Resideo THX9421R5021WW Thermostat
The Resideo THX9421R5021WW is a high-performance Prestige IAQ 2-Wire Thermostat engineered for technicians managing complex residential or light commercial HVAC systems. This high-definition color touchscreen thermostat utilizes RedLINK wireless technology to provide comprehensive control over temperature and indoor air quality through a simplified 2-wire connection. When integrated with a Honeywell THM5421R1021 equipment interface module, it manages up to 4 stages of heating and 2 stages of cooling for heat pump systems, or 3-heat/2-cool stages for conventional setups. The 8.06 square inch display provides granular visibility into HVAC staging, delta T alerts, and integrated humidification and dehumidification control. Designed for versatile field application, it features selectable 7-day programming or non-programmable operation, tri-lingual support, and advanced diagnostics. Screw terminals facilitate secure hardwired connections, ensuring reliable communication with RedLINK accessories and sensors for precise environmental management across a 32-120 degree operating range.
Key Benefits- Simplified 2-Wire Installation: Enables full equipment control—including IAQ—using only two wires at the thermostat to streamline retrofits.
- Integrated IAQ Management: Dedicated contacts for controlling humidifiers, dehumidifiers, and ventilators without additional controls.
- Advanced HVAC Diagnostics: Real-time Delta T alerts and performance logs notify contractors of system inefficiencies before hardware failure.
- RedLINK Ecosystem Compatibility: Seamlessly pairs with wireless outdoor sensors, indoor sensors, and internet gateways for remote monitoring.
- Commercial Grade Logic: Includes title 24 compliance, keypad lockouts, and adaptive recovery for professional-grade performance.
Does this thermostat require a common wire?
The THX9421R5021WW power is handled by the Equipment Interface Module (EIM). You only need 2 wires from the EIM to the subbase to power the display and handle RedLINK signals.
Can I use this for heat pump and conventional systems?
Yes, it is configurable for both. It supports up to 4H/2C Heat Pump or 3H/2C Conventional systems through the EIM staging terminals.
How do I enable remote access and phone control?
To enable connectivity via the Total Connect Comfort app, you must pair this unit with a Resideo RedLINK Internet Gateway.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $373.48
-65%$373.48
$130.72Resideo THX9421R5021WW Thermostat
The Resideo THX9421R5021WW is a high-performance Prestige IAQ 2-Wire Thermostat engineered for technicians managing complex residential or light commercial HVAC systems. This high-definition color touchscreen thermostat utilizes RedLINK wireless technology to provide comprehensive control over temperature and indoor air quality through a simplified 2-wire connection. When integrated with a Honeywell THM5421R1021 equipment interface module, it manages up to 4 stages of heating and 2 stages of cooling for heat pump systems, or 3-heat/2-cool stages for conventional setups. The 8.06 square inch display provides granular visibility into HVAC staging, delta T alerts, and integrated humidification and dehumidification control. Designed for versatile field application, it features selectable 7-day programming or non-programmable operation, tri-lingual support, and advanced diagnostics. Screw terminals facilitate secure hardwired connections, ensuring reliable communication with RedLINK accessories and sensors for precise environmental management across a 32-120 degree operating range.
Key Benefits- Simplified 2-Wire Installation: Enables full equipment control—including IAQ—using only two wires at the thermostat to streamline retrofits.
- Integrated IAQ Management: Dedicated contacts for controlling humidifiers, dehumidifiers, and ventilators without additional controls.
- Advanced HVAC Diagnostics: Real-time Delta T alerts and performance logs notify contractors of system inefficiencies before hardware failure.
- RedLINK Ecosystem Compatibility: Seamlessly pairs with wireless outdoor sensors, indoor sensors, and internet gateways for remote monitoring.
- Commercial Grade Logic: Includes title 24 compliance, keypad lockouts, and adaptive recovery for professional-grade performance.
Does this thermostat require a common wire?
The THX9421R5021WW power is handled by the Equipment Interface Module (EIM). You only need 2 wires from the EIM to the subbase to power the display and handle RedLINK signals.
Can I use this for heat pump and conventional systems?
Yes, it is configurable for both. It supports up to 4H/2C Heat Pump or 3H/2C Conventional systems through the EIM staging terminals.
How do I enable remote access and phone control?
To enable connectivity via the Total Connect Comfort app, you must pair this unit with a Resideo RedLINK Internet Gateway.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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Description
The Resideo THX9421R5021WW is a high-performance Prestige IAQ 2-Wire Thermostat engineered for technicians managing complex residential or light commercial HVAC systems. This high-definition color touchscreen thermostat utilizes RedLINK wireless technology to provide comprehensive control over temperature and indoor air quality through a simplified 2-wire connection. When integrated with a Honeywell THM5421R1021 equipment interface module, it manages up to 4 stages of heating and 2 stages of cooling for heat pump systems, or 3-heat/2-cool stages for conventional setups. The 8.06 square inch display provides granular visibility into HVAC staging, delta T alerts, and integrated humidification and dehumidification control. Designed for versatile field application, it features selectable 7-day programming or non-programmable operation, tri-lingual support, and advanced diagnostics. Screw terminals facilitate secure hardwired connections, ensuring reliable communication with RedLINK accessories and sensors for precise environmental management across a 32-120 degree operating range.
Key Benefits- Simplified 2-Wire Installation: Enables full equipment control—including IAQ—using only two wires at the thermostat to streamline retrofits.
- Integrated IAQ Management: Dedicated contacts for controlling humidifiers, dehumidifiers, and ventilators without additional controls.
- Advanced HVAC Diagnostics: Real-time Delta T alerts and performance logs notify contractors of system inefficiencies before hardware failure.
- RedLINK Ecosystem Compatibility: Seamlessly pairs with wireless outdoor sensors, indoor sensors, and internet gateways for remote monitoring.
- Commercial Grade Logic: Includes title 24 compliance, keypad lockouts, and adaptive recovery for professional-grade performance.
Does this thermostat require a common wire?
The THX9421R5021WW power is handled by the Equipment Interface Module (EIM). You only need 2 wires from the EIM to the subbase to power the display and handle RedLINK signals.
Can I use this for heat pump and conventional systems?
Yes, it is configurable for both. It supports up to 4H/2C Heat Pump or 3H/2C Conventional systems through the EIM staging terminals.
How do I enable remote access and phone control?
To enable connectivity via the Total Connect Comfort app, you must pair this unit with a Resideo RedLINK Internet Gateway.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
