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
29 68-0311—02
2210 Backup Heat Fan
Operation
No Fan
Equipment Controls Fan
Thermostat Controls Fan
Default varies
based on
previous
selections
Both No This ISU is only displayed for heat pumps
when ISU 2180 Backup Heat Type is Other.
Backup Heat Fan Operation:
Electric Forced Air: Thermostat Controls
Fan
Standard Efficiency Gas Forced Air:
Equipment Controls Fan
High Efficiency Gas Forced Air: Equipment
Controls Fan
Oil Forced Air: Equipment Controls Fan
Hot Water Fan Coil: Thermostat Controls
Fan
Hot Water Radiant Heat: Not Applicable
2220 A-L/A Terminal
Setup
None
Time Of Day
Economizer
Heat Pump Failure Indication
None Commercial No This ISU is only displayed when ISU 1010
Application is Commercial.
Note: When the thermostat is setup for
Residential, the L/A terminal operates as
described under “Heat Pump Failure
Indication.” The L/A terminal requires no
setup for residential applications.
None: The A-L/A terminal is not used.
Time of Day: The A-L/A terminal is
energized during Occupied periods and
when the user overrides the temperature.
The terminal is de-energized during
Unoccupied periods and in Standby mode.
Economizer: The thermostat controls an
economizer module to provide ventilation
during Occupied periods and free cooling
when outdoor conditions are favorable. The
A-L/A terminal is energized during
Occupied periods and during a call for
cooling in Unoccupied periods. See
“Economizer and Time of Day (TOD)
Operation” beginning on page 126.
Notes: The economizer module determines
when outdoor conditions are favorable for
free cooling. Delta T Diagnostics is not
available when the thermostat is setup for
an Economizer.
Heat Pump Failure Indication: When 24
volts is detected on the L/A terminal
(compressor monitor), the thermostat
displays a message to alert the user when
the heat pump requires service. The L/A
terminal sends a continuous output to a
zone panel when the thermostat is set to
Emergency Heat mode. The zone panel will
not turn on the heat pump when a zone is
set to Emergency Heat mode.
Table 4. Installer Setup (ISU) Table. (Continued)
ISU
Number
Installer Setup
Name Settings Default
Residential,
Commercial
or Both
Requires
EIM Notes