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
115 68-0311—02
8. If Percent On Time was selected for ISU 10050, select
the Ventilation Percent on Time. See Fig. 255.
Fig. 255.
9. Select the Outdoor Condition Lockouts. See “Ventilation
— Outdoor Condition Lockouts (ISU 10130)” on
page 113 for more information.
When ISU 10125 Ventilation Priority is set to Lockouts
are Priority, or ISU 10050 Ventilation Control Methods is
set to Percent On Time, the thermostat will indicate
whether this meets or may not meet the ASHRAE 62.2
Standard or the Percent On Time setting. See Fig. 256.
When ISU 10125 Ventilation Priority is set to ASHRAE is
Priority, the screen below will indicate the maximum
length of time that ventilation can be locked out over a 21
hour time period. For example, Ventilation Lockout Will
Not Exceed 12.5 hours. The length of time that ventila-
tion is locked out is limited to ensure that the ASHRAE
62.2 Ventilation Standard is met. See Fig. 256.
Fig. 256.
10. Select whether to lockout ventilation on humidification or
dehumidification calls. This feature is used to help reach
the user's desired humidity level by not allowing the ven-
tilation equipment to run during a call for humidification
or dehumidification. The thermostat will indicate whether
this meets or may not meet the ASHRAE 62.2 Standard
or the Percent On Time setting. See Fig. 257.
NOTE: ISU 10140 “Lockout Ventilation on Humidifica-
tion or Dehumidification Calls” is not an option
when you select “ASHRAE is Priority” at ISU
10125.
Fig. 257.
11. Select whether to Ventilate on High Indoor Humidity. See
“Ventilate on High Indoor Humidity (ISU 10160)” on
page 113 for more information. See Fig. 258.
Fig. 258.
Control Ventilation Level
1. Press MENU, then scroll to select Ventilation.
2. Press Setting to set the operating mode.
• Automatic: Ventilation runs as programmed by the
installer (ASHRAE or Percent On Time).
• Off: Ventilation remains off unless turned on by the
timer or from a Vent Boost Remote.
• On: Ventilation is always on.
3. Press or to run ventilation temporarily. The Tempo-
rary Boost (timer) setting range is 0–180 in 20 minute
increments. To turn Temporary Boost off, set to zero or
press Cancel Temporary Boost.