Spec Sheet
Table Of Contents
- Application
- Features
- Contents
- Specifications
- System Installation
- 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
- 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
- Heat Pump and Backup Heat Operation
- Indoor Air Quality (IAQ) Control
- IAQ Reminders
- Customizable Reminders
- USB Port
- 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
- 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
- Troubleshooting
- Regulatory Information
THX9321 PRESTIGE
®
2.0 AND THX9421 PRESTIGE
®
IAQ WITH EIM
85 68-0311—07
Installer options
Installer Options require a password and should only be
changed by a qualified technician.
To prevent unintended changes or damage to your
equipment, do not change these options yourself.
Fig. 145.
Using the temperature display
In some circumstances, the temperature displayed on the
Home screen may not match the temperature near the
thermostat.
If your system is set up to use remote indoor sensors, it
may be reading a sensor in another location.
Fig. 146.
Using the humidity display
In some circumstances, the humidity displayed on the
Home screen may not match humidity near the
thermostat.
Some systems are set up to use two sensors, one to
control humidification, the other for dehumidification.
These sensors are often installed in different locations.
Depending on how your thermostat was installed, the
thermostat Home screen will display humidity readings
from only one sensor.
Fig. 147.
UNIVERSAL OUTPUTS
(U1, U2, U3)
U1, U2, U3 are universal outputs that can be setup to
control IAQ equipment and a stage of heating or cooling in
the Installer Setup. Setup options are listed below. See
“THX9321 Thermostat Wiring Diagrams Using Universal
Relays to Control Heating or Cooling” beginning on
page 145 for more information.
Universal Output Options
THX9421 with Equipment Interface Module (U1, U2, U3):
• Humidification (ISU 8030)
• Dehumidification (ISU 9040)
• Ventilation (ISU 10020)
• Cool Stage 3 (ISU 2080)
• Cool Stage 4 (ISU 2090)
• Geothermal Radiant Heat (ISU 2030, 2040)
THX9321 Thermostat Only (U1, U2)
• Humidification (ISU 8030)
• Dehumidification (ISU 9040)
• Ventilation (ISU 10020)
• Cool Stage 3 (ISU 2080)
• Cool Stage 4 (ISU 2090)
• Conventional Heat Stage 3 (ISU 2100, 2140)
• Backup Heat Stage 2 for Heat Pumps (ISU 2170)
• Geothermal Radiant Heat (ISU 2030, 2040)
MENU
Installer Opons
72
INDOOR
Temperature reading
depends on location
of sensor
45% Humidity
Humidity reading
depends on location
of sensor.