Aube Technologies CT280-3H3C 설치 매뉴얼 - 페이지 3

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4. Principles of Operation

4.1

Automatic Heating/Cooling Changeover

With automatic heating/cooling mode 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

temperature is higher than the setpoint by more than 1.5°C (2.5°F)

for 15 minutes.

• The controller switches to heating mode when the indoor

temperature 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 temperature rises

and remains above the cooling setpoint for 15 minutes, 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 temperature drops

and remains below the heating setpoint for 15 minutes, the controller

will switch to heating mode.

4.2

Balance Points (heat pumps only)

Balance Points are used to disable the heat pump or the auxiliary heating

when the outdoor temperature is below or above a set temperature.

• When the outdoor temperature is below the Balance Point Low

(bPL), the heat pump is disabled and only auxiliary heating can be

used (see page 8, item 5).

• When the outdoor temperature is above the Balance Point High

(bP H), the auxiliary heat is disabled and only the heat pump can be

used (see page 8, item 6).

NOTE: Balance Points cannot be used if the AC144-03 outdoor temperature

sensor is not connected to the controller.

4.3

Heating During Defrost (heat pumps only)

The auxiliary heat is activated during defrost except under the following

conditions:

• When the outdoor temperature is above the defrost point (see

page 8, item 7).

NOTE: This condition will not apply if the AC144-03

outdoor sensor is not connected to the controller.

• When the plenum temperature is above 40°C (104°F) for add-on

installations only. The auxiliary heat is re-activated when the plenum

temperature drops below 32°C (90°F).

apply if the AC146-410 plenum sensor is not connected to the

controller.

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 8, 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

TH146-P-U

NOTE: This condition will not

the auxiliary heat source. When the controller is configured for an

add-on installation, the heat pump is disabled during auxiliary

heating to prevent overpressure.

• 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

Interstage Delay

Interstage Delay is the time allocated for the temperature to return to an

acceptable value when it deviates too far from the setpoint. If this time has

elapsed, the next heating or cooling stage is activated. The heating or

cooling stage will be deactivated when the temperature returns to an

acceptable value. The Interstage Delay is fixed at 4 minutes if the controller

is configured for an HVAC system and is user-adjustable if it is configured for

a heat pump (see page 8, item 9).

4.6

Low and High Temperature Limits

Low Temperature Limit (LLMT) and High Temperature Limit (HLMT) are

used to keep the plenum from becoming too cold or too hot. During cooling,

if the plenum temperature is lower than LLMT, a cooling stage is deactivated

starting with the one that was last activated. If, after a while, the temperature

is still too low, another cooling stage is deactivated and so on. Likewise,

during heating, if the plenum temperature is higher than HLMT, a heating

stage is deactivated starting with the one that was last activated. If, after a

while, the temperature is still too high, another heating stage is deactivated

and so on. (see page 8, items 10 and 11.)

WARNING: LLMT and HLMT can be used in parallel with an UL353-

approved device but they do not replace such device.

NOTE: LLMT and HLMT cannot be used if the plenum temperature sensor is

not connected to the controller.

4.7

Smart Fan

When Smart Fan is enabled (see page 8, item 15), the fan operates as

follows:

• During periods 2 and 4 of automatic mode and during the

unoccupied mode (i.e., when you are sleeping or away from home),

the fan operates only when heating or cooling is activated.

• The fan operates continuously the rest of the time.

NOTE: For Smart Fan to work, set the fan to On (see user guide).

4.8

Automatic Humidification / Dehumidification Changeover

If a humidifier and a dehumidifier are both connected to the controller, the

controller will automatically switch between the two devices to maintain the

desired humidity level. The changeover occurs when the humidity deviates

from the setpoint by more than 3% for 30 minutes.

4.9

Dehumidification by Droop

Dehumidification by droop is a method of dehumidification without using a

dehumidifier. This method is possible only if your system has a cooling

stage. When this feature is enabled (see page 8, item 18), if the humidity

level is too high, the temperature is temporarily lowered below the setpoint to

reduce the indoor humidity level.

NOTE: Dehumidification by droop can cause overcooling.

4.10

Dehumidification by Air Exchanger

Dehumidification using an air exchanger will not be efficient if the outdoor

temperature is too high. When an air exchanger is used, the controller will

disable dehumidification if the outdoor temperature is NOT lower than the

indoor temperature by more than 5°C (9°F). When this occurs, the message

HIGH TEMP is displayed.

3/8