Honeywell TH8321 User Manual

PRODUCT DATA
33-00096-04
VisionPRO® 8000 Smart
Thermostat
APPLICATION
The VisionPRO® 8000 Smart thermostat features an
effortless, 7-Day programmable touchscreen thermostat
that provides control of temperature and one of the
following: humidification, dehumidification, or ventilation.
Up to 3 Heat/2 Cool heat pump systems or up to
2 Heat/2 Cool conventional systems are supported in
residential and commercial applications.
FEATURES
• Thermostat acquires weather data through either a
wired sensor or an Internet connection
•U1 Terminals
One set of dry contacts (U1) that are configurable for
one IAQ product, such as a Humidifier, Dehumidifier or
Ventilator.
• Thermostat S1, S1
Configurable S1 Terminals can be configured for a
wired indoor, wired outdoor, or discharge air sensor.
• On-board Humidity sensor
• Customizable Service Reminders
Set up to 10 service reminders. Choose from the pre-set
options or customize your own. Reminders can be
based on date or the outdoor temperature.
• Selectable for Residential and Light Commercial
Applications
One thermostat does it all to meet the needs of Resi-
dential and Light Commercial applications. Simply
select Residential or Commercial during the installer
setup. If Commercial is selected, the thermostat will use
commercial language, meet building codes and offer
365 day holiday scheduling.

Honeywell TH8321 Specifications

General

Brand	Honeywell
Model	TH8321
Category	Thermostat
Language	English

Summary

SPECIFICATIONS

Interstage Differential Explanation

Explains temperature control based on setpoint and stage capacity.

SYSTEM INSTALLATION

Finding Thermostat Password (Date Code)

Details on locating the password for accessing installer setup.

THERMOSTAT INSTALLATION AND SETUP ACCESS

Accessing Installer Options

Steps to find the password and access installer settings.

INSTALLER SETUP ACCESS AND CHANGES

Locating Thermostat Password

Explains how to find the password for installer options.

Making Installer Setup Changes

Guides through entering password and selecting setup options.

INSTALLER SETUP PARAMETERS

Application and System Configuration

Configures thermostat application, heating system, and equipment types.

Temperature and Sensor Settings

Sets temperature scale, outdoor temp, and sensor options.

ADVANCED INSTALLER SETUP

Stage and Backup Heat Configuration

Configures staging for cooling, heating, and backup heat sources.

Fan and Heat Type Settings

Sets fan control and backup heat type for system operation.

INSTALLER SETUP - HEAT AND ECONOMIZER

Backup Heat Operation Settings

Configures how backup heat operates and its type.

Economizer Configuration

Sets up economizer fault detection and wiring for commercial use.

INSTALLER SETUP - ADVANCED CONTROLS

INSTALLER SETUP - STAGING AND CONTROL

Auto Changeover and Control Options

Sets auto changeover deadband and general control options.

INSTALLER SETUP - DIFFERENTIAL SETTINGS

Cooling Differential Adjustments

Sets differential for 2nd and 3rd stage cooling for comfort.

Heating Differential Adjustments

Sets differential for 2nd and 3rd stage heating for comfort.

INSTALLER SETUP - HEAT PUMP STAGING

Compressor Heat Differential Settings

Configures heat differential for compressor stages.

INSTALLER SETUP - HEAT PUMP TIMERS AND LOCKOUTS

INSTALLER SETUP - CYCLE RATE CONTROL

INSTALLER SETUP - HEATING CYCLE RATE

INSTALLER SETUP - SENSOR AND KEYPAD CONFIGURATION

Wired Sensor Configuration Options

Configures various wired indoor, outdoor, and discharge sensors.

INSTALLER SETUP - HUMIDIFICATION AND DEHUMIDIFICATION

INSTALLER SETUP - DEHUMIDIFICATION CONTROL

Dehumidification Terminal and Overcooling Limits

Configures dehumidification terminal type and overcooling limits.

Dehumidification Control Methods

Sets dehumidification control methods and timing.

INSTALLER SETUP - DEHUMIDIFICATION MODES

INSTALLER SETUP - VENTILATION CONFIGURATION

INSTALLER SETUP - VENTILATION PRIORITIES AND LOCKOUTS

Ventilation Priority Settings

Sets priority between lockouts and ASHRAE ventilation standards.

WI-FI NETWORK CONNECTION

Connecting to Wi-Fi Network

Step-by-step guide to connect the thermostat to a Wi-Fi network.

WI-FI CONNECTION TROUBLESHOOTING

Troubleshooting Wi-Fi Connection Issues

Addresses common issues like invalid password or no IP address.

INSTALLER TESTS

Accessing the Installer Test Function

Steps to navigate to and initiate the installer test mode.

Performing Equipment Tests

Guides on testing heating, cooling, fan, and IAQ equipment.

SYSTEM MODES AND PROGRAMMING

Adjusting Program Schedules

Guides on creating or editing programmed temperature schedules.

OVERRIDING SCHEDULES

COMMERCIAL FEATURES - EVENTS AND HOLIDAYS

COMMERCIAL SETTINGS - HOLIDAY AND OCCUPANCY MODES

DEHUMIDIFICATION - RESIDENTIAL

Dehumidification Using the Cooling System

Configures dehumidification using the AC system and overcooling limits.

DEHUMIDIFICATION AND VENTILATION SETTINGS

ADVANCED FEATURES

SYSTEM CONTROL CONFIGURATION

Staging Control and Differentials

Explains how differential settings manage stage changes for comfort.

DIFFERENTIAL AND BACKUP HEAT ADJUSTMENTS

Changing Differential Settings

Adjusts stage differentials for optimal comfort and conservation.

Backup Heat Droop Configuration

Sets droop settings to restrict backup heat usage.

MULTISTAGE CONTROL AND BACKUP HEAT TIMERS

HEAT PUMP AND BACKUP HEAT OPERATION

Electric Backup Heat Operation

Explains how backup heat works with heat pumps in different modes.

HEAT PUMP CONFIGURATION - FOSSIL FUEL AND GEOTHERMAL

Fossil Fuel Backup Heat Operation

Describes fossil fuel backup heat behavior in heat and emergency modes.

Setting Up Geothermal Radiant Heat

Guides on configuring geothermal radiant heat and related options.

INDOOR AIR QUALITY (IAQ) CONTROL

HUMIDIFICATION CONTROL

DEHUMIDIFICATION SETUP - COOLING SYSTEM

Dehumidification Equipment and Wiring

Selects dehumidification equipment and wires it to the thermostat.

DEHUMIDIFICATION SETUP - WHOLE HOUSE DEHUMIDIFIER

Dehumidifier Equipment and Wiring

Selects dehumidifier equipment and wiring terminals.

Setting Up Dehumidifier Fan Control and Lockout

Configures fan control and lockout options for dehumidifier.

DEHUMIDIFICATION AWAY MODE

DEHUMIDIFICATION CONTROL AND COMMERCIAL USE

DEHUMIDIFICATION USING COOLING SYSTEM

Dehumidification Equipment Options

Lists available dehumidification equipment options.

Setting Up Dehumidification with Cooling System

Configures dehumidification using cooling system methods.

DEHUMIDIFICATION USING A DEHUMIDIFIER

Setting Up Dehumidification With Dehumidifier

Configures a dedicated dehumidifier for humidity control.

DEHUMIDIFIER OPERATION AND AWAY MODE

VENTILATION CONTROL

Ventilation Priority and Lockouts

Configures ventilation priority and outdoor condition lockouts.

VENTILATION SETUP

VENTILATION CONFIGURATION DETAILS

Ventilation Priority Selection

Chooses priority between lockouts and ASHRAE ventilation standards.

VENTILATION SETTINGS - PRIORITY AND LOCKOUTS

CONTROL VENTILATION LEVEL

CUSTOM REMINDERS - ADVANCED SETUP

COMMERCIAL FEATURES OVERVIEW

COMMERCIAL SCHEDULING - EVENTS AND HOLIDAYS

COMMERCIAL OPERATION - RAMP RATES AND ECONOMIZER

Economizer Operation

Controls economizer for ventilation and free cooling based on conditions.

ADVANCED COMMERCIAL OPERATION - TOD AND SENSORS

WIRING DIAGRAMS AND TERMINAL DESCRIPTIONS

Thermostat Terminal Designations

Explains the function of each terminal on the thermostat.

WIRING WITH C-WIRE ADAPTER

C-Wire Adapter Wiring Diagrams

Illustrates wiring for conventional and heat pump applications using the adapter.

WIRING IAQ EQUIPMENT AND STAGES TO U1 TERMINALS

Wiring IAQ Devices to U1 Terminals

Shows how to wire humidifiers, dehumidifiers, and ventilators to U1.

Wiring Heat/Cool Stages to U1 Terminals

Illustrates wiring for additional heat/cool stages to U1 terminals.

WIRING ECONOMIZER CONTROL

Economizer Control Wiring Diagrams

Diagrams for wiring economizers with and without fault alerts.

WIRING OUTDOOR SENSOR

Wiring the C7089U1006 Outdoor Sensor

Instructions for wiring the outdoor sensor to the thermostat.

WIRING WIRED INDOOR SENSORS

Wiring Indoor Sensor Configurations

Diagrams for wiring various indoor sensor combinations for averaging.

TROUBLESHOOTING COMMON ISSUES

Common Troubleshooting Scenarios

Addresses issues like blank screen, difficult-to-read display, and system response.