Resideo YTHX9421R508/U Prestige Thermostat Kit

Product Description

The RESIDEO YTHX9421R508/U is a Prestige thermostat kit designed for whole-home comfort control in residential and light commercial HVAC systems. This kit provides the hardware needed to install or replace a Prestige-series programmable thermostat, giving HVAC technicians a complete solution for temperature management and system integration. The YTHX9421R508/U supports multi-stage heating and cooling configurations and is intended for installation by licensed HVAC professionals familiar with low-voltage control wiring and communicating thermostat systems.

This kit is suited for residential new-construction and retrofit applications where a high-capability programmable thermostat is specified. It is designed for use with forced-air heating and cooling systems and is a common choice when upgrading older single-stage or non-communicating thermostats to a full-featured Prestige-series control. Installation typically takes place at the thermostat sub-base location on an interior wall, with low-voltage wiring routed from the air handler or furnace control board.

Key Features

• Complete Prestige thermostat kit includes all components needed for installation
• Supports multi-stage heating and cooling HVAC systems
• Designed for low-voltage thermostat wiring configurations
• Suitable for residential and light commercial forced-air applications
• Packaged weight of 1.9 pounds for easy handling and transport on service calls

Compatibility

Designed as an OEM-style replacement and upgrade solution for residential and light commercial forced-air HVAC systems requiring a Prestige-series programmable thermostat.

Installation Notes

Installation should be performed by a licensed HVAC technician. Always power down the HVAC system at the disconnect or breaker before removing the existing thermostat or connecting low-voltage wiring. Mount the thermostat sub-base level on an interior wall away from direct sunlight, drafts, and heat sources. Follow all applicable local codes and manufacturer wiring diagrams when connecting control terminals.

Technical Specifications

• Weight: 1.9 pounds

Standard Information

• Brand: RESIDEO
• Manufacturer Part Number: YTHX9421R508/U