Honeywell TH8320U User Manual

® U.S. Registered Trademark
Copyright © 2004 Honeywell International Inc. • • All Rights Reserved
INSTALLATION INSTRUCTIONS
69-1706
TH8320U and TH8321U Touch Screen
Programmable Thermostats
APPLICATION
The TH8320U and TH8321U Touch Screen Universal Programmable Thermostats provide electronic control of 24 Vac
heating and cooling systems or 750 mV heating system. See Table 1 for a general description.
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash. Dispose of properly.
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of the old control.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
the instructions can damage the product or cause
a hazardous condition.
2. Check the ratings given in the instructions to make
sure the product is suitable for your application.
3. Installer must be a trained, experienced service
technician.
4. After completing installation, use these instructions
to check out the product operation.
Selecting Location
Install the thermostat about 5 ft. (1.5m) above the floor in
an area with good air circulation at average temperature.
See Fig. 1.
Fig. 1. Selecting thermostat location.
Table 1. TH832 Thermostats Description.
Model
Power
Method Changeover System Selection Fan Selection Comments
TH8320U Batteries or
common wire
Automatic or
manual
selectable
Heat-Off-Cool-
Auto (Em. Heat for
heat pumps)
On-Auto-Circ System and Fan selection
vary based on system type
TH8321U System and Fan selection
vary based on System type.
Humidity sensor to control
dehumidification.
5 FEET
[1.5 METERS]
YES
NO
NO
NO
M19925

Honeywell TH8320U Specifications

General

Model	TH8320U
Display	Touchscreen
Power Method	Hardwired
Programmability	7-Day Programmable
Compatibility	Conventional and Heat Pump systems
Humidity Control	No
Wi-Fi Capable	No
Stages	3 Heat/2 Cool
Power Source	24 VAC
Battery Type	AA

Summary

APPLICATION

MERCURY NOTICE

Warning about mercury disposal and recycling instructions.

Selecting Location

Instructions on choosing an optimal location for thermostat installation.

INSTALLATION

Installing Wallplate

Steps and precautions for mounting the thermostat wallplate correctly.

WIRING

Instructions for wiring the thermostat according to system type and terminal identification.

Powering the Thermostat

Explains the two methods to power the thermostat: batteries or 24 Vac common wire.

Mounting the Thermostat

Instructions for physically attaching the thermostat to the wallplate.

Adjusting Real-Time Clock

Setting Calendar and Time

Guide to setting the current date and time on the thermostat.

Using the Thermostat

How to interact with the touch screen interface and use its basic functions.

OPERATION

System and Fan Settings

Default system (Heat) and fan (Auto) settings and how they can be configured.

LED Indication

Explains the function of the LED indicator and its relation to system status.

Preprogrammed Settings

Overview of the default program settings for different periods like Wake, Leave, Return, Sleep.

INSTALLER SETUP

Installer Setup Menus

Introduces the different menus available for thermostat configuration.

Entering Installer Setup

Step-by-step guide to access the installer setup mode on the thermostat.

Changing Installer Setup Selections

How to navigate and change settings within the Installer Setup menus.

Exiting Installer Setup

Procedure to exit the installer setup screen and return to the home screen.

SYSTEM CHECKOUT

Installer System Test

Guide to using the installer system test mode to verify HVAC equipment operation.

ADVANCED FEATURES

Outdoor or Indoor Temperature Sensor

Instructions for using outdoor or indoor sensors for temperature readings.

Special Heat Pump Features

Details on heat pump operation with fossil fuel or electric auxiliary heat.

Dehumidification Droop Control

Explanation of how the thermostat controls dehumidification.

TROUBLESHOOTING