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The heating system selector and the F°/C° selector switches are located on the Printed Circuit
Board.
■ Heating system selector
The heating system selector is a switch on the Printed Circuit Board on the inside of the
thermostat. The switch is at “HG” position. Leave it in this position if you have a gas
furnace or an oil burner.
If you have an electric furnace, test to see whether the heat and fan come on as expected.
Leave the switch in the “HG” position. If the fan does not come on when the thermostat
calls for heat, change the switch position to “HE.”
The system selector has no effect in the cooling mode.
NOTE: “HG” position is for gas and most other systems. “HE” position is for certain
electric systems having a fan relay.
■ F°/C° selector (Fahrenheit/Centigrade)
Your thermostat is set for F° mode from the factory. In order to
change to C° mode, slide the switch to C° and press reset button
on the front of the thermostat with a paper clip. The reset button
is located near the display.
NOTE: Unless reset button is pressed, the thermostat will
not change the mode.
14-15
Installation
Selector Switches
Connect Wires and Mount Thermostat Cover to Wall Plate
■ Match and connect the labeled wires to the appropriate coded terminal screws on the
mounting plate. (See Figure 3, 4.) Ignore any wires which may be present, but which were
not connected to the old thermostat.
HE
HG
C F