cont.
6
PROGRAMMING
5
5.3
Setting Temperature Differential and Residual
Cooling Fan Feature
Setting First Stage Differential
NOTE: The first and second stage differential settings are the same for both the
heating and cooling systems.
NOTE: If you do not desire to change the second stage differential "d2" setting you can
wait 15 seconds and the thermostat will automatically return to the normal operating
mode. Otherwise, you can press RESUME button twice to skip the second stage
differential setting and proceed to the residual cooling fan feature setting and refer to step
6 below. Pressing the RESUME button three times will skip the second stage differential
setting and residual cooling fan feature setting and automatically return you to normal
operating mode.
The default settings for the first and second stage differentials and residual cooling fan delay
settings are compatible with most systems and applications. This is normally set at time of
installation and usually does not require any modification under normal operating conditions.
If you feel that the first or second stage of your system is turning on too often, or you wish to
change the fan delay settings, simply follow the instructions below.
5.3.1
Setting Second Stage Differential
5.3.2
The default setting is 1˚ F (0.5˚ C). The room temperature must change 1˚ F (0.5˚ C) from the
setpoint temperature before the thermostat will initiate the system in heating or cooling.
1.
In normal operating mode, press & hold RESUME button for 4 seconds. LCD display will show
"d1 x˚", where "x" equals the ˚F / ˚C differential setting. This is the current first stage
differential setting.
The default setting is 2˚ F (1.0˚ C). This means that the room temperature must change 2˚ F (1.0˚ C)
in addition to the first stage differential setting before the thermostat will initiate the system in
heating or cooling.
2.
Press the or buttons to set the first stage differential to your desired setting of 1˚, 2˚,
or 3˚ F (0.5˚, 1.0˚, or 1.5˚ C).
4.
Press the or buttons to set the second stage differential to your desired setting of 2˚, 3˚, 4˚,
5˚, or 6˚ F (1.0˚, 1.5˚, 2.0˚, 2.5˚, or 3.0˚ C).
3.
Press RESUME button again and the LCD display will show "d2 x˚", where "x" equals the ˚F / ˚C
differential setting. This is the current second stage differential setting.
7
PROGRAMMING cont.
5
NOTE: To erase all entered programs, current time of day, day of week and other user
settings, gently press RESET button using a paper clip or a small pencil tip. This will
return all Thermostat settings to their default values. Remember, this will erase all
programs entered by the user.
The default setting is 60 seconds. During the COOL mode of normal operation the fan will stay
on for 60 seconds after the cooling system has satisfied the setpoint temperature and has turned
off the compressor. This allows the system to provide higher efficiency during cooling operation.
Setting Residual Cooling Fan Feature
5.3.3
6.
Press the or buttons to set the residual cooling fan delay to
your desired setting of 0 (disabled), 30, 60, or 90 seconds.
7.
Press RESUME button again to return to normal operating mode or
wait 15 seconds and the thermostat will automatically return to
normal operating mode.
5.
Press RESUME button again and the LCD display will show "FAN xx", where "xx"
equals the fan delay time in seconds during the cooling mode of operation.
5.4
Setting Your Energy Saving Programs
Tips Before Starting
5.4.1
• It is important for you to set the current time of day (note AM/PM indicator in display), and the current day of
week correctly to avoid problems with program execution. This must be done prior to entering any program
settings.
• Both the heating and cooling programs use the same setpoint times, but allow different setpoint
temperatures.
• This thermostat is pre-programmed with setpoint times and temperatures recommended by the U.S.
Environmental Protection Agency & the U.S. Department of Energy in their Energy Star program. These settings
provide efficient energy savings during normal heating and cooling modes of operation. Review these time and
temperature settings prior to establishing your personal program settings to maximize your savings, & minimize
programming requirements.
• Make sure you place the system switch in the HEAT or COOL modes of operation as appropriate. The
thermostat will not allow you to enter a program in the OFF position. The OFF mode will be considered the same
as the HEAT mode of opera tion for programming purposes. We do not recommend programming in the OFF
mode.
• When you place the system switch in the COOL, OFF or HEAT, modes of operation, the appropriate indicator
will also appear in the LCD display when the system is running.
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