THX9321 & THX9421 Product Data
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
68-0311—02 28
2170 What Terminals are
Wired to Backup
Heat - Stage 2?
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 2 backup
heat stages for heat pump applications.
When there are 2 backup heat stages,
backup heat stage 2 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.
2180 Backup Heat Type
Electric Forced Air
Standard Efficiency Gas Forced Air
High Efficiency Gas Forced Air
Oil Forced Air
Hot Water Fan Coil
Hot Water Radiant Heat
Other
Electric Forced
Air
Both No This ISU is only displayed when ISU 2010
Heating Equipment Type is Air to Air Heat
Pump, Geothermal Heat Pump or
Geothermal Radiant Heat and there is at
least one stage of backup heat.
See “Heat Pump and Backup Heat
Operation” beginning on page 100.
2190 External Fossil Fuel
Kit
Thermostat Controls Backup Heat
External Fossil Fuel Kit Controls
Backup Heat
Thermostat
Controls
Backup Heat
Both No This ISU is only displayed when ISU 2010
Heating Equipment Type is Air to Air Heat
Pump, Geothermal Heat Pump or
Geothermal Radiant Heat and ISU 2180
Backup Heat Type is Standard Efficiency
Gas Forced Air, High Efficiency Gas
Forced Air or Oil Forced Air.
2200 Backup Heat
Operation
NOT allowed to Run with Heat
Pump
Allowed to Run with Heat Pump
Default varies
based on
previous
selections
Both No This ISU is only displayed when ISU 2010
Heating Equipment Type is Air to Air Heat
Pump, Geothermal Heat Pump or
Geothermal Radiant Heat and ISU 2180
Backup Heat Type is Hot Water Fan Coil or
Other.
Not Allowed to Run with Heat Pump: The
thermostat turns off the heat pump when it
calls for backup heat.
Allowed to Run with Heat Pump: The
thermostat keeps the heat pump on when it
calls for backup heat.
Table 4. Installer Setup (ISU) Table. (Continued)
ISU
Number
Installer Setup
Name Settings Default
Residential,
Commercial
or Both
Requires
EIM Notes