There are three main functions of an HVAC system, heating, ventilation, and air conditioning providing acceptable indoor air quality and thermal comfort. The heating element usually refers to a furnace or boiler. The ventilation element is natural or forced and when it is forced it is more often than not used for air cleaning purposes as well. The third and final element of an HVAC system is air conditioning which is the exact opposite of heating. Removing the existing heat from the interior of the home is its main focus.

Air conditioners function by taking heat and humidity from your home and releasing it outside for eventually dropping the temperature in your home. All parts of the central cooling system must work together to complete this process. When the temperature in your home needs to be changed, central cooling kicks off. The thermostat will alert your cooling unit that the temperature needs to drop, and all parts will work simultaneously to get your space to your desired temperature.

Central heating systems can work in the same way as central cooling systems which move air around to change the temperature in your home. Central heating systems move the hot air in to get your home to your desired temperature instead of moving the hot air out. An HVAC device might actually be producing its own heat depending on what HVAC system that is. Heat pumps have the same parts as a split-system air conditioner and work in the same way. When the temperature drops and a heat pump needs to provide heat, the process essentially reverses itself. Once a heat pump registers the function shift, a reversing valve in the outdoor unit kicks on allowing the heat pump to absorb heat energy from the outside air and transfer it into the home to warm it up.

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What do you know about the Centralized Air System?  

The split system is the most common centralized cooling system. This system includes an outdoor cabinet that contains a condenser coil and a compressor. It also contains an indoor evaporator coil, which is usually installed in conjunction with your air handler.

What do you mean by a Local Comfort Cooling System?

When the entire ventilation system in a building is connected and integrated to offer heating, ventilation, and air conditioning through a single system, it is known as the local comfort cooling system.

What is Constant and Variable Air Volume System?

The Constant Air Volume System (CAV) keeps the supply air flow rate constant keeping the supply air temperature varied to meet the thermal loads of space. Variable Air Volume System, on the other hand, varies the air flow and the temperature.

What is BTU?

It is the British Thermal Unit which is used to measure heat. BTU defines the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.

Here are some common HVAC interview questions by CADD Centre Placements drive that can help you prepare for your job interview:

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The HVAC field is growing at a great rate adding more and more technical jobs every day around the country. If you too wish to start a career in this field, here are some of the things you need to master.

Mechanical Skills: Professionals usually learn these skills at their training. Being an HVAC professional, it is important for you to be comfortable working with the mechanical systems.

Time Management Skills: As it is a technical stream, you need to be highly organized by efficiently managing your time. In this job, you may need to answer several calls in a day and need to finish several tasks at a time.

Education: Apart from the engineering degree, you can get a formal certification to become immediately employable.

Licenses: Once you start your career as an HVAC professional, it is essential that you get certain licenses.

Apart from these, skills such as troubleshooting, and customer service management will help you accelerate in your career.

Get more certification course details from CADD Centre.

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