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
89 68-0311—02
5. For Air-to-Air Heat Pumps, press the up/down arrows to
set the maximum time duration of a defrost cycle. Default
is 10 minutes. Delta T is not monitored during a defrost
cycle. Check the heat pump documentation for the
defrost cycle time.
Fig. 153.
6. When you have completed Installer Setup (see “Installer
Options” beginning on page 21), you will be asked to fin-
ish setting up Diagnostics.
Fig. 154.
7. If you press Set Up Diagnostics, you will enter the
Equipment Test. See “Run a Test for Each Stage”
beginning on page 89.
8. If you press I’ll do it later, you will be reminded to finish
setting up diagnostics the next time you exit installer
setup. You can also finish setting up diagnostics by
following the procedure in “If You Decide to Set Up
Diagnostics Later”.
After Delta T Diagnostics Setup is complete, the thermostat will
detect typical failures such as no heating or no cooling and
performance related issues that are typically caused by a dirty
air filter, blocked registers, loss of refrigerant, dirty a-coil,
frozen a-coil, cracked heat exchanger, dirty burners, etc.
If You Decide to Set Up Diagnostics Later
When you are ready to set up diagnostics, follow these steps:
1. From the Home screen, press MENU.
2. Scroll down and press Installer Options.
3. Enter the passcode and press Done (see Note).
NOTE: The passcode is the date code printed on the
back of the thermostat or press
MENU > EQUIPMENT STATUS to find the date
code.
4. Press Set Up Diagnostics.
Fig. 155.
5. Proceed to “Run a Test for Each Stage”.
Run a Test for Each Stage
Follow these steps to run a test for each stage in the HVAC
system.
1. Turn on stage 1.
Fig. 156.
2. For each stage you test, wait until Delta T begins to sta-
bilize, then turn on the next stage (if present). See Fig.
157 for an example.
Fig. 157.
3. Press Next Step after Delta T stabilizes for the last stage.
The thermostat saves the Delta T and Run Time Data for
each stage you test and is displayed on the next screen.
NOTE: The thermostat only saves test data for stages
that run 1 minute or longer.