Emerson 750 Thermostat Buttons and Switches, Display, Operating Features, From Third

5 CHECK THERMOSTAT OPERATION

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Before you begin programming 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

1(Up arrow) Raises temperature setting.

2(Down arrow) Lowers temperature setting.

3 TIME button.

4PRGM (program) button.

5RUN (program) button.

6HOLD button.

7FAN switch (ON, AUTO).

8SYSTEM switch (COOL, OFF, HEAT).

The Display

9 Indicates day of the week.

10 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.

11Alternately displays current time and temperature.

12“LO BATTERY” is displayed when the 2 “AAA” batteries are low and should be replaced. Nothing else will be displayed.

13Displays currently programmed set temperature (this is blank when SYSTEM switch is in the OFF position).

14“HOLD” is displayed when the thermostat is in the HOLD mode.

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 PROGRAM STOR- AGE — When programming, you can enter both your heating and cooling programs at the same time. There is no need to reprogram the thermostat at the beginning of each season.

•TEMPERATURE OVERRIDE — Press or until the display shows the temperature you want. The thermostat will override current programming and keep the room tempera- ture at the selected temperature until the next program period begins. Then the thermostat will automatically revert to the program.

•HOLD TEMPERATURE — The thermostat can hold any temperature within its range for an indefinite period, without reverting to the programmed temperature. Press HOLD button. “HOLD” will be displayed. Then choose the desired

FAN SYSTEM

ON AUTO COOL OFF HEAT

Figure 8. Thermostat display, buttons, and switches

temperature by pressing or . The thermostat will hold the room temperature at the selected setting until you press the RUN button to start program operation again.

•ENERGY MANAGEMENT RECOVERY — Energy Manage- ment Recovery (EMR) causes the thermostat to start heating or cooling early to make the building temperature reach the

program setpoint at the time you specify. Heating will start 5 minutes early for every 1° of temperature required to reach

setpoint. Cooling will start approximately 15 minutes early for every 1° because it takes longer to reach temperature. Clipping W903 jumper will disable EMR.

Example: You select EMR and have your heating pro- grammed to 65° at night and 70° at 7 AM. If the building temperature is 65° the difference between 65° and 70° is 5° .

Allowing 5 minutes per degree the thermostat setpoint will change to 70° at 6:35 AM.

•° 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 batter- ies are low and should be replaced, the display will be blank except for “LO BATTERY”. When the batteries are low, pressing any button will cause the display to operate for ten seconds. After ten seconds, the display will return to blank except for “LO BATTERY”. After “LO BATTERY” has been displayed for 4 weeks, the thermostat will raise the temperature 10 degrees above your setpoint on COOL mode and will drop temperature 10 degrees below your setpoint on HEAT mode. You cannot program with low batteries, but you can override setpoint temperature.

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