THX9321 & THX9421 Product Data

ManualsBrandsHoneywell ManualsThermostatsRedesigned Prestige IAQ Kit, 4H/2C

Table Of Contents

Application
Features
Contents
Specifications
System Installation
- When Installing this Product...
- Finding Your Password (Date Code)
Installation Options
- Guidelines for Installing RedLINK Devices
- Installing Equipment Interface Module (if used)
- Wiring 24 Vac Common
- Selecting Discharge and Return Air Temperature Sensor Mounting Locations
- Selecting Return Air Temperature Sensor Mounting Location
- Installing Discharge and Return Air Temperature Sensors
- Selecting Thermostat Location
- Installing Wallplate
Power Optional REDLINK™ Accessories
Performing Initial Setup
- Linking Thermostat to Equipment Interface Module (if used)
- Linking RedLINK™ Accessories
- Completing Initial Setup
- Adding RedLINK Accessories to the Thermostat
- Locating the Connect Buttons on RedLINK Accessories
- Finding Your Password (Date Code) to Access Installer Options
- Installer Options
- Making Changes to Installer Setup
Installer Tests
- Accessing Installer Tests
- Using the Equipment Test
- Using the Wireless Signal Strength Test
- Mounting Optional Accessories
Operation
- Setting the time/date
- Setting the fan
- Setting system mode
- Preset Energy-Saving Schedules
- Adjusting program schedules
- Overriding schedules: residential use
- Overriding schedules: commercial use
- Viewing equipment status
- Setting vacation hold: residential use
- Setting holiday/event schedules: commercial use
- Setting custom events: commercial use
- Setting holiday schedule: commercial use
- Setting holiday override: commercial use
- Initiating occupancy mode: commercial use
- Remote setback: commercial use
- Adjusting humidification settings
- Adjusting dehumidification settings: residential use
- Adjusting dehumidification settings: commercial use
- Adjusting ventilation settings
- Customizing screen color
- Setting preferences
- Cleaning the thermostat screen
- Adjusting security settings
- Viewing dealer information
- Advanced Features
- Installer options
- Using the temperature display
- Using the humidity display
Universal Outputs (U1, U2, U3)
Universal Inputs (S1, S2, S3, S4)
Alerts and Diagnostics
- Delta T Diagnostics
- Before You Set Up Delta T Diagnostics
- Setting up Alerts and Diagnostics
- Delta T Alerts
- Delta T Alerts and Utility Saver Switches
- Data Logs
- Dry Contact Alerts
- Set Up the Dry Contact Alerts
- Staging Control
Heat Pump and Backup Heat Operation
- Heat pump with outdoor temperature lockouts
- Geothermal Radiant Heat
Indoor Air Quality (IAQ) Control
- Humidification
- Dehumidification - Residential
- Dehumidification - Commercial
- Ventilation
IAQ Reminders
Customizable Reminders
USB Port
- Loading Dealer Information
- Updating Thermostat Software (Prestige IAQ Only)
Commercial Features
- Overriding schedules: commercial use
- Setting holiday/event schedules: commercial use
- Setting custom events: commercial use
- Setting holiday schedule: commercial use
- Setting holiday override: commercial use
- Initiating occupancy mode: commercial use
- Ramp Rates
- Custom Names
- Remote Setback
- Economizer and Time of Day (TOD) Operation
- Pre-Occupancy Purge
- Battery Replacement
Optional Accessories
Portable Comfort Control
Remote Indoor Sensors
- Indoor Sensor Operation
- Wireless Indoor Sensor
Backup Control
Replacing a Thermostat
Replacing an Equipment Interface Module
Wiring
- EIM Wiring Diagrams
- THX9321 Thermostat Wiring Diagrams
- THX9321 Thermostat Wiring Diagrams Using Universal Relays to Control Heating or Cooling
- Wiring IAQ Equipment or a Heat/Cool Stage to the Universal Terminals
- Economizer Module Wiring Diagrams
- Wiring C7089U1006 Outdoor Sensor
- Wiring guide — Wired Indoor Sensors
Zoning
- Zoning and Humidification
- Zoning and Ventilation
- TrueDRY dehumidifier with Zoning
- Zoning FAQs
Troubleshooting
Regulatory Information

THX9321 PRESTIGE

2.0 AND THX9421 PRESTIGE

IAQ WITH EIM

68-0311—02 80

Adjusting dehumidification settings:

commercial use

This feature can control a dehumidifier or use your air

conditioner to reduce humidity.

1. Touch MENU and select Dehumidification.

Fig. 116.

2. Select Auto.

3. Move slider bar to select humidity level.

Fig. 117.

4. Touch Done to save your settings. Touch Cancel to

ignore changes.

If your air conditioner is used to control humidity, the

thermostat may use the following methods to maintain

humidity:

• Cool from 1° to 5° F lower than your temperature setting.

• Run cooling for the minimum “on” time to reduce humidity.

• Run cooling and heating at the same time to reduce

humidity without lowering the temperature.

Adjusting ventilation settings

1. Touch MENU, and select Ventilation.

Fig. 118.

2. Touch Setting, then select:

• Auto: Ventilation runs as programmed by the installer.

• Off: Ventilation remains off unless turned on using the

timer.

• On: Ventilation is always on.

3. Touch  or  to run ventilation temporarily. To turn it off,

set it to zero.

Fig. 119.

4. Touch More Settings to set maintenance reminders and

lockouts. Select Yes to prevent ventilation from running

during the Sleep or Unoccupied (commercial) program

periods or when outdoor conditions exceed values set by

the installer.

NOTE: If set up for humidification in heat mode, the ven-

tilator will turn on to remove excess humidity if

10% or more above your humidity setting.

Customizing screen color

You can customize the color of the thermostat screen to match

your décor.

1. Touch Menu.

2. Touch Color Themes.

Fig. 120.

3. Select one of the predefined screen colors or select Cus-

tom to define your own screen color.

Fig. 121.

Dehumidiﬁcaon

Sengs

Venlaon

Sengs

Seng:

Automac