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—02 126
Economizer and Time of Day (TOD)
Operation
Economizer
The thermostat controls an economizer module to provide
ventilation during occupied periods and free cooling when
outdoor conditions are favorable. In some climates the cooling
system may run several hours when it may not be required to
maintain indoor comfort. When outdoor conditions are
favorable, ventilation with outdoor air can achieve the same
level of comfort at lower cost. Table 9 explains how the
Economizer Module is controlled by the thermostat.
The thermostat works with the Jade W7212 Economizer
Module for conventional systems and the Jade W7213 and
W7214 Economizer Modules for heat pump systems.
Time of Day (TOD)
The thermostat can be set up for a Time of Day output in the
installer setup. This output is commonly used to control lighting
panels, turning them on for occupied periods and off for
unoccupied periods. Table 10 explains how the TOD feature
works with various thermostat modes.
The Economizer Module and Time of Day output connect to
the A-L/A terminal at the thermostat or EIM and are set up at
ISU 2220.
Fig. 305.
Pre-Occupancy Purge
The thermostat can be set up for Pre-Occupancy Purge in the
installer setup (ISU 4010). When setup for Pre-Occupancy
Purge, the thermostat runs the fan 1 to 3 hours before each
occupied period to provide a comfortable workplace upon
arrival. Options are Off and 1 to 3 hours.
Fig. 306.
Table 9. Economizer Operation.
Thermostat Mode Equipment Operation
A-L/A terminal:
Economizer
Occupied Heat/Cool/Fan running
ON
Occupied
temporarily
Heat/Cool/Fan running
Occupied Heat/Cool/Fan NOT
running
Occupied
temporarily
Heat/Cool/Fan NOT
running
Pre-occupancy
purge
Fan running
Unoccupied Cooling system running
Unoccupied
temporarily
Cooling system running
Standby Cooling system running
Unoccupied Cooling system NOT
running
OFF
Unoccupied
temporarily
Cooling system NOT
running
Standby Cooling system NOT
running
ON
Non-programmable Fan running
Non-programmable Fan NOT running OFF
Table 10. TOD Operation.
Thermostat Mode
A-L/A terminal:
TOD
Occupied
ONOccupied temporarily
Temperature overrides
Unoccupied
OFF
Unoccupied temporarily
Standby
Non-programmable