TH8321R1001 Resideo VisionPRO® 8000 Programmable Thermostat

Resideo TH8321R1001/U VisionPRO® 8000 Programmable Thermostat, 40 - 90 deg F Heat, 50 - 99 deg F Cool, 3 Stages Heat


Manufacturer part number:





Resideo VisionPro 8000 with RedLink, 18-30Vac or 750mV, 7 Day Programmable, Up to 3 Heat/2 Cool Heat Pump or up to 2 Heat/2 Cool Conventional when used Standalone, Up to 4 Heat/2 Cool Heat Pump or UP to 3 Heat/2 Cool Conventional when used with the Equipment Interface Module, Heat-Off-Cool-Auto-Emergency Heat System Switching, Auto-On-Circulating-Follow Schedule Fan Switching, Auto or Manual Changeover, 40-90 Degree Heat Temperature Setting Range, 50-99 Degree Cool Temperature Setting Range, Battery or Hardwired, Screw Terminals, 5-90% RH Non Condensing Operating Humidity Range, 10-60% Humidification Setting Range, 40-80% RH Dehumidification Range, Includes a Set of Universal IAQ Contacts to Control Humidification, Dehumidification or Ventilation, 4-5/8 Inch L x 4-15/16 Inch W x 1-1/8 Inch D, Includes: UN 3091 Lithium Metal Battery

Whole-Home Comfort, Simplified

The VisionPRO® 8000 RedLINK® programmable thermostat allows homeowners to manage their entire home comfort system through one easy-to-use interface. With RedLINK® wireless technology, the thermost at allows use with RedLINK® Accessories such as wireless indoor sensors, wireless outdoor sensor, and EIM, or the RedLINK® Internet Gateway to help balance comfort, safety, and energy efficiency.

  • Thermostat works standalone or with the THM5421R1021 equipment interface module or with the TrueZONE® wireless adapter
  • 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
  • Light commercial language (occupied and unoccupied), schedule holidays and custom events, remote setback economizer and time of day. Remote setback requires the THM5421R1021 equipment interface module
  • Plain language setup no manual needed
  • 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 a user error. Saves time in troubleshooting and points the technician in the right direction. The alert and user interaction logs are viewable on a computer after you download them from the thermostat to a microSD card
  • 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
  • MicroSD port for copying the installer setup customizable reminders, custom events and holidays to multiple thermostats
  • MicroSD port for adding the dealer's contact information on the screen
  • 1 assignable output on the TH8321 model to control humidification, dehumidification, ventilation or a stage of heating cooling
  • 3 assignable outputs on the equipment interface module to control humidification, dehumidification, ventilation or a stage of heating cooling. The TH8110 and TH8320 models require the use of a wireless indoor sensor to control humidification and dehumidification
  • 1 assignable input can be used with a wired outdoor, indoor or discharge sensor
  • 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
  • Dual powered - battery or hardwired (C-wire)
  • Multiple staging options to provide comfort or energy savings

Application: Conventional and Heat Pump systems

Products specifications
Attribute nameAttribute value
ApplicationConventional or Heat Pump
ColorArctic White
Control Range40 - 90 deg F Heat, 50 - 99 deg F Cool
Differential+/-1 deg F
Dimensions4-5/8 Inch L x 4-15/16 Inch W x 1-1/8 Inch D
Fan SwitchingAuto-On-Circulate-Follow Schedule
ManufacturerResideo Honeywell Home
Mounting TypeHorizontal
Number of Stages3 Heat/2 Cool
Power SourceHardwired/Battery
Programs Per Week7
SeriesVisionPro 8000
Stages Cool2
Stages Heat3
System SwitchingHeat-Off-Cool Auto Emergency Heat
Temperature Settings Per Day4
Terminal DesignationsR, RC, C, W-O/B, W2-AUX/E, Y, Y2, G, A-L/A, K, U1 U1, S1 S1
TypeLow Voltage
Voltage Rating18/30 VAC, 50/60 Hz