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TH147-P and TH148LE-P 400-147-000-D 18/4/06 3/5
2.6 Installing the Batteries
n Gently pull out the battery cover.
o Install the batteries as shown. Observe the polarity.
p Reinstall the battery cover. You will hear a clicking sound.
After the batteries are installed, the thermostat performs a
sequence of tests for approximately 5 seconds.
Afterwards, the thermostat displays the measured temperature. It is
normal that the displayed temperature be higher than the ambient
temperature if you hold the thermostat in your hands. Once installed
on the wall, the thermostat will display the ambient temperature. By
default, the setpoint is 21°C (70°F) and the operating mode is set on
manual.
The time and day settings flash to indicate that they must be set
(see section 5.1).
2.7 Completing the Installation
n Once the baseplate and the batteries are installed, mount the
thermostat on the baseplate.
o Secure the thermostat using the locking screw and install the
faceplate.
p Apply power back to the system.
3.1 System Operating Mode
Use this selector switch to set the system to heating
mode (HEAT), cooling mode (COOL), or Off.
Note: When you place the thermostat in cooling mode,
you might need to wait up to five minutes before cooling can start.
This delay is a safety feature for the compressor. will flash on the
screen until cooling can start again.
3.2 Fan Operating Mode
Use the selector switch to set the fan to automatic
mode (AUTO) or continuous mode (ON).
Note: This switch is not used in a 2-wire installation as
the fan is not connected to the thermostat.
3.3 Viewing and Setting the Temperature
The ambient temperature is normally displayed. To view the set-
point, press once on one of the buttons. The setpoint is dis-
played for 5 seconds and is indicated by the symbol on the
display. During the setpoint display, press one of the buttons to
change it.
3.4 Backlight
The display illuminates for 12 seconds when the backlight button or
either of the buttons is pressed.
3.5 Thermostat Control Mode
3.5.1 Manual
The setpoint must be set manually. To place the thermostat in this
mode, press [ Mode ]. The house icon will disappear.
3.5.2 Automatic
The setpoint varies according to the programmed schedule. To
place the thermostat in this mode, press [ Mode ]. The current
period settings will be displayed. The four possible periods are:
To see the default schedule settings, see section 5.3.
3.5.3 Unoccupied (TH148LE-P only)
To place the thermostat in unoccupied mode, see section 2.4. In this
mode, the icon is displayed and only the buttons work to
allow a temporary bypass.
3.6 Temporary Bypass
3.6.1 Automatic Mode
If you modify the setpoint (using the buttons) when the thermo-
stat is in automatic mode, the thermostat temporarily bypasses the
current program. The new setpoint will be maintained for 2 hours,
then the thermostat will return to the program currently running in
automatic mode. The house icon flashes during the bypass.
3.6.2 Unoccupied Mode (TH148LE-P only)
If you modify the setpoint (using the buttons) when the thermo-
stat is in unoccupied mode, the thermostat temporarily bypasses
the setpoint of the unoccupied mode. The new setpoint will be main-
tained for 2 hours, then the thermostat will return to the setpoint of
the unoccupied mode. The icon flashes during the bypass.
3.7 Filter Indicator
After 500 hours of operation, an icon appears to indi-
cate that the filter needs replacement. Once the filter
is replaced, press [ Filter ] for 3 seconds to remove
the icon and reset the counter.
3.8 Battery Indicator
An icon appears when the batteries need replacement.
This icon will flash for 120 days, then the thermostat
will cut power to the heating/cooling unit. The icon dis-
appears once the batteries are replaced and the ther-
mostat reinstalled on its base.
Warning: Before removing the batteries, place the
system switch on the thermostat to Off. Otherwise, the
heating/cooling unit might still be running even after
the batteries are removed.
3. Basic Functions
AUTO The fan operates only when heating or cooling is activated.
ON The fan operates continuously.
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