YTHX9421R5127WW | Honeywell Prestige IAQ Thermostat with RedLINK Wireless & Multi-Stage Control

Honeywell · HVAC & Building Controls

Description  The Honeywell YTHX9421R5127WW Prestige IAQ Thermostat is a 2-wire, high-definition color touchscreen thermostat for residential or light commercial use. It supports multi-stage heating and cooling, along with integrated IAQ (Indoor Air Quality) management for humidification, dehumidification, and ventilation. Equipped with RedLINK wireless technology and a suite of smart features, it enables precise, convenient, and energy-efficient climate control.     Technical Specifications  Condition New/Never Used Surplus Brand Honeywell Category Thermostats Part Number YTHX9421R5127WW Subcategory Prestige IAQ Thermostat Application Heat Pump / Conventional / IAQ Control Heat Stages 4 Heat / 3 Heat (Conventional) Cool Stages 2 Cool Programmability 7-Day Programmable User Interface High-Definition Color Touchscreen Mounting Orientation Horizontal Wireless Connectivity RedLINK, Wi-Fi Temperature Control Accuracy +/- 1°F Temperature Range (Cooling) 50°F – 99°F Temperature Range (Heating) 40°F – 90°F Voltage 24V Low Voltage Fan Control Yes Auto Changeover Yes Humidity Control Yes Operating Humidity 5–90% RH, Non-Condensing Height 4-23/25" Width 6-2/5" Depth 1-19/46" Weight 1.2 lbs   Information About YTHX9421R5127WW The YTHX9421R5127WW is part of Honeywell’s Prestige IAQ line, designed for 2-wire connectivity with an Equipment Interface Module. It is compatible with heat pumps, conventional systems, and IAQ devices, supporting multiple stages of heating and cooling. RedLINK wireless communication allows integration with internet gateways, sensors, and remote controls for flexible operation. Its programmable interface, service logs, and customizable alerts provide both users and technicians with actionable data, improving comfort and maintenance efficiency. Key Features: Multi-Stage Control: Supports up to 4 heat/2 cool stages for heat pumps and 3 heat/2 cool for conventional systems. Integrated IAQ Management: Three universal contacts control humidification, dehumidification, and ventilation. RedLINK Wireless Technology: Connects to RedLINK Internet Gateway, sensors, and remote controls for enhanced convenience. Smart Schedule: Patented interview-based programming allows fast setup for any lifestyle. Performance Monitoring: Delta T alerts, diagnostics, and performance logs track system efficiency and health. Customizable Service Reminders: Remind users of maintenance, warranty expiration, or system alerts. USB Connectivity: Transfer installer setup, events, holidays, and add custom dealer logos. Tri-Lingual Display: Offers English, French, and Spanish options for versatile usage. The YTHX9421R5127WW delivers the reliability and precision required for advanced residential and light commercial climate and IAQ management.

Brand: Honeywell · Category: HVAC & Building Controls

Key features

• Multi-Stage Control: Supports up to 4 heat/2 cool stages for heat pumps and 3 heat/2 cool for conventional systems.
• Integrated IAQ Management: Three universal contacts control humidification, dehumidification, and ventilation.
• RedLINK Wireless Technology: Connects to RedLINK Internet Gateway, sensors, and remote controls for enhanced convenience.
• Smart Schedule: Patented interview-based programming allows fast setup for any lifestyle.
• Performance Monitoring: Delta T alerts, diagnostics, and performance logs track system efficiency and health.
• Customizable Service Reminders: Remind users of maintenance, warranty expiration, or system alerts.
• USB Connectivity: Transfer installer setup, events, holidays, and add custom dealer logos.
• Tri-Lingual Display: Offers English, French, and Spanish options for versatile usage.

Specifications

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