Aube Technologies TH144 User Manual

TH144

Installation and User Guide

Electronic Thermostat for a Heat Pump

TURN OFF POWER TO THE SYSTEM AT THE MAIN POWER PANEL TO AVOID ELECTRICAL SHOCK

Installation should be carried out by an electrician or a qualified technician.

Installation

1.2 Prepare and Connect the Thermostat

1.1 Find a Location for the Thermostat

• For a new installation, choose a location about 5 ft. (1.5 m) above the floor and on an inside wall.

• Avoid locations where there are air drafts (top of staircase, air outlet), dead air spots (behind a door), direct sunlight, concealed chimneys or pipes, or air diffusers.

TABLE 1: Wiring Terminals

OUTPUT CONFIGURATIO N (MODEL)

Ter m i n a l s

R C W

Y Y1 Y2

O/B

Fault REM Unoccupied input (optional) - see 1.3 CT240/CT241/timer

Vcc (1)

Tx/Rx (2)

Gnd (3)

a. For 2H1C & 3H2C models, the AC144-02 is required to use the balance point option (compressor cut-off).

1H1C

Geothermal

2H1C

D D D D

DDDD

D D

D D D D

DDDD D D D D

AC144-02 Remote Indoor and Outdoor

Temperature Interface - see 1.4

2H2C

Geothermal

D D DD

Loosen the captive screw holding the base to the module.

3H2C

Gently lift the lower part of the module to remove it from the base.

Connect to...

Supply 24 VAC

Auxiliary heat relay

Compressor relay

First compressor relay

Second compressor relay

Reversing valve

Heat pump fault output

AC144-02

Common

Fan relay

Secure the base using the wall anchors & screws. Wire the thermostat.

FIGURE 1: Typical Wiring Dia gram (model shown TH144-3H2C)

TH144 400-144-003-C 2008-02-08 1/6

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).

24 VAC

TIMER

24 VAC

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: If you wish to use the balance point cut-off functi on to cut the

heat pump compressor when the outdoor temperature drops below the defined cut-off setpoint (see section 4.4 to de fine this setpoint), you must connect a remote temperature interface.

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.

On some models (2H1C & 3H2C), the outdoor temperature is used for the compressor cut-off point.

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 temperature if you are holding the thermostat.

Non-programmable models

Programmable models

For the programmable models, open the thermostat’s door, and set the time (

NOTE: To protect the compressor, TH144 has an On/Off delay of 2

Hour and Minute) and day (Day).

or 4 minutes (default is 2 minutes) before starting or stopping the system (see the 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 min-

utes while the internal battery is being charged before configuring TH144.

Name DESCRIPTION UP DOWN

Select the display format. When you

Display

Cycle

Aux

Keys

Protect

Stages

Val v e

change the display format, the set-

°C/24h °F/12h

points revert to their default values. 20 minutes = heavy commercial

applications 15 minutes = residential & light commercial applications

NOTE: On models not equipped with

20 min.

15 min.

the Protect switch, the On/Off delay is set based on the cycle. That is, the On/Off delay is 4 minutes for the 20 minute-cycle and is 2 minutes for the 15 minute-cycle.

W = the compressor turns Off during auxiliary heating. W + Y = the compressor remains On

W+Y during auxiliary heating. Lock the keypad. The icon is dis-

played when any button is pressed to indicate that the setpoint or operating mode cannot be modified. On the pro-

Lock

Unlock

grammable models, the schedule cannot be modified as well.

To protect the compressor against too frequent On/Off, TH144 provides an

4 min.

2 min.

On/Off delay selectable via this switch. Select between 2H2C and 1H1C. 1H1C 2H2C Select the polarity of the reversing

valve. B= the valve is energized during heating. O= the valve is energized dur-

ing cooling.

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