Aube Technologies TH146-P-DE manual Principles of Operation

NOTE: In this mode, the short-cycle protection is disabled and the interstage delay is reduced to 1 minute.

USER: User mode. Gives access to configuration parameters 1 to 4 only.

3.2 Software Configuration

nPlace the controller in Installer mode (INST) using the SW2 selector switch on the back of the console.

oPress the Mode button for 3 seconds to access the configura- tion menu (see page 4). The first menu item (parameter) is dis- played.

pTo view another menu item, briefly press the Mode button. The following table shows the order in which the parameters appear as well as a description of each parameter.

qTo modify a parameter, press either button. r To exit the configuration menu, press .

sReturn the controller to User mode (USER) using the SW2 selector switch.

4.Principles of Operation

4.1 Automatic Heating/Cooling Changeover

With automatic changeover, there’s no need to adjust the controller at every change of season or weather condition. The controller switches automatically between heating mode and cooling mode to maintain the desired temperature.

Manual Mode

When the controller is in manual mode, the heating/cooling mode changeover occurs as follows:

•The controller switches to cooling mode when the indoor tem- perature is higher than the setpoint by more than 1.5°C (2.5°F) for 15 minutes.

•The controller switches the heating mode when the indoor tem- perature is lower than the setpoint by more than 1.5°C (2.5°F) for 15 minutes.

Automatic Mode

When the controller is in automatic mode, it follows the programmed schedule. Two temperature settings (heating setpoint and cooling setpoint) are programmed for each period of the schedule. The heating/cooling mode changeover occurs as follows:

•When the controller is in heating mode, the indoor temperature is maintained at the heating setpoint. However, if the tempera- ture rises and remains above the cooling setpoint for 15 min- utes, the controller will switch to cooling mode.

•When the controller is in cooling mode, the indoor temperature is maintained at the cooling setpoint. However, if the tempera- ture drops and remains below the heating setpoint for 15 min- utes, the controller will switch to heating mode.

4.2 Balance Points

Balance points are used to disable the heat pump operation or aux- iliary heating below or above a certain temperature.

•When the outdoor temperature is below the balance point low (bP L), the heat pump is disabled and only auxiliary heating can used (see page 4, item 5).

•When the outdoor temperature is above the balance point high (bP H), the auxiliary heat is disabled (see page 4, item 6) and only the heat pump can be used.

NOTE: Balance points will not work if the AC144-03 outdoor tem- perature sensor is not connected to the controller.

4.3 Heating During Defrost

The auxiliary heat is activated during defrost except under the fol- lowing conditions:

•When the outdoor temperature is above the defrost point (see page 4, item 7). NOTE: This condition will not apply if the AC144-03 outdoor temperature sensor is not connected to the controller.

•When the plenum temperature is above 40°C (104°F). The auxiliary heat is re-activated when the plenum temperature drops below 32°C (90°F). NOTE: This condition will not apply if the AC146-410 plenum sensor is not connected to the control- ler.

NOTE: The auxiliary heat’s short-cycle protection is disabled during defrost.

4.4 Types of Heat Pump Installations

The controller can be configured for either of the following types of heat pump installations (see page 4, item 8).

•Add-on Installation: This type of installation is performed when adding a heat pump to an existing furnace. When the heat pump is installed, the furnace becomes the auxiliary heat source. In this type of installation, the indoor coils are usually installed downstream of the auxiliary heat source. When the controller is configured for an add-on installation, the heat pump is disabled during auxiliary heating to prevent overpres- sure.

•New Installation: In this type of installation, as there is not already a furnace, the auxiliary heat source is installed at the same time as the heat pump. In this type of installation, the indoor coils are located upstream of the auxiliary heat. When the controller is configured for a new installation, the heat pump and the auxiliary heat can operate simultaneously.

4.5 “Smart Fan”

When “smart fan” is enabled (see page 4, item 10), the fan operates as follows:

•During the unoccupied mode (i.e., when you are away from home), the fan operates only when heating or cooling is acti- vated.

•The fan operates continuously the rest of the time.

NOTE: “Smart fan” is useful only when the fan is set to On (see sec- tion 5.3).

4.6 Interstage Delay

The interstage delay is the time that the temperature has to return to an acceptable value when it deviates too much from the setpoint. After this delay, auxiliary heating is activated. Auxiliary heating will be deactivated once the temperature returns to an acceptable value (see page 4, item 11).

TH146-P-DE 400-280-004-C 11/29/06 3/9