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TH144 400-144-000-C 2008-02-08 2/6
1.3 Connecting the REM input (optional)
To remotely activate the Unoccupied mode, the REM input allows
connection to an optional CT240/CT241 telephone controller, a
central timer or an alarm system.
A closed contact remotely activates the Unoccupied mode (see 4.1).
1.4 Connecting the AC144-02 RTI (optional)
The AC144-02 Remote Temperature Interface (RTI) connects to a
TH144 thermostat for remote indoor or outdoor temperature
readings.
NOTE: Refer to the AC144-02 installation instructions for details on
how to connect the RTI to the thermostat.
1.4.1 Remote Indoor Sensing
The REM icon indicates that the
temperature is controlled from a remote
location using the RTI’s housing sensor or
the connected probe(s).
Temperature averaging can be obtained
using up to 4 probes.
To return to local control, disconnect the
RTI wires at the thermostat terminals and
turn off for at least 5 seconds.
1.4.2 Remote Outdoor Sensing
The OUT icon indicates the outdoor
temperature read from the outdoor probe
connected to the RTI.
Outdoor temperature readings are for
information purposes only. This does
NOT affect the temperature control.
1.5 First Power On
When you power TH144 for the first time, it
runs a sequence of tests and resets itself,
which lasts approximately 10 seconds. The
default setpoint is 20°C (68°F).
NOTE: The displayed ambient temperature
might be higher than the real ambient temper-
ature if you are holding the thermostat.
For the programmable models, open the thermostat’s door, and set
the time (
Hour and Minute) and day (Day).
NOTE: Before you configure the TH144, make sure the thermostat
sits on the base for at least 5 minutes.
NOTE: To protect the compressor, TH144 has an On/Off delay of 2
or 4 minutes (default is 2 minutes) before starting or stopping the
system (see switch #4 in following section).
1.6 Configure the TH144
The TH144 offers many
configuration options using the DIP
switches located on the back of the
thermostat.
Default settings are inside the
shaded cells.
NOTE: After first power-up, wait at least 5 minutes while the internal
battery is being charged before configuring TH144.
TIMER
24 VAC
24 VAC
24 VAC
# DESCRIPTION UP DOWN
1
Display
1
Use this switch to select the display format.
1. If you have modified your Heat and Cool setpoints, when you switch from
°F to °C (or vice versa), the setpoints will revert to their default factory
values (see 2.2).
°C/24h °F/12h
2
Cycles
20 minutes = heavy commercial applications.
15 minutes = residential & light commercial
applications.
20 min. 15 min.
3
2
2. If your thermostat is a 3H2C model, switch # 3 can be used to configure
the thermostat as a 2H1C. However, if you have any other model, the
switch is used to lock the keypad.
Stages
Use this switch to select between 2H1C or
3H2C.
2 stages
(2H1C)
3 stages
(3H2C)
3
2
Keys (keypad lock)
To avoid undesirable changes. The icon is dis-
played when any button is pressed to indicate
that the setpoint or operating mode cannot be
modified.
Lock Unlock
4
Protect (short cycle protection)
This feature protects the equipment against
short cycling by setting a minimum ON/OFF
operating time.
This ensures that the thermostat will not start or
stop a cycle if the minimum operating time has
not been reached.
4 min. 2 min.
5
Heating
Gas/Oil = fan is OFF on a call for heat (the ple-
num thermostat starts the fan automatically).
Electric = fan is ON on a call for heat.
Gas/Oil Electric
Programmable
models
Non-program-
mable models
400-144-000-C (TH144_HVAC) ENG.fm Page 2 Friday, February 8, 2008 10:33 AM