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
25 68-0311—07
2050 Geothermal Forced
Air System
None
Used for Cooling Only
Used for Heating and Cooling
Used for Heating
and Cooling
Both No This thermostat has the capability of
controlling Geothermal Radiant Heat,
Geothermal Forced Air and Backup Heat.
If this thermostat is not controlling the
Geothermal Forced Air System, select None.
This setting is typically used if the thermostat is
only controlling Geothermal Radiant Heat.
If this thermostat is using the Geothermal
Forced Air System for cooling and not for
heating, select Used for Cooling Only.
If this thermostat is using the Geothermal
Forced Air System for both heating and cooling,
select Used for Heating and Cooling.
2060 Reversing Valve
O/B
O (O/B on Cool)
B (O/B on Heat)
O/B on Cool Both No Only displayed if the equipment type is Air to
Air Heat Pump, Geothermal Heat Pump or
Geothermal Radiant Heat.
2070 Cool Stages /
Compressor Stages
1-4
1 if ISU 1010 is
Residential
2 if ISU 1010 is
Commercial
Both No Conventional:
Cool Stage 3 and 4 are only available if ISU
1010 is Commercial.
Cool Stage 3 and 4 must be wired to a universal
terminal (U1, U2 or U3).
Heat Pumps:
Maximum of 2 Compressor Stages for heat
pump systems.
2020,
2070
Heat Stages /
Backup Heat Stages
1 - 3
Default is 1
stage if ISU
1010
Application is
Residential
Default is 2
stages if ISU
1010
Application is
Commercial
Both No Maximum of 3 Heat Stages for conventional
systems.
Maximum of 2 Backup Heat Stages for systems
with more than 1 heating equipment type.
2080 What Terminals are
Wired to Cool - Stage
3?
None
U1
U2
U3
Default varies
based on
previous
selections
Commercial No Cool Stage 3 is only available if ISU 1010 is
Commercial.
Cool Stage 3 must be wired to a universal
terminal (U1, U2 or U3).
U1, U2 and U3 are normally open dry contacts
when configured for a stage of Cool. U1, U2
and U3 require power from a system
transformer or a separate transformer.
U3 is only available on the Equipment Interface
Module (EIM).
Table 4. Installer Setup (ISU) Table. (Continued)
ISU
Number
Installer Setup
Name Settings Default
Residential,
Commercial
or Both
Requires
EIM Notes