3. Select Temperature Display Adjustment 3 LO to 3 HI –
Allows you to adjust the room temperature display up to 3°
higher or lower. Your thermostat was accurately calibrated at
the factory but you have the option to change the display
temperature to match your previous thermostat. The current
or adjusted room temperature will be displayed on the left side
of the display.
CHECK THERMOSTAT OPERATION
CONTINUED FROM FOURTH PAGE
EMER is displayed flashing when the system switch is in
Alternately displays current time and temperature.
display backlight improves display contrast in low lighting
conditions. Selecting backlight ON will keep the light on
The word HOLD is displayed when the thermostat is in the
continuously. Selecting Backlight OFF will keep the light off.
when SYSTEM switch is in the OFF position).
Now that you are familiar with the thermostat buttons and display,
read the following information to learn about the many features of
“BATT” is displayed when 2 “AAA” batteries are low and
should be replaced.
and cooling programs at the same time. There is no need to
reprogram the thermostat at the beginning of each season.
The configuration menu allows you to set certain thermostat
operating characteristics to your system or personal requirements.
Press RUN to make sure the thermostat is in the run program
mode, then press PRGM and RUN at the same time to enter the
configuration menu. The display will show the first item in the
display shows the temperature you want. The thermostat will
override current programming and keep the room tempera-
begins. Then the thermostat will automatically revert to the
The configuration menu chart summarizes the configuration
options. An explanation of each option follows.
Press HOLD to change to the next menu item or press TIME to go
backwards to the previous item in the menu. To exit the menu and
return to the program operation, press RUN. If no keys are
pressed within fifteen minutes, the thermostat will revert to
• 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
temperature by pressing
. The thermostat will
hold the room temperature at the selected setting until you
press the RUN button to start program operation again.
1. In the run mode, if the setpoint temperature is manually raised
by 3°F (2°C) or more above the actual temperature with the
TEMPERATURE UP key, and the fast second stage feature is
enabled, FA on, the second stage will energize immediately.
With FA off, second stage will not energize until the setpoint
than ten minutes.
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
2. Select Compressor Lockout CL OFF or ON – Selecting CL
ON will cause the thermostat to wait 5 minutes before turning
on the compressor if the heating and cooling system loses
power. It will also wait 5 minutes minimum between cooling
and heating cycles. This is intended to help protect the
compressor from short cycling. Some newer compressors
already have a time delay built in and do not require this
feature. Your compressor manufacturer can tell you if the
lockout feature is already present in their system. When the
thermostat compressor time delay occurs it will flash the
Snowflake and Flame icons for about five minutes.
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. Cooling allows more time per
degree because it takes longer to reach 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.
Displayed (Factory Default) Press
Select Fast (on) or slow (off) Second Stage Heat
Select Compressor lockout OFF or ON
3 LO TO
Select temperature display adjustment higher or lower
Select display backlight OFF or ON
Returns to normal operation
* Not available on earlier models
** Press HOLD to advance to next item or TIME to move backwards to previous item