TH8320U and TH8321U Touch Screen
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.
Power
Model
Method
TH8320U
Batteries or
common wire
TH8321U
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.
® U.S. Registered Trademark
Copyright © 2004 Honeywell International Inc. •
Programmable Thermostats
Table 1. TH832 Thermostats Description.
Changeover
System Selection
Automatic or
Heat-Off-Cool-
manual
Auto (Em. Heat for
selectable
heat pumps)
• All Rights Reserved
INSTALLATION INSTRUCTIONS
Fan Selection
On-Auto-Circ
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.
NO
NO
Fig. 1. Selecting thermostat location.
Comments
System and Fan selection
vary based on system type
System and Fan selection
vary based on System type.
Humidity sensor to control
dehumidification.
NO
YES
5 FEET
[1.5 METERS]
M19925
69-1706
Need help?
Do you have a question about the TH8320U and is the answer not in the manual?
Questions and answers
Hello, my thermostat says "WAIT" when I turn on the A/C. Never goes away, A/C never comes on.
When the Honeywell TH8320U thermostat displays "WAIT" and the A/C does not turn on, it means the thermostat's minimum off-time is activated. This feature delays system reactivation for up to five minutes to protect the compressor. Wait up to five minutes for the system to respond.
This answer is automatically generated
This morning the screen is blank. I cannot get anything on it...does it need new batteried or something?
The Honeywell TH8320U thermostat may not necessarily need new batteries if the screen is blank. First, check the circuit breaker and reset if necessary, ensure the power switch at the heating and cooling system is on, and verify that the furnace door is securely closed. If the thermostat is battery-powered, install fresh AAA alkaline batteries correctly.
This answer is automatically generated
What are the blue and brown wires for typically and where do the connect on a TH8320U?
My Honeywell TH320U1016 is showing an inside temperature that is 2 degrees C higher than the actual temperature at the thermostat location. Can it be calibrated?
What does the message "communications lost" mean