41653_model43558.pmd

36

 

OPERATION

36

 

 

 

 

 

Power Switch

 

 

 

 

 

 

 

The Power switch on the front of the thermostat determines the operating mode of the thermostat.

 

 

 

You may select ON, OFF or Emergency Heat (EM). When the Power Switch is OFF, all outputs are posi-

on off em

 

tively disconnected from the system.

NOTE: Anytime you install or remove the thermostat from the wallplate, slide the Power

Switch to the OFF position to prevent the possibility of a rapid system On-Off.

NOTE: When Emergency Heat (em) is selected on a multi-stage system, the thermostat will activate both stages of heat (W1 and W2). Thus, the heat control becomes single-stage.

System Selection Key

system ■ Press to select the desired system.

■When Auto is selected, the system will change between Heat and Cool automatically. Refer to the Auto Season Changeover section on page 43.

System

System

NOTE: The default system selection at power-on or after a reset is HEAT. Therefore it is recommended that 2 AAA batteries be used for backup during power outages.

System

System

37

Fan Key

37

fan

■ Press to set the fan operation.

■ AUTO: the fan will turn on with the system. On a multi-stage system, the

 

 

fan is controlled by the system when the Heating system selector has

 

been set to HG.

 

ON: the fan will run continuously.

Fan

Fan

Fan

PGM Auto or ON: (Programmable Fan) The fan will select AUTO or ON, depending on the setting in the programs. Refer to the Program Option section on page 33.

NOTE: The fan must be set to “PGM” for the fan’s program settings to take effect.

Fan

System Indicator Light

When the thermostat activates your system, LED lights are turned on just below the LCD display.

 

•

2

 

1 em

 

red

green or red

yellow

 

 

System Monitor This red LCD is controlled by your system and will turn on if there is a problem with your

system. It can only work if you have a connection to the L terminal.

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