TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT
62-0223—1 8
POWER THE THERMOSTAT
You can choose from three methods to power the
thermostat:
• Batteries only (AA alkaline).
• 24 Vac direct connection only.
• 24 Vac direct connection with battery backup (AA
alkaline).
Wiring 24 Vac Common
• Single-Transformer System—Connect the common
side of the transformer to the C screw terminal of the
thermostat wallplate. Leave the metal jumper wire in
place between RC and R.
• Two-Transformer System—Connect the common side
of the cooling transformer to the C screw terminal of
the thermostat wallplate. Remove the metal jumper
wire between RC and R.
Installing Batteries
1. Install two AA alkaline batteries on the back of the
thermostat as marked. See Fig. 21.
Fig. 21. Installing batteries.
2. Locate and remove the tab labeled Remove. See
Fig. 22.
IMPORTANT
This tab must be removed in order to set the
real-time clock.
Fig. 22. Remove tab labeled REMOVE from thermostat
back.
Mount Thermostat to Wallplate
1. Align the terminal screw blocks with the pins on the
back of the thermostat.
2. Push the thermostat straight onto the wallplate until
it snaps into place. See Fig. 23.
Fig. 23. Mount thermostat to wallplate.
M22259
BACK OF THERMOSTAT
BATTERY HOLDER
BATTERIES (2)
REMOVE
TAB
REMOVE DURING
INSTALLATION
M22260
REMOVE DURING
INSTALLATION
WALL
M23024
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