Honeywell Prestige 2.0 THX9421

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PRODUCT DATA

68-0311-07

THX9321 Prestige

2.0 and

THX9421 Prestige

IAQ with EIM

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, Tru-

eSTEAM™ humidifier with Wireless Adapter,

TrueZONE™ zoning panel with Wireless Adapter, Vent

Boost Remote and Entry/Exit Remote.

• Also Compatible with Equipment Remote Module

(ERM) ERM5220R

• 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.

• 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 installa-

tion, customers can be alerted when their system is not

operating 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 Resi-

dential and Light Commercial applications. Simply

select Residential 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 set-

tings, 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 tem-

perature, humidification and dehumidification. They

can be used in combination for temperature averag-

ing—or individually—to condition humidity levels in

separate spaces.

THX9321 Prestige

2.0

THX9421 Prestige

IAQ with EIM

Main Page

Brand	Honeywell
Model	Prestige 2.0 THX9421
Category	Thermostat
Language	English

Brand

Honeywell

Model

Prestige 2.0 THX9421

FEATURES

RedLINK Compatible

Enables advanced accessories for enhanced comfort and profit.

Customizable Service Reminders

Allows setting up to 10 service reminders based on date or temp.

Delta T Alerts and Diagnostics

Alerts customers to potential system issues for proactive service.

Universal Inputs

Assignable inputs for sensors, dry contacts, etc.

Data Logs

Stores logs for troubleshooting system issues.

Selectable for Residential and Light Commercial Applications

Versatile for different installation types.

USB Port for Quick Installer Setup

Speeds up installer setup with USB stick.

Selectable Sensors

Allows choosing sensors for optimal comfort control.

SPECIFICATIONS

Terminal Designations

Lists and describes terminal functions for EIM and THX9421/THX9321.

RedLINK Communication

Details the wireless communication frequency and re-sync time.

Temperature & Humidity Ranges

Defines operational limits for temperature and humidity settings.

INSTALLER TESTS

Equipment Test

Tests heating, cooling, fan, and IAQ equipment functions.

Data Logs

Alerts Log

Records all system alerts generated.

User Interactions Log

Tracks user-initiated changes and actions.

Performance Logs

Captures detailed operational data for system analysis.

Honeywell Prestige 2.0 THX9421 - User Manual

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