Spec Sheet
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—07 144
THX9321 Thermostat Wiring Diagrams
Typical wiring of a 3-heat / 2-cool heat pump system with
one transformer.
Fig. 327. Prestige THX9321 and heat pump system with
one transformer.
Typical wiring of a 2-heat / 2-cool conventional system
with one transformer.
Fig. 328. Prestige THX9321 and 2-heat / 2-cool
conventional system with one transformer.
Typical wiring of a 3-heat / 2-cool heat pump system with
two transformers.
Fig. 329. Prestige THX9321 and heat pump system with
two transformers.
Typical wiring for geothermal radiant heat, geothermal
forced-air and backup heat with one transformer. See
“Geothermal Radiant Heat” on page 100.
Fig. 330. Prestige THX9321 and geothermal radiant
heat, geothermal forced-air and backup heat with one
transformer.
1 U1 and U2 terminals are dry contacts.
2 L/A terminal sends continuous output when thermostat is set to EM HEAT mode except when set up for Economizer or
TOD. See “Economizer Module Wiring Diagrams” beginning on page 154.
3 U1 or U2 terminals must be used for geothermal radiant heat (ISU 2010). Thermostat allows 2 stages of radiant heat—
geothermal (stage 1) and boiler (stage 2).
4 “U” terminals are normally open dry contacts when set up for geothermal radiant heat. You must install a field jumper if
radiant heat is powered by system transformer. Do NOT install a field jumper if radiant heat has its own transformer.
5 Remove jumper if using separate transformers.
6 Connect the THP9045 Wiresaver Module to the K terminal in heating/cooling applications that do not have a common
wire at the thermostat. The K terminal cannot be used in heat-only applications. See THP9045 installation instructions
for more information.
NOTE: For setup and operation, see “Geothermal Radiant Heat” beginning on page 100.
CHANGEOVER VALVE
BACKUP HEAT
COMPRESSOR STAGE 1
COMPRESSOR STAGE 2
FAN RELAY
COMPRESSOR MONITOR
OR ZONE PANEL
120
VAC
O/B
AUX/E
Y
Y2
G
L/A
K
C
Rc
R
U1
U1
U2
U2
24
VAC
Transformer
Thermostat
C
R
1
2
6
M32948A
HEAT STAGE 1
HEAT STAGE 2
COMPRESSOR STAGE 1
COMPRESSOR STAGE 2
FAN RELAY
120
VAC
W
W2
Y
Y2
G
A
K
C
Rc
R
U1
U1
U2
U2
24
VAC
Transformer
Thermostat
C
R
1
5
6
M32949A
31
CHANGEOVER VALVE
COMPRESSOR STAGE 1
COMPRESSOR STAGE 2
FAN RELAY
COMPRESSOR MONITOR
OR ZONE PANEL
120
VAC
O/B
AUX/E
Y
Y2
G
L/A
K
C
Rc
R
U1
U1
U2
U2
24
VAC
Air Handler
Transformer
120
VAC
24
VAC
Backup Heat
Transformer
C
R
R
C
Thermostat
BACKUP HEAT
1
2
6
M32950A
CHANGEOVER VALVE
BACKUP HEAT
COMPRESSOR STAGE 1
COMPRESSOR STAGE 2
FAN RELAY
COMPRESSOR MONITOR
OR ZONE PANEL
120
VAC
O/B
AUX/E
Y
Y2
G
L/A
K
C
Rc
R
U1
U1
U2
U2
24
VAC
Transformer
Thermostat
C
R
GEOTHERMAL
RADIANT
HEAT
STAGE 1
3
2
4
6
M32951A