Prestige THX9421R5021

Prestige® THX9421R Programmable Thermostat, 32 - 120 deg F, 4 Stages Heat, 2-Stages Cool, High Definition Digital


Manufacturer part number:




Prestige® THX9421R Programmable Thermostat, 32 - 120 deg F, 4 Stages Heat, 2 Stages Cool, Temperature Settings Per Day: 4, Programs Per Week: 7, Terminal Designations: R, C, System Switching: Heat-Cool-Off, Fan Switching: Auto-On-Circulate, High Definition Digital Display, 18/30 VAC, Hardwired, Horizontal Mount, Premier White, 3-1/2 Inch H x 4-1/2 Inch W x 7/8 Inch D

  • 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
  • Selectable for residential and light commercial applications, meets commercial code and is title 24 compliant
  • Light 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
  • 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 deg F) for reliable and consistent temperature
  • Multiple staging options to provide comfort or energy savings
Products specifications
Attribute nameAttribute value
ApplicationConventional or Heat Pump
Brand NamePrestige®
ColorPremier White
Control Range32 - 120 deg F
Dimensions3-1/2 Inch H x 4-1/2 Inch W x 7/8 Inch D
DisplayHigh Definition Digital
Fan SwitchingAuto-On-Circulate
Mounting TypeHorizontal
Number of Stages4 Heat/2 Cool
Power SourceHardwired
Programs Per Week7
Stages Cool2
Stages Heat4
System SwitchingHeat-Cool-Off
Temperature Settings Per Day4
Terminal DesignationsR, C
TypeDigital, Low Voltage
Voltage Rating18/30 VAC