Resideo thx1100b4/u Smart Thermostat Iaq Control

Product Description

The RESIDEO thx1100b4/u is a hardwired smart thermostat designed for residential and light commercial 24-volt AC HVAC systems. It features a 5-inch customizable touchscreen with selectable display languages and an onboard radar sensor for occupancy-based control. The unit supports indoor air quality monitoring and is compatible with gas, oil, electric warm air, hydronic, fan coil unit, and PTAC systems. Licensed HVAC technicians install this thermostat as part of a complete system upgrade or replacement, particularly where IAQ management and smart programming are required by the customer.

This thermostat is suited for residential and light commercial applications running 24 Vac systems. It supports up to 4 heat and 2 cool stages for heat pump systems, and up to 3 heat and 3 cool stages for conventional systems. Time-based or Smart Away programming modes allow for energy-efficient scheduling in both residential and commercial settings. Compatible accessories include the THP9045A C-wire adapter and the C7189R3010-2 room sensor, expanding system capability where additional sensors or wiring support is needed.

Key Features

• 5-inch customizable touchscreen with display selectable for English, French, or Spanish
• Onboard radar sensor for occupancy detection and Smart Away programming
• Supports indoor air quality monitoring with compatible IAQ equipment
• Up to 4 Heat/2 Cool for heat pump systems; up to 3 Heat/3 Cool for conventional systems
• Smart Home integration supported
• ENERGY STAR certified for energy efficiency compliance
• Includes UWP Wall Plate, Decorative Cover Plate with J-Box Adapter, and mounting hardware

Compatibility

Compatible with residential and light commercial 24 Vac systems including gas, oil, electric warm air, hydronic, fan coil unit, and PTAC configurations. Works with the THP9045A C-wire adapter and C7189R3010-2 room sensor.

Installation Notes

Installation should be performed by a licensed HVAC technician. Power down the HVAC system at the breaker and disconnect low-voltage wiring before removing the existing thermostat. Verify that a C-wire is present or use the compatible THP9045A C-wire adapter to ensure proper hardwired power. Follow NEC guidelines for low-voltage wiring and consult the included literature for terminal assignments and system configuration.

Technical Specifications

• Application: Residential or light commercial
• System Compatibility: Gas, Oil, Electric Warm Air, Hydronic, Fan Coil Unit, PTAC
• Voltage: 24 Vac hardwired
• Display Size: 5 inches
• Touchscreen: Yes
• Stages (Heat Pump): Up to 4 Heat / 2 Cool
• Stages (Conventional): Up to 3 Heat / 3 Cool
• Display Languages: English, French, Spanish
• Display Time Format: 12-hour (AM/PM) and 24-hour
• Modes of Operation: Heat, Cool, Auto, Off, Emergency Heat
• Program Type: Time-Based or Smart Away
• Heat-Cool Changeover: Auto or Manual
• Power Source: Hardwired
• Smart Home Integration: Yes
• ENERGY STAR Certified: Yes
• Warranty: 5 years

Standard Information

• Brand: RESIDEO
• Manufacturer Part Number: thx1100b4/u