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TH147 and TH148LE 400-147-010-C 27/11/06 3/4
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.
When batteries are installed for the first time, the thermostat per-
forms a sequence of tests for about 5 seconds.
Afterwards, the thermostat displays the ambient temperature. It is
normal that the displayed temperature will be higher than the ambi-
ent temperature if you hold the thermostat in your hands. It will
return to normal shortly after the thermostat is installed on the wall.
By default, the setpoint is 21°C (70°F).
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. The icon 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 Ambient 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 Unoccupied Mode (TH148LE 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.
3.5.1 Temporary Bypass (TH148LE 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.
3.6 Low-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.
Note: The thermostat settings are not erased when
the batteries are dead or removed.
3. Basic Functions
AUTO The fan operates only when heating or cooling is activated.
ON The fan operates continuously.
400-147-010-C (TH147_TH148 NP Aube) ENG.fm Page 3 Monday, November 27, 2006 10:41 AM