Get Familiar With HVAC Controls

Many owners of properties generally talk about using a reverse cycle ducted AC system to control the temperature of a room. However, the majority of them are not aware of the functioning of this type of temperature. In this article, we will discuss some of the common methods of controlling temperature in air conditioning systems.

Elementary AC Controller

The thermostat is the reverse cycle AC system’s basic control system. It is calibrated with all the temperatures the air conditioning unit can provide. The thermostat reads the temperature either within the controller itself or within the return air box. The reading may not be accurate when the temperature is read within the return air box, as the actual temperature of the room may be different. In the end, the air inside the room may be cold, but the air may absorb some heat from the surroundings when it is sent to the return air box, resulting in an increase in temperature. For example, the living room’s thermostat may be set to 22º. Still, the temperature may be as high as 30º when air from inside the room is circulated and sent to the return air box. This forces the AC unit to keep on running, even though the desired temperature of 22º inside the room has already been achieved.

The air conditioner will continue running in such instances until the room temperature becomes uncomfortably cold. In it possible to solve this problem through two options. Turning up the temperature on the thermostat is the first option. Do not forget that the thermostat control knob’s calibration is just a scale. Therefore, when the thermostat displays 22º, it does not necessarily interpret to 22 degrees. Therefore, adjusting the thermostat upwards is the first option.

Installing a ducted fixed constant somewhere in the hallway is the second option. Install it in a place close to the return air grille. The constant, as the name suggests, is always running. Therefore, the chilled air can effortlessly reach the return air box, as such helping with controlling the temperature as the HVAC can switch off quickly when the preferred room temperature has been reached. For example, if the return air grille is far from your bedroom, it would pose a challenge to sample the temperature inside the room as air has to traverse all the distance from your bedroom to the return air box, and some warming up or heating may occur before the recording of the temperature of that air. Your AC unit will be switched on and off accordingly by having a ducted fixed constant, thereby helping you save a lot of money in decreased energy bills.

VAV Air Controller

Another option for controlling a ducted AC system is by using a VAV (Variable Air Volume) system. The VAV permits zone motors to control the temperature in the rooms inside the building in the reverse cycle ducted air conditioning system. Blades are usually used to achieve zoning. These blades close off air ducts leading to specific parts of the building that do not require cooling or are either not in use. For instance, if you are not using a bedroom, the blades will prevent chilled air from entering that room. The blades will allow full airflow to that room when you require the room to be cooled speedily. Please note that the mode of operation of the Variable Air Volume systems is different. They can control the percentage of the air ducts open or close instead of simply using the blades to close and open air ducts. Thanks to the constant adjustment of the blades, you can control the volume of air that flows to the room. It ultimately has an effect on the temperature in that room.

For instance, if you have set your VAV controller to 22º and if the temperature inside your room is around 30º, the flow of cooled air to that room would be unrestricted until the temperature falls to around 22º. The blades will start shutting off the air supply when this happens. However, the blades will open to permit the additional flow of air into the room to make sure that the temperature of 22º degrees is maintained as soon as the moment temperature inside the room goes over 22º. The VAV controller is the most basic as well as the most popular control system when it comes to the controlling temperature in a ducted system. You can set up the VAV controller in only a couple of rooms, such as the living room, master bedroom, study room, and so on. The VAV system is not identical to the VRV system. The latter is typically a ductless split air conditioning system with several wall units or heads connected to a single outdoor compressor unit.

Full AC Temperature Control

Temperature control is achieved through a VAV system in a fully ducted AC system. Each room contains a controller that adjusts the blades in the ducts that supply air to that room. The difference between a VAV system and a full AC temperature control system is the presence of a controller in all the rooms in the house. Therefore, it is possible to control the temperature inside each room. This helps ensure optimal home comfort.


We hope this information from Eco Edge, an HVAC company in Crown Point IN, that helped us with some of the more detailed items of this article.  Please give them a shout-out of thanks for us!