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
103 68-0311—02
2. If optional remote wireless indoor sensors are installed,
you can choose which sensor you want to use for humid-
ification control. You can use a different sensor for dehu-
midification. See “Wireless Indoor Sensor” beginning on
page 130 for more information.
Fig. 209.
3. Select the terminals wired to the humidifier. See Fig.
210.
NOTE: U1, U2, and U3 are Normally Open Dry Con-
tacts that require power from the system trans-
former or a separate transformer. See “Wiring
IAQ Equipment or a Heat/Cool Stage to the
Universal Terminals” beginning on page 149.
Fig. 210.
4. Set Window Protection settings. See Fig. 211.
NOTE: Outdoor sensor is required for Window Protec-
tion.
Fig. 211.
5. Select the system mode(s) to allow humidification. See
Fig. 212.
NOTE: Heat includes Heat, Emergency Heat and Auto.
If the system is in Auto mode, the thermostat
will allow humidification if the last call was for
heat.
Cool includes Cool and Auto. If the system is in
Auto mode, the thermostat will allow humidifica-
tion if the last call was for cool.
A discharge sensor is required to humidify in
the Cool mode. The thermostat prevents con-
densation in the duct work by not allowing the
humidifier to run when the discharge tempera-
ture goes below the dew point temperature. The
humidifier is allowed to run again after the dis-
charge temperature rises above the dew point
temperature.
Fig. 212.
6. Select from one of the Humidification Control Options
(ISU 8070). See Fig. 213.
• Humidify Only when Heat is On
The thermostat turns on the humidifier only if the heat
is currently running and humidification is needed.
• Humidify Only when Fan is On
The thermostat turns on the humidifier only if the fan
is currently running and humidification is needed.
• Humidify on Demand: Thermostat Controls Fan
The thermostat turns on the humidifier and the fan
when humidification is needed.
• Humidify on Demand: Humidifier Controls Fan
The thermostat turns on the humidifier when
humidification is needed and the humidifier controls
the fan.
Fig. 213.