7. Secure the back plate to the wall with the supplied screws making certain the thermostat wires have been inserted
through the large rectangular hole in the back plate.
8. Carefully attach the thermostat wires to the appropriate connections on the terminal board on the back plate. Use the
notes taken from step 2 of "Removing The Existing Thermostat" to determine their location on the new thermostat.
Reference wiring diagrams are available in the back of this manual.
9. Carefully place the thermostat body face down on a soft surface to expose the main circuit board. Reference circuit
diagram in the back of this manual. Gently set the following switches in the correct position for the application:
• GAS / ELECTRIC (SW2): Configures the thermostat to either gas/oil or electric heating systems. For electric, set the
switch to HE. For gas, set the switch to HG.
• C / F (SW1): Sets the display in either Celsius or Fahrenheit.
• NORM / HP (SW5): Configures the thermostat for normal heating/cooling systems or heat pump systems
(single stage).
• ON/OFF (ARM): Switch should always be set to ON to avoid any system problems.
10. Attach the thermostat body to the back plate by resting the top of the thermostat body on the two clips on the upper
portion of the back plate. Then gently press the front body into place until the bottom locking tab snaps into place.
NOTE: The terminal board pins must be properly aligned with the sockets on the terminal board (on the back plate) in
order for the front body to properly snap into place.
11. Set the SYSTEM switch, located on the front face, to the OFF position.
12. Set the FAN switch, located on the front face, to the AUTO position.
INSTALLATION
5