INSTALLATION INSTRUCTIONS
TB8220U
Commercial VisionPRO™
Programmable Thermostat
APPLICATION
The TB8220U Programmable Thermostat provides electronic control of 24 Vac heating and cooling systems.
See Table 1 for a description.
Table 1. TB8220U Thermostat Description.
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 an old control.
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a
hazardous condition.
2. Check ratings given in instructions and on the
product to ensure the product is suitable for your
application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
Electrical Shock or Equipment Damage
Hazard.
Can shock individuals or short equipment
circuitry.
Disconnect power supply before installation.
Select Thermostat Location
Select a location for the thermostat about 5 ft (1.5m)
above the floor in an area with good air circulation at
average temperature. See Fig. 1.
Feature Description
Powering Methods • Battery only
• Direct connection to a 24 Vac transformer only
• Direct connection to a 24 Vac transformer with battery backup
System Types • Conventional (up to 2 Heat, 2 Cool stages)
• Heat Pump (up to 3 Heat, 2 Cool stages)
Changeover Manual or automatic changeover (selectable)
System Setting Heat-Off-Cool-Auto
Fan Setting Auto-On
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