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
27 68-0311—07
2130 Backup Heat Stages
0 - 2
1 Both No This ISU is only displayed when a backup heat
source is selected at ISU 2120 Backup Heat
Type.
Maximum of 2 Backup Heat stages.
2140 What Terminals are
Wired to Backup
Heat?
None
U1
U2
Default varies
based on
previous
selections
Both No THX9321 Thermostat Only:
This ISU is only displayed on the THX9321
thermostat when it is wired directly to the
equipment (Equipment Interface Module is
NOT used).
The thermostat can support up to 3
conventional heat stages. When there are a
total of 3 conventional heat stages, the last
stage of heat must be wired to U1 or U2.
U1 and U2 are normally open dry contacts
when configured for a stage of Heat. U1 and U2
require power from a system transformer or a
separate transformer.
2150 Backup Heat
Operation
NOT Allowed to Run with Primary
Heat
Allowed to Run with Primary Heat
NOT allowed to
run with Primary
Heat
Both No This ISU is only displayed when ISU 2010
Heating Equipment Type is Hot Water Fan Coil,
Electric Forced Air or Other.
When ISU 2010 Heating Equipment Type is
Hot Water Fan Coil, Electric Forced Air or Other,
you can select how the Backup Heat operates.
The thermostat can be setup to keep the
primary heat source on when it calls for Backup
Heat or the thermostat can be setup to turn off
the primary heat source when it calls for
Backup Heat.
When ISU 2010 Heating Equipment Type is
Hot Water Radiant Heat, the thermostat keeps
the Hot Water Radiant Heat on when it calls for
Backup Heat.
When ISU 2010 Heating Equipment Type is
Steam, the thermostat keeps the Steam Heat on
when it calls for Backup Heat.
2160 Backup Heat Fan
Operation
No Fan
Equipment Controls Fan
Thermostat Controls Fan
Thermostat
Controls Fan
Both No This ISU is only displayed for conventional
systems when ISU 2120 Backup Heat Type is
Electric Forced Air, Hot Water Fan Coil or Other.
Backup Heat Fan Operation automatically
defaults to Equipment Controls Fan when ISU
2120 Backup Heat Type is Standard Efficiency
Gas Forced Air, High Efficiency Gas Forced Air
or Oil Forced Air.
No Fan is only displayed when ISU 2120
Backup Heat Type is Other.
Table 4. Installer Setup (ISU) Table. (Continued)
ISU
Number
Installer Setup
Name Settings Default
Residential,
Commercial
or Both
Requires
EIM Notes