Contractors, home and building owners choose Honeywell for many reasons. For you, reliability, application flexibility and install ease stand out. For your customers, easy use, accuracy and design make Honeywell the most trusted thermostat name.

Features & Benefits

• 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
• Selectable for Residential and Light Commercial Applications
• Light Commercial - 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
• MicroSD Port for Copying the Installer Setup, Customizable Reminders, Custom Events and Holidays to Multiple Thermostats
• MicroSD Port for Adding the Dealers 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)
• Meets Commercial Code and is Title 24 Compliant
• Energy Star® Rated

Specifications

• Type: 7 Day Programmable/Non-Programmable, 3-Heat/2-Cool Heat Pump, 2-Heat/2-Cool Conventional, Auto/Manual Changeover
• Color: Arctic White
• Voltage Rating: 18 to 30 Volt AC/750 Millivolt 50/60 Hertz
• Temperature Rating: 32 to 120 Deg F
• Size: 4-15/16 Inch Width x 1-1/8 Inch Depth x 4-5/8 Inch Height
• Terminal Designation R, RC, C, W-O/B, W2-AUX/E, Y, Y2, G, A-L/A, K, S1 S1
• Display Size 10 Square Inch Touchscreen
• Switch Position Heat-Off-Cool-Auto (System), Auto-On-Circ-Follow Schedule (Fan)
• Power Method Battery/Hardwired
• Humidity Rating 5 to 90 Percent RH (Non-Condensing)
• Setting Temperature Rating 40 to 90 Deg F (Heat), 50 to 99 Deg F (Cool)
• Used With standalone or with optional THM5421R1021 Equipment Interface Module and RedLINK Accessory
• Technology RedLINK

• TH8110U1003 - Honeywell 7 Day, 1 Heat/1 Cool Thermostat
• TH8320R1003/U - Honeywell 7 Day, 3 Heat/2 Cool Thermostat With Built in Wi-Fi
• TH8320U1008 - Honeywell 7 Day, 3 Heat/2 Cool Thermostat