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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
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