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—02 112
Dehumidification Away Mode
Dehumidification Away Mode for a commercial application is
identical to Dehumidification Away Mode for a residential
application. See “Dehumidification Away Mode” on page 107
and “Set up Dehumidification Away Mode” beginning on
page 108.
Control Dehumidification Level
1. Press MENU, then scroll to select Dehumidification.
2. Press Auto to use the dehumidifier or cooling system to
maintain your desired humidity level.
3. Press Off to turn off dehumidification.
4. Move the slider bar to the humidity level you prefer, then
press DONE. The dehumidification setting range is
40–80% in 5% increments.
5. If your air conditioner is used to control humidity, the
thermostat may use the following methods to maintain
your desired humidity:
• Cool from 1° to 5° F lower than your temperature
setting.
• Run cooling for the minimum “on” time to reduce
humidity.
• Run cooling and heating at the same time to reduce
humidity without lowering the temperature.
6. Press MORE SETTINGS to review or change settings for
the dehumidifier filter timer.
NOTE: If humidification and dehumidification are setup
to operate in the same system mode (Heat, Cool,
Off) and you are sensing humidity from one loca-
tion, the thermostat will automatically enforce a
15% deadband between the humidification and
dehumidification settings. The thermostat will
automatically switch between humidification and
dehumidification to maintain the desired humidity
level.
If humidification and dehumidification are setup
to operate in the same system mode (Heat, Cool,
Off) and you are sensing humidity from two differ-
ent locations using a remote wireless indoor sen-
sor (for example, main level and crawl space), the
thermostat will allow humidification and dehumid-
ification to operate at the same time, and there is
no deadband between humidification and dehu-
midification settings.
Ventilation
The thermostat can be set for the following ventilation types:
(ISU 10000)
• ERV/HRV
• Passive (Fan Only)
• Fresh Air Damper
Ventilation Control Methods (ISU 10050)
Ventilation can be setup to meet either ASHRAE or Percent On
Time settings. To meet these settings, the thermostat will
ventilate during calls for heat, cool, and fan. If the required
ventilation has not been achieved for ASHRAE or Percent On
Time, the thermostat will force the ventilation equipment on.
• ASHRAE
The thermostat operates ventilation equipment to meet the
ASHRAE 62.2 ventilation standard based on CFM, number
of bedrooms, and square footage of the house. ASHRAE
62.2 can only be met if the ventilation equipment is running.
If the ventilation equipment is off for any reason (outdoor
ventilation lockouts, set up to turn Off during Sleep period,
turned off by user, etc.), ASHRAE 62.2 is not met during
those times. See ISU 10125 to select a Ventilation Priority.
• Percent On Time
The thermostat operates ventilation equipment based on a
percentage entered in the installer setup (ISU 10120). For
example if Percent On Time is set to 50%, the ventilation
equipment will run at random times during a 1 hour period
until it reaches a 50% run time (approximately 30 minutes).
Default setting is 30%. Range is 10% to 100% in 10%
increments.
Press MENU
Scroll to select DEHUMIDIFICATION
Set humidity to desired level
Press to review filter timer