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Honeywell Prestige IAQ Comfort System - YTHX9421R5069

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Honeywell Prestige IAQ Comfort System - YTHX9421R5069

The Prestige® IAQ 2.0 thermostat is a 2 wire high definition color touch screen thermostat, 7 day programmable, configurable for residential and light commercial, up to 4 heat / 2 cool heat pump and up to 3 heat / 2 cool conventional, controls humidification, dehumidification and ventilation, provides Delta T Alerts and Diagnostics, works with the Equipment Interface Module and RedLINK accessories.

Control this thermostat over the internet with the new RedLINK Internet Gateway

This Prestige IAQ Thermostat Kit contains 

(1) THX9421R5013 Thermostat
(1) THM5421R1013 Equipment Interface Module
(1) C7089R1013 Wireless Outdoor Sensor
(2) C7735A1000 Duct Sensors


  • Control heating, cooling and IAQ equipment with only 2 wires at the thermostat. Heating, cooling and IAQ equipment wires to the Equipment Interface Module.
  • Patented interview based programming and installer setup.
  • RedLINK wireless communication.
  • Configurable 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 operating as expected with instructions to contact the dealer. Provides a sense of security and greater comfort while generating repeat business.
  • All Prestige® IAQ 2.0 systems 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. 
  • 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.

Application Up to 4 Heat/2 Cool Heat Pumps
Application Up to 3 Heat/2 Cool Conventional Systems
Programmability 7-Day Multiple Day Programming or Non-Programmable
Changeover Auto or Manual
Color Arctic White
Switch Positions (System) HEAT-OFF-COOL-AUTO-EM.HEAT
Switch Positions (Fan) AUTO-ON-CIRC
Power Method Hardwired
Terminal Designations R, C then RedLINK to Equipment Interface Module
Electrical Ratings 18 to 30 Vac
Frequency 60 Hz
Frequency 50 Hz
Electrical Connections Screw terminals
Operating Temperature Range (F) 32 F to 120 F
Operating Temperature Range (C) 0 C to 48.9 C
Setting Temperature Range (F) Heat: 40 F to 90 F; Cool 50 F to 99F
Setting Temperature Range (C) Heat: 4.5 C to 32.0 C; Cool: 10 C to 37.0 C
Humidity Setting Range Cooling: 40 to 80% RH. Heating: 10 to 60% RH.
Stages Up to 4 Heat / 2 Cool Heat Pump or Up to 3 Heat / 2 Cool Conventional
Outdoor Sensor N/A
Remote Sensor N/A
Operating Humidity Range (% RH) 5 to 90% RH, non-condensing
Includes THX9421R5013 Thermostat, THM5421R1013 Equipment Interface Module, two C7735A1000 Duct Sensors, C7089R1013 Wireless Outdoor Sensor
Comments Tri-Lingual Display (selectable for English, French or Spanish)
Used With RedLINKT enabled thermostats and accessories
Display Size 8.06 sq in.
Humidification Setting Range 10 to 60% RH.
Dehumidification Setting Range 40 to 80% RH.
Voltage 18 to 30 Vac