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 26
2090 What Terminals are
Wired to Cool -
Stage 4?
None
U1
U2
U3
Default varies
based on
previous
selections
Commercial No Cool Stage 4 is only available if ISU 1010 is
Commercial.
Cool Stage 4 must be wired to a universal
terminal (U1, U2 or U3).
U1, U2 and U3 are normally open dry
contacts when configured for a stage of
Cool. U1, U2 and U3 require power from a
system transformer or a separate
transformer.
U3 is only available on the Equipment
Interface Module (EIM).
2100 What Terminals are
Wired to Heat -
Stage 3?
None
U1
U2
U3
Default varies
based on
previous
selections
Both No THX9321 Thermostat Only:
This ISU is only displayed on the THX9321
thermostat when it is wired directly to the
equipment (Equipment Interface Module is
NOT used).
Heat Stage 3 must be wired to a universal
terminal (U1 or U2).
U1 and U2 are normally open dry contacts
when configured for a stage of Heat. U1
and U2 require power from a system
transformer or a separate transformer.
2110 Fan Operation in
Heat
No Fan
Equipment Controls Fan
Thermostat Controls Fan
Thermostat
Controls Fan
Both No This ISU is only displayed when ISU 2010
Heating Equipment Type is Electric Forced
Air, Hot Water Fan Coil or Other.
The thermostat automatically defaults to
Equipment Controls Fan when ISU 2010
Heating Equipment Type is Standard
Efficiency Gas Forced Air, High Efficiency
Gas Forced Air or Oil Forced Air.
No Fan is only displayed when ISU 2010
Heating Equipment Type is Other.
2120 Backup Heat Type
None
Standard Efficiency Gas Forced Air
High Efficiency Gas Forced Air
Oil Forced Air
Electric Forced Air
Hot Water Fan Coil
Hot Water Radiant Heat
Other
None Both No This ISU is only displayed when ISU 2010
Heating Equipment Type is Hot Water
Radiant Heat, Steam, Hot Water Fan Coil,
Electric Forced Air or Other.
The list of Backup Heat Types will vary
based on the type of primary heat selected
at ISU 2010 Heating Equipment Type.
When ISU 2010 Heating Equipment Type is
Hot Water Radiant Heat, the thermostat
keeps the Hot Water Radiant Heat on when
it calls for Backup Heat.
When ISU 2010 Heating Equipment Type is
Steam, the thermostat keeps the Steam
Heat on when it calls for Backup Heat.
When ISU 2010 Heating Equipment Type is
Hot Water Fan Coil, Electric Forced Air or
Other, you can select how the backup
operates. See ISU 2150 Backup Heat
Operation.
Table 4. Installer Setup (ISU) Table. (Continued)
ISU
Number
Installer Setup
Name Settings Default
Residential,
Commercial
or Both
Requires
EIM Notes