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—02 136
* Remove factory installed jumper for two transformer systems.
†
The THP9045A1023 Wire Saver module is used on heat/cool systems when you only have four wires at the thermostat and you
would like the thermostat to be powered with a common wire. Use the K terminal in place of the Y and G terminals on conven-
tional or heat pump systems to provide control of the fan and the compressor through a single wire—the unused wire then
becomes your common wire. See THP9045 instructions for more information.
CAUTION
Electrical Hazard.
Can cause electrical shock or equipment damage.
Disconnect power before wiring.
All wiring must comply with local electrical codes and
ordinances. See Fig. 319–327.
1. Select wiring diagram that corresponds with system type
and the equipment being installed (using the EIM or wir-
ing the thermostat directly to the HVAC equipment).
2. Loosen the screws for the appropriate terminals. Insert
wires in the terminal block under the loosened screw.
See Fig. 317.
3. Securely tighten each screw.
4. Push excess wire back into the hole.
5. Plug the hole with nonflammable insulation to prevent
drafts from affecting the thermostat.
6. See Fig. 319–327 for typical wiring hookups.
Table 14. THX9321 Terminal Designation Descriptions.
Conventional System Heat Pump
Terminal Description Terminal Description
C Common wire from secondary side of cooling
transformer (if 2 transformers).
C Common wire from secondary side of cooling
transformer.
Rc* Cooling power Rc* Cooling power
R* Heating power R Heating power
W Heat Stage 1 O/B Changeover valve for heat pumps
W2 Heat Stage 2 AUX-E Backup Heat/Emergency Heat
Y Compressor Stage 1 Y Compressor Stage 1
Y2 Compressor Stage 2 Y2 Compressor Stage 2
G Fan Relay G Fan Relay
A Connect to Economizer Module or Lighting Panel
(TOD).
L/A Connect to Compressor Monitor, Zone Panel,
Economizer Module or Lighting Panel (TOD).
U1 / U1
U2 / U2
Universal relay for humidification, dehumidification,
ventilation, or a stage of heating/cooling.
U1/ U1
U2 / U2
Universal relay for humidification, dehumidification,
ventilation, or a stage of heating/cooling.
K
†
Connect to K on Wire Saver module.
K
†
Connect to K on Wire Saver module.