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
103 68-0311—07
If Window Protection is turned Off, the thermostat controls
the humidity level to the user's desired humidity setting.
Frost or condensation may appear on windows.
Set up Humidification
1. Select the Humidifier Type at ISU 8000. See Fig. 211.
NOTE: Based on the humidifier type you select, the
thermostat defaults to the most commonly
used settings for that humidifier type.
For example, a Bypass or Fan Powered
humidifier will default ISU 8070 to “Humid-
ify Only when Fan is On.”
A Steam humidifier will default ISU 8070 to
“Humidify on Demand: Thermostat Controls
Fan.”
Fig. 211.
2. If optional remote wireless indoor sensors are
installed, you can choose which sensor you want to
use for humidification control. You can use a differ-
ent sensor for dehumidification. See “Wireless
Indoor Sensor” beginning on page 132 for more
information.
Fig. 212.
3. Select the terminals wired to the humidifier. See Fig.
213.
NOTE: U1, U2, and U3 are Normally Open Dry Con-
tacts that require power from the system
transformer or a separate transformer. See
“Wiring IAQ Equipment or a Heat/Cool
Stage to the Universal Terminals” beginning
on page 152.
Fig. 213.
4. Set Window Protection settings. See Fig. 214.
NOTE: Outdoor sensor is required for Window Pro-
tection.
Fig. 214.
5. Select the system mode(s) to allow humidification.
See Fig. 215.
NOTE: Heat includes Heat, Emergency Heat and
Auto. If the system is in Auto mode, the ther-
mostat 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
humidification if the last call was for cool.
A discharge sensor is required to humidify
in the Cool mode. The thermostat prevents
condensation in the duct work by not allow-
ing the humidifier to run when the dis-
charge temperature goes below the dew
point temperature. The humidifier is
allowed to run again after the discharge
temperature rises above the dew point tem-
perature.