV1006
ID: 17482
MFC: TH4210U2002/U
ID: 11630
MFC: TH6210U2001/U
ID: 11603
MFC: TH5220D1029/U
ID: 11641
MFC: TH6220U2000/U
ID: 11648
MFC: TH6220WF2006/U

ID: 11717
MFC: TH8321WF1001/U
ID: 11708
MFC: TH8321R1001/U
ID: 11695
MFC: TH8320R1003/U

ID: 11720
MFC: TH9320WF5003/U

ID: 11609
MFC: TH5320R1002/U
ID: 11681
MFC: TH6320WF2003/U

ID: 11665
MFC: TH6320U2008/U
ID: 11258
MFC: T651A3018/U
ID: 11728
MFC: THM4000R1000

ID: 11731
MFC: THM5320R1000/U

ID: 11998
MFC: YTHX9421R5085WW/U
Additional Info
- Additional Info
- WiFi Specifications: Internet Gateway THM6000R7001/U Provides WiFi Capabilities
Application
Description
Display
Electrical
Features
Functional Features
General Information
Humidity
Logistical Information
Measurements
Mounting
Standards
Switch
Temperature
Product description
The Prestige® IAQ thermostat is a 2 wire high definition color touch screen thermostat, 7 day programmable and selectable for residential or light commercial use. Controls up to 4-stages of heat and 2-stages of cool in a heat pump system and up to 3-stages of heat and 2-stages of cool in a conventional system. Three sets of Universal IAQ contacts to control humidification, dehumidification, and ventilation. Four sensor inputs for wired sensors or dry contact devices. Works with the Equipment Interface Module and RedLINK® accessories including the RedLINK® Internet Gateway, Portable Comfort Control, Wireless Outdoor Sensor and Wireless Indoor Sensor.
Features
• Control heating, cooling and IAQ equipment with only 2 wires at the thermostat. Heating, cooling and IAQ equipment wires to the Equipment Interface Module.
• Smart Schedule - programs in seconds for any lifestyle
• Patented interview based programming and installer setup.
• RedLINK™ wireless communication.
• Increase profit per job by including RedLINK™ accessories that provide comfort and convenience. RedLINK™ accessories include the RedLINK™ Internet Gateway, Portable Comfort Control (PCC), Wireless Outdoor Sensor, Wireless Indoor Sensor, Wireless Entry/Exit Remote, Wireless Vent and Filter Boost Remote, TrueSTEAM™ humidifier with Wireless Adapter and TrueZONE® zoning panel with Wireless Adapter.
• Selectable for residential and light commercial applications. Meets commercial code and is title 24 compliant.
• Light commercial - commercial language (occupied and unoccupied), schedule holidays and custom events, remote setback, economizer and time of day.
• Delta T Alerts and Diagnostics informs customers when their system is not performing as expected with instructions to contact the dealer. Provides a sense of security and greater comfort while generating repeat business.
• All Prestige® IAQ kits come standard with a return and discharge air temperature sensor to measure Delta T.
• Alerts and User Interactions Log - Keeps a searchable history of alerts and setting changes to the thermostat to determine if there is a system malfunction or if the issue was caused by user error. Saves time in troubleshooting and points the technician in the right direction.
• Performance Logs - Keeps a history of heating and cooling performance. The performance log includes Minimum and Maximum Delta T, Minimum and Maximum Discharge Temperature, Minimum and Maximum Return Temperature, Minimum and Maximum Indoor Temperature/Humidity, Minimum and Maximum Outdoor Temperature/Humidity and Run Time. Quickly determine if the system is performing as expected and reduces service time on the job.
• Customizable Service Reminders allow dealers to remind their customers when its time to call for service, when their warranty is expiring and to provide customized alerts.
• USB port for transferring Installer Setup, Customizable Reminders, Custom Events and Holidays to multiple thermostats.
• USB port for adding the dealer's full color business logo on the screen.
• 3 assignable outputs to control humidification, dehumidification, ventilation and a stage of heating or cooling.
• 4 assignable inputs on the Equipment Interface Module can be used with wired outdoor, indoor or discharge sensors, occupancy sensor for remote setback and dry contact devices to trip pre-packaged or custom alerts such as a full drain pan or water leak.
• Extend wireless range of the Equipment Interface Module by connecting a THM4000R1000 Wireless Adapter to the ABCD terminals.
• Tri-lingual - English, French and Spanish display options.
• Precise temperature control (+/- 1° F) for reliable and consistent temperature.
• Multiple staging options to provide comfort or energy savings.
• THX9421R5021WW is ENERGY STAR® Certified
Features
• Control heating, cooling and IAQ equipment with only 2 wires at the thermostat. Heating, cooling and IAQ equipment wires to the Equipment Interface Module.
• Smart Schedule - programs in seconds for any lifestyle
• Patented interview based programming and installer setup.
• RedLINK™ wireless communication.
• Increase profit per job by including RedLINK™ accessories that provide comfort and convenience. RedLINK™ accessories include the RedLINK™ Internet Gateway, Portable Comfort Control (PCC), Wireless Outdoor Sensor, Wireless Indoor Sensor, Wireless Entry/Exit Remote, Wireless Vent and Filter Boost Remote, TrueSTEAM™ humidifier with Wireless Adapter and TrueZONE® zoning panel with Wireless Adapter.
• Selectable for residential and light commercial applications. Meets commercial code and is title 24 compliant.
• Light commercial - commercial language (occupied and unoccupied), schedule holidays and custom events, remote setback, economizer and time of day.
• Delta T Alerts and Diagnostics informs customers when their system is not performing as expected with instructions to contact the dealer. Provides a sense of security and greater comfort while generating repeat business.
• All Prestige® IAQ kits come standard with a return and discharge air temperature sensor to measure Delta T.
• Alerts and User Interactions Log - Keeps a searchable history of alerts and setting changes to the thermostat to determine if there is a system malfunction or if the issue was caused by user error. Saves time in troubleshooting and points the technician in the right direction.
• Performance Logs - Keeps a history of heating and cooling performance. The performance log includes Minimum and Maximum Delta T, Minimum and Maximum Discharge Temperature, Minimum and Maximum Return Temperature, Minimum and Maximum Indoor Temperature/Humidity, Minimum and Maximum Outdoor Temperature/Humidity and Run Time. Quickly determine if the system is performing as expected and reduces service time on the job.
• Customizable Service Reminders allow dealers to remind their customers when its time to call for service, when their warranty is expiring and to provide customized alerts.
• USB port for transferring Installer Setup, Customizable Reminders, Custom Events and Holidays to multiple thermostats.
• USB port for adding the dealer's full color business logo on the screen.
• 3 assignable outputs to control humidification, dehumidification, ventilation and a stage of heating or cooling.
• 4 assignable inputs on the Equipment Interface Module can be used with wired outdoor, indoor or discharge sensors, occupancy sensor for remote setback and dry contact devices to trip pre-packaged or custom alerts such as a full drain pan or water leak.
• Extend wireless range of the Equipment Interface Module by connecting a THM4000R1000 Wireless Adapter to the ABCD terminals.
• Tri-lingual - English, French and Spanish display options.
• Precise temperature control (+/- 1° F) for reliable and consistent temperature.
• Multiple staging options to provide comfort or energy savings.
• THX9421R5021WW is ENERGY STAR® Certified
| File name | Document type | Extension | File size | Updated at | |
|---|---|---|---|---|---|
| honeywell-ythx9421r5085ww-u-catalog-ast-honeywell-ythx9421r5085ww-u-catalog.pdf | 1.36 MB | 03.06.2026 | 06:50 | |||
| ythx9421-pdf-ast-nucomfortspec-ythx9421.pdf | 0.84 MB | 03.06.2026 | 06:50 | |||
| honeywell-ythx9421r5085ww-u-specification-sheet-ast-unilog-700200.pdf | 0.12 MB | 03.06.2026 | 06:50 |
Product
Product ID
Stock
Quantity
List price
Discount
Net price
ID: 46355
MFC: DC6000WF1001
ID: 79352
MFC: TH4210U2002ACME
ID: 91545
MFC: TH4210U2002SANDERS

ID: 11736
MFC: THM5421R1021

ID: 27659
MFC: TH1110D2009
ID: 81993
MFC: YTHM1004R3000/U

ID: 77911
MFC: THX321WFS3001W
ID: 11689
MFC: TH8110R1008/U
ID: 89812
MFC: TH2210DV1006
ID: 17482
MFC: TH4210U2002/U
ID: 11630
MFC: TH6210U2001/U
ID: 11603
MFC: TH5220D1029/U
ID: 11641
MFC: TH6220U2000/U
ID: 11648
MFC: TH6220WF2006/U

ID: 11717
MFC: TH8321WF1001/U
ID: 11708
MFC: TH8321R1001/U
ID: 11695
MFC: TH8320R1003/U

ID: 11720
MFC: TH9320WF5003/U

ID: 11609
MFC: TH5320R1002/U
ID: 11681
MFC: TH6320WF2003/U

ID: 11665
MFC: TH6320U2008/U
ID: 11258
MFC: T651A3018/U
ID: 11728
MFC: THM4000R1000

ID: 11731
MFC: THM5320R1000/U

ID: 11998
MFC: YTHX9421R5085WW/U
