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THX9321 Prestige
THX9421 Prestige
with EIM
THX9421 Prestige
THX9321 Prestige

APPLICATION

The Prestige 2.0 and Prestige IAQ Systems feature an
effortless, 7-Day programmable color touchscreen thermostat
that provides control of temperature, humidification,
dehumidification, and ventilation for up to 4 Heat/2 Cool heat
pump systems or up to 3 Heat/2 Cool conventional systems
for residential and commercial applications.

FEATURES

• RedLINK™ Compatible
Increase your content and profit per job by including
RedLINK™ accessories that meet your customers comfort
and convenience needs. RedLINK accessories include the
Wireless Outdoor Sensor, Portable Comfort Control (PCC),
Equipment Interface Module (EIM), RedLINK Internet
Gateway, Wireless Indoor Sensor, TrueSTEAM™ humidi-
fier with Wireless Adapter, TrueZONE™ zoning panel with
Wireless Adapter, Vent Boost Remote and Entry/Exit
Remote.
• Customizable Service Reminders
Set up to 10 service reminders. Choose from the pre-set
options or customize your own. Reminders based on date
or the outdoor temperature.
®
IAQ with EIM
®
2.0
®
2.0 and
®
IAQ

• Delta T Alerts and Diagnostics

Alerts give customers a sense of security while allowing
you to service or replace the equipment prior to a loss of
heating or cooling. Based on limits you set at installation,
customers can be alerted when their system is not operat-
ing as expected. The system alert will instruct customers to
contact you for assistance. Requires Equipment Interface
Module.
• Delta T Installer Test
Save time by viewing Delta T while running a system test to
verify proper operation. Requires Equipment Interface
Module.
• Universal Inputs
EIM - S1, S2, S3, S4
Assignable inputs allow you to setup Indoor and Outdoor
Temperature Sensors, Discharge and Return Air Sensors
or Dry Contact Devices. Dry Contact Devices can be used
to trip pre-set or customized alerts on the thermostat home
screen. Requires Equipment Interface Module.
• Data Logs
The thermostat stores an Alerts Log, User Interactions Log
and a Performance Log to quickly determine if an issue is
caused by a system error or an accidental user error. Note:
The Performance Log only applies to the THX9421
thermostat.
• Selectable for Residential and Light Commercial
Applications
One thermostat does it all to meet the needs of Residential
and Light Commercial applications. Simply select Residen-
tial or Commercial during the installer setup. If Commercial
is selected, the thermostat will use commercial language,
meet building codes and offer 365 day holiday scheduling.
• USB Port for Quick Installer Setup
Save time by using a USB stick to upload installer settings,
and service reminders in one simple step.
• Selectable Sensors
When paired with a Wireless Indoor Sensor(s) you have
the ability to choose which sensor(s) to use for tempera-
ture, humidification and dehumidification. They can be
used in combination for temperature averaging—or individ-
ually—to condition humidity levels in separate spaces.

PRODUCT DATA

68-0311-02

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Summarization of Contents

PRODUCT DATA AND OVERVIEW
Application and System Features
Describes the system's capability for controlling temperature, humidification, dehumidification, and ventilation.
Product Specifications
Details thermostat features, system types, power methods, and electrical ratings.
SYSTEM INSTALLATION
Installation Guidelines and Best Practices
Covers safety, suitability checks, and general advice for installing the thermostat and accessories.
Finding Thermostat Password (Date Code)
Explains how to retrieve the thermostat password required for installer setup and diagnostics.
Equipment Interface Module (EIM) Installation
Provides step-by-step instructions for mounting and wiring the Equipment Interface Module.
Temperature Sensor Installation
Covers the placement and wiring for discharge, return, and indoor air temperature sensors.
Thermostat and Wallplate Mounting
Details the physical mounting process for the thermostat unit and its wallplate.
INITIAL SETUP AND ACCESSORY CONFIGURATION
Powering and Connecting RedLINK Accessories
Explains how to power accessories and the process of linking them to the thermostat.
Performing Initial Setup
Guides users through configuring system type, zoning, and module usage during the first setup.
Linking RedLINK Accessories
Describes the procedure for wirelessly connecting RedLINK accessories to the thermostat and EIM.
Completing Initial Setup
Finalizes the system configuration process after initial setup and accessory linking.
ADVANCED SETTINGS AND FEATURES
Installer Options Menu and System Configuration
Overview of installer options for system setup, diagnostics, data logs, and device management.
Advanced Features Overview
Details features like Adaptive Intelligent Recovery and P+I Control for enhanced system performance.
SYSTEM MONITORING AND DIAGNOSTICS
Alerts and Diagnostics Overview
Introduces system alerts, diagnostics, and how they monitor performance and notify users.
Delta T Diagnostics Setup and Limits
Guides on configuring Delta T diagnostics, sensor selection, and setting performance limits.
Data Logs Access and Usage
Explains how to access and utilize system data logs for troubleshooting and analysis.
SYSTEM OPERATION AND CONTROL MODES
Staging Control Settings
Covers differential settings for heat, cool, and backup heat stages for optimal comfort and efficiency.
Heat Pump and Backup Heat Operation
Explains heat pump operation with backup heat, including lockout modes and system staging.
INDOOR AIR QUALITY (IAQ) CONTROL SETUP
Humidification Control and Setup
Details setting humidity levels, window protection, and control options for humidifiers.
Dehumidification Control and Setup
Guides on setting up dehumidification using cooling systems or dedicated dehumidifier units.
Ventilation Control Setup
Explains configuring ventilation types, control methods, fan settings, and outdoor lockouts.
MAINTENANCE REMINDERS AND CUSTOMIZATION
IAQ Reminders Configuration
Details setting reminders for filters, bulbs, and other IAQ equipment maintenance tasks.
Custom Reminders Setup
Allows users to create personalized alerts for service, warranty renewals, or specific events.
SYSTEM MANAGEMENT AND UTILITIES
USB Port Functions for Data Transfer and Updates
Explains using the USB port to save settings, load dealer information, and update thermostat software.
Dealer Information and Software Updates
Covers loading dealer contact details and logo, and updating thermostat software via USB.
COMMERCIAL OPERATION FEATURES
Commercial Schedule Management
Covers schedule overrides, holiday settings, and custom events for commercial environments.
Commercial-Specific Operational Features
Explains features like occupancy mode, ramp rates, custom names, and remote setback for commercial use.
ACCESSORIES AND SENSOR OPERATION
Accessory Battery Replacement
Provides instructions for replacing batteries in wireless indoor/outdoor sensors and portable controls.
Optional Accessories Overview
Introduces various optional accessories like portable controls, sensors, gateways, and remotes.
Remote Indoor Sensor Operation and Setup
Details how remote sensors function for temperature, humidification, and dehumidification control.
CALIBRATION AND WIRING DIAGRAMS
Sensor Calibration Data
Provides resistance values for outdoor and indoor sensors at various temperature points.
Wiring Diagrams and Guides
Illustrates wiring configurations for EIM, thermostat, sensors, and various system components.
TROUBLESHOOTING AND COMPLIANCE
Troubleshooting Common Issues
Offers solutions for common system symptoms like blank screens, unresponsiveness, or poor readability.
Regulatory Compliance Information
Includes FCC and Industry Canada compliance statements and warnings for device operation.

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