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—02 142
THX9321 Thermostat Wiring Diagrams
Using Universal Relays to Control Heating or Cooling
The THX9321 Thermostat and the EIM have universal outputs that can be configured for the following stages of heating and
cooling, based on the terminals available.
THX9321 THERMOSTAT (U1 AND U2)
• Cool Stage 3 (ISU 2080 - commercial only)
• Cool Stage 4 (ISU 2090 - commercial only)
• Conventional Heat Stage 3 (ISU 2100, 2140)
• Backup Heat Stage 2 for Heat Pumps (ISU 2170)
• Geothermal Radiant Heat (see wiring diagrams on
page 140, page 141, and page 144)
FOR THX9421 WITH EIM (U1, U2, AND U3)
• Cool Stage 3 (ISU 2080 - commercial only)
• Cool Stage 4 (ISU 2090 - commercial only)
• Geothermal Radiant Heat (see wiring diagrams on
page 140, page 141, and page 144)
NOTE: The EIM has dedicated terminals for
Conventional Heat Stage 3 and
Backup Heat Stage 2 for Heat Pumps
Powering universal relay with system transformer (THX9321
shown).
Fig. 326. Prestige THX9321 powering universal relay with
system transformer.
Powering universal relay with separate heating transformer
(THX9321 shown).
Fig. 327. Prestige THX9321 powering universal relay with
separate heating transformer.
1 U1/U2/U3 terminals are normally open dry contacts when set up for a stage of heating or cooling.
2 You must install a field jumper if the stage of heating or cooling is powered by system transformer. Do NOT install a field jumper
if the stage of heating has its own transformer.
3 U1/U2/U3 terminals are assigned to a stage of heating or cooling in the Installer Setup.
HEAT STAGE 3 or
COOL STAGE 3 or
COOL STAGE 4
120
VAC
C
Rc
R
U1
U1
U2
U2
24
VAC
Transformer
Thermostat
C
R
1
1
2
3
M32952
A
HEAT STAGE 3
120
VAC
C
Rc
R
U1
U1
U2
U2
24
VAC
Transformer
120
VAC
24
VAC
Transformer
Thermostat
C
R
C
R
1
1
2
3
M32953