White Rodgers 1F90-51 User Manual download pdf (Page 6)

PARTS OF THE THERMOSTAT

The Back of The Thermostat Body

Turn the thermostat body over. On the back are

the 3 “AA” Energizer

alkaline batteries.

The “AA” Energizer

alkaline batteries provide

power to the thermostat when the 24 VAC power

is interrupted (for example, when you remove

the thermostat from the wall for programming).

Fresh batteries will maintain the stored program

for approximately a year. If power loss is long

enough for the program to be lost, the thermo-

stat will automatically return to the factory pro-

grammed temperatures (64°F heating and 82°F

cooling) when power is restored. You must

reprogram the thermostat if this happens.

If the word BATTERY is flashing in the display

window, the batteries are low and should be

replaced with fresh “AA” Energizer

alkaline

batteries.

Use

SYSTEM

SWITCH

to turn the thermostat OFF

before removing the thermostat from the

wall to replace batteries.

CAUTION

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White Rodgers 1F90-51 User Manual Page 6