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
87 68-0311—02
UNIVERSAL INPUTS
(S1, S2, S3, S4)
S1, S2, S3, and S4 are universal inputs that can be setup to
work with a sensor or dry contact device in the Installer Setup.
Setup options and compatible sensors are listed below. See
wiring diagrams on page 96 and page 154.
Universal Input Options
Indoor Air Sensor (ISU 5000)
• C7189U1005 (10K)
• C7772A1004 (20K)
• C7772A1012 (20K)
• TR21 (20K)
• TR21-A (10K)
Outdoor Air Sensor (ISU 5000)
• C7089U1006 (10K)
Discharge/Return Air Sensors (ISU 5000)
• C7735A1000 (10k)
• C7770A1006 (20K)
• C7041 (20K)
Occupancy Sensor for Remote Setback (ISU 6000)
• WSK-24
Dry Contact Alerts (ISU 6000)
• Low Voltage Dry Contact Device
NOTE: S1, S2, S3, and S4 terminals are only available on
the Equipment Interface Module (EIM).
ALERTS AND DIAGNOSTICS
The thermostat uses alerts and diagnostics to provide greater
comfort and efficiency. Alerts and diagnostics can notify
customers when maintenance or service is needed, and
display your contact information to make it easy for them to
reach you.
Delta T Diagnostics
If discharge and return air sensors are installed, the thermostat
can track system performance over time. It measures this as
“Delta T.” The thermostat monitors Delta T and displays an
alert on the home screen when the system exceeds the limits
you set.
Delta T Diagnostics tells you if the system is performing above
or below expected standards which would normally go
unnoticed, and may cause unnecessary energy use. It can also
detect and warn about problems early, before heating or
cooling equipment fails.
The thermostat will measure and record Delta T of the system
for each stage you test. This information can be used to set the
proper Delta T fault limits of the system. When the system
operates outside those limits multiple times (see “Advanced
Options for Delta T Diagnostics” beginning on page 90), an
alert is recorded in the log. If configured to do so, the system
will then display an alert to the homeowner, along with your
contact information.
Before You Set Up Delta T
Diagnostics
Refer to the information below for tips on installation and setup
of Delta T Diagnostics.
1. Refer to Fig. 10–14 for the placement of the Discharge
and Return Air Sensors.
2. In gas or oil forced air systems, Delta T will continue to
rise for several minutes even after Delta T begins to
stabilize. Be sure the Maximum Delta T Limit is set
higher than the expected stable Delta T. See Fig. 147.
Fig. 147.
3. Delta T can be affected by indoor and outdoor conditions
for heat pumps and cooling systems. Consider the total
range of normal performance when setting the Delta T
Limits.
For example, in cooling, you might have a Delta T of 20
°F when the outdoor humidity is 50% and a Delta T of 16
°F when the outdoor humidity is 85%.
You can either set Limits further apart and monitor Delta
T during all indoor and outdoor conditions or set Limits
closer together and turn off diagnostics during certain
indoor and outdoor conditions (see “Advanced Options
for Delta T Diagnostics” beginning on page 90).
For example, you can set limits closer together and then
turn off diagnostics when outdoor temperature is above
90 degrees and outdoor humidity is above 85%.
4. Verify the filter is clean and all the registers are open
before running an equipment test.
5. Select a Run Time when Delta T begins to stabilize
during the equipment test.
6. Set Minimum and Maximum Delta T Limits based on
what you consider to be unacceptable performance from
the heating and cooling equipment.
NOTE: When the system operates below the Minimum
Limit or above the Maximum Limit multiple
times (Table 7), an alert is recorded in the log. If
configured to do so, the thermostat will display
an alert to the user, along with your contact
information.
RUN TIME
M31489
DELTA T
MINIMIUM DELTA T LIMIT
RUN TIME WHEN THERMOSTAT
COMPARES DELTA T TO THE
MINIMUM AND MAXIMUM DELTA T LIMITS
DELTA T NOT STABLE DELTA T STABLE
DELTA T BEGINS TO STABILIZE
MAXIMUM DELTA T LIMIT