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CHECK THERMOSTAT OPERATION

CONTINUED FROM THIRD PAGE

Before you begin using your thermostat, you should be familiar

with its features and with the display and the location and operation

of the thermostat buttons. Your thermostat consists of two parts:

the thermostat cover and the base. To remove the cover, gently

pull it straight out from the base. To replace the cover, line up the

cover with the base and press gently until the cover snaps onto the

base.

The Thermostat Buttons and Switches

(Up arrow) Raises temperature setting.

(Down arrow) Lowers temperature setting.

FAN switch (ON, AUTO).

SYSTEM switch (COOL, OFF, HEAT).

The Display

is displayed when the SYSTEM switch is in the HEAT

position.

is displayed (non-ﬂashing) when the SYSTEM

switch is in the COOL position.

is displayed (ﬂashing)

when the compressor is in lockout mode.

Displays current temperature.

is displayed when the 2 “AAA” batteries are low

and should be replaced. Nothing else will be displayed. Earlier

models display “LO BATTERY”. Refer to 37-7006.

Displays currently set temperature (this is blank when

SYSTEM switch is in the OFF position).

Operating Features

Now that you are familiar with the thermostat buttons and display,

read the following information to learn about the many features of

the thermostat.

• SIMULTANEOUS HEATING/COOLING SETPOINT STORAGE

— You can enter both your heating and cooling setpoints at the

same time. There is no need to re-enter the thermostat at the

beginning of each season.

• TEMPERATURE SETTING — Press

or until the

display shows the temperature you want. The thermostat will

keep the room temperature at the selected temperature.

• °F/°C CONVERTIBILITY — The factory default setting is

Fahrenheit. Clipping W904 jumper on the circuit board (see ﬁg.

1) will alter this feature to Celsius temperature setting.

• LOW BATTERY INDICATOR — If the 2 “AAA” alkaline

batteries are low and should be replaced, the display will be

blank except for

. When the batteries are low,

pressing any button will cause the display to operate for ten

seconds. After ten seconds, the display will be blank except

for . After has been displayed for

4 weeks, the thermostat will raise the temperature 10° above

your setpoint in COOL mode and drop the temperature 10°

below your setpoint in HEAT mode. You cannot program with

low batteries, but you can override setpoint temperature.

• TEMPERATURE DISPLAY ADJUSTMENT — Your new

thermostat has been accurately set in our factory. However,

if you wish, you may adjust your new thermostat temperature

display to match your old thermostat. This can be accomplished

(within a ±3° range) as follows:

1. Press

or at the same time for two seconds with

the SYSTEM switch in OFF position.

2. Press

or to adjust the displayed temperature to

your desired setting.

3. Move SYSTEM switch from OFF to exit the feature.

• DISPLAY BACKLIGHT — (Not available on earlier models.)

The display backlight improves display contrast in low lighting

conditions. Selecting backlight ON will turn the light on for

a short period of time after any button is pressed. Selecting

backlight OFF (default) will keep the light off. Turn the display

backlight feature ON as follows:

1. Press

and at the same time for two seconds

with the SYSTEM switch in HEAT position. The display will

alternately show “-L” AND “FF” (off).

2. Press or to change “FF” to “ON”.

3. Move SYSTEM switch to OFF to exit the feature.

FA NSYSTEM

OFFON AUTO COOL HEAT

Figure 8. Thermostat display, buttons, and switches

1 2 3 4 5 6 7 8 9 10 11 12

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Emerson 1F78 Especificaciones Pagina 4

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