Make sure you have the following items:
Turn OFF the breakers or remove the fuses to the heating and/or cooling systems at the electrical panel. In some regions, there may be a switch located near the furnace.
* A jumper connects RC and RH as most combination heat and cooling systems use a single transformer. For systems where separate transformers are used, remove the jumper in place across the RC and RH terminals.
Remove the old thermostat wiring terminals from the wall, taking care not to allow the wiring to fall inside the wall.
TIP: Wrap the wire ends around a long stick, such as a pencil to keep the wires from falling into the wall.
Remove the Mounting Plate from the back of the Optima thermostat. Use the included wall anchors and screws to attach the Mounting Plate to the wall, making sure the wires run through the center opening. Use the Trim Plate vertically or horizontally if desired.
Insert the alkaline batteries into the back of the thermostat. Make sure the polarity of the batteries is correct. After inserting the batteries, the display will flash all the segments, followed by the version number of the firmware, then display US / CA with a blinking US.
When configuring the thermostat, press the + or – button or use the slider ring to cause the desired value to blink, then press MODE to select the value. Using the table at right, select the country, then the type of system. After this configuration, the thermostat will display the Home Screen, and be ready for attachment to the Mounting Plate.
Attach the thermostat to the Mounting Plate by aligning the connector pins and the plastic retention posts and pushing the thermostat onto the Mounting Plate. Make sure the connector pins are not bent and that the thermostat is fully seated on the Mounting Plate.
Go to the electrical service panel or furnace switch and turn the HVAC system back on.
The thermostat can now be used as a basic local thermostat. To enable the enhanced features, additional settings need to be configured, such as pairing with a connected home system. See the Configuring the Thermostat section in the User’s Manual for more details.