OPERATION
The system "mode" is selected by pressing the SYSTEM button. Icons on the bottom right corner of the display will indicate the mode: COOL (
), AUTO (
), HEAT (
), EMER, or OFF. In any mode except OFF, the setpoint temperature will be shown on the right side of the display. In OFF, this area will be blank. The current temperature will be displayed on the left side of the display.
To operate properly in the AUTO mode, the heat setpoint temperature cannot be the same as or higher than the cool setpoint temperature. The heat setpoint must be at least 1° lower than the cool setpoint.
Automatic System Changeover
When the thermostat is in the AUTO mode, both the Flame and Snowflake icons are displayed. The thermostat will call for heat or cool depending on the room temperature. The setpoint temperature displayed will be that of the last mode called. If the last system cycle was heat, the HEAT setpoint will be displayed. If the room temperature raises above the HEAT setpoint and the COOL setpoint and a call for cool is required, the temperature displayed will change to be the COOL setpoint.
Second Stage Time Delay
Your thermostat is designed to determine the optimum time to activate the second stage. Simply raising the temperature in heating or lowering it in cooling will not always force the thermostat to bring the second stage on quickly. There is a time delay from 0-30 minutes depending on the performance of the first stage of the system.
EXAMPLE: For the last 2 hours the thermostat is set on 70° and the room temperature is 70° with the equipment using only the first stage of heat. Since the equipment is keeping the tempera- ture within 1° of setpoint, the thermostat will delay second stage for a longer time if you manually raise the temperature or if the room temperature quickly changes. Once the second stage comes on, it will come on sooner the next time there is a difference between the setpoint and the room temperature. The net effect of the staging program is that when the first stage is capable of making temperature the second stage will delay longer. When the thermostat calculates that first stage cannot make temperature in a reasonable time, the second stage will come on sooner. This built in function automatically optimizes the use of additional stages of heat or cool.
Manual Operation
Permanent Program Override (HOLD) – With the SYSTEM button set to HEAT or COOL, press the HOLD button once and release. “HOLD” will be displayed. Use 
or 
to adjust the temperature. The thermostat will hold the room temperature at the selected setting until you press RUN button to start program operation again.
Temperature Program Override – Press 
or 
until the display shows the temperature you want. The thermostat will override current programming and keep the room temperature at the selected temperature for a programmed time period. “HOLD” will be displayed and flashing. The thermostat will automatically revert to the program after programmed period.
•LOW BATTERY INDICATOR — If the 2 “AA” alkaline batter- ies are low and should be replaced, the display will be blank except for “LO BATT”. We recommend replacing batteries every 2 years. If the home is going to be unoccupied for an extended period (over 3 months), the batteries should be replaced before leaving. When the batteries are low, pressing any button will cause the display to operated for ten seconds. After ten seconds, the display will be blank except for “LO BATT”. You cannot program with low batteries, but you can override setpoint temperature. After “LO BATT” has been displayed for 4 weeks, the thermostat will raise the tempera- ture 10 degrees above your setpoint in COOL mode and will drop the temperature 10 degrees below your setpoint in HEAT mode. If the “LO BATT” condition continues, and when it reaches certain value, the thermostat will turn off all the loads and “LO BATT” will flash.
•SIMPLIFIED COPY DAY FUNCTION — This feature allows Monday’s program to be copied into the rest of the week’s programming. This feature is available the first time you programmed your thermostat. To use this feature, simply enter the program for Monday as described in ENTERING YOUR PROGRAM, then press RUN or HOLD. The only way to restore this feature is to complete a software reset (see Reset Operation under TROUBLESHOOTING section).
•COPY DAY FUNCTION — This feature allows a selected day’s program to be copied to the desired day’s programming. To use this feature: in PRGM mode, select the day to be copied from by pressing the HOLD button. Enter the program for the selected day as described in ENTERING YOUR PROGRAM. Press and hold the TIME button for 4 seconds to begin the COPY mode. The LCD will display “COPY” and the selected day to be copied. The day the program will copy to will be flashing. Press the HOLD button to select the day you want to copy to. Press TIME to complete the Copy Day operation and return to PRGM mode. Press RUN to exit.
PROGRAMMING YOUR THERMOSTAT
This section will help you plan your thermostat's program to meet your needs. For maximum comfort and efficiency, keep the following guidelines in mind when planning your program.
•When heating (cooling) your building, program the temper- atures to be cooler (warmer) when the building is vacant or during periods of low activity.
•During early morning hours, the need for cooling is usually minimal.
Planning Your Program
Look at the factory preprogrammed times and temperatures shown in the sample schedule. If this program will suit your needs, simply press the RUN button to begin running the factory preset program.
If you want to change the preprogrammed times and tempera- tures, follow these steps.
Determine the time periods and temperatures for your program. You can program four or two periods for each day (see Configu- ration menu, item 2). You may use the same heating and cooling temperatures for consecutive time periods. You can choose start times, heating temperatures, and cooling temperatures independently (for example, you may select 5:00 AM and 70° as
