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What You Should Know About HVAC Service Contracts

Nothing beats sitting in your air-conditioned home when the temperature rises and sweat beads form on your forehead. Nothing is more aggravating at that time than when your air conditioner starts to pump hot air.

If you’re one of the almost 100 million people in the United States who have air conditioning, you know how frustrating a broken HVAC system can be.

When your vents start blasting heated air, you can better grasp what’s wrong if you comprehend an HVAC system diagram.

Continue reading to find out everything there is to know about HVAC system diagrams.

What Is An Air Conditioning System?


Your home’s HVAC system is in charge of heating, ventilation, and air conditioning.

Any unit that can heat or cool is referred to as HVAC. As a result, everything from large units outside factories to little units outside your home qualifies as an HVAC system. Thermodynamics, heat transmission, and fluid mechanics are all used in good HVAC systems.

These are all technical phrases that signify the system will heat or cool the air in your home to maintain a consistent temperature.

Cooling air is more complicated than simply blowing more air around and producing a current. Instead, your HVAC system compresses air to make it warmer before expanding it in your home to make it cooler than it was before.

What Are The Parts of An Air Conditioning System?


The indoor and outdoor components of an HVAC system are separate entities. When you stroll by residences in your neighborhood or even companies in the city’s metropolitan areas, you’ll notice a large box either behind the house or on top of the company. This is only half of the complete HVAC system.

Equipment for Air Conditioning

The air conditioner equipment is the exterior component. It usually includes the following elements.

1. Fan

The exterior unit’s visible and audible component is the fan. When you look down into the air conditioner box, you can see a fan. Outside air is drawn into the box, causing a current to flow across and into the compressor.

2. Compressor

The compressor is the machine located inside the outdoor air conditioning unit.
This is an important part of the air conditioner that provides high-pressure air or other gases. It compresses the air drawn in by the fan from outside the unit.

3. Coil for Condenser

The condenser coil is located outside of your home, within the air conditioning box. The heat from the refrigerant is cooled or removed by these coils.

4. Tubing with refrigerant

This tubing runs from the exterior to the interior of your home. Between the condenser coil and the indoor evaporator coil, it circulates the refrigerant.

The outer section of your HVAC system brings outside air inside your home, but it accomplishes more than that. It compresses the air, heats it, and then forces it to the indoor unit, where it is removed.

Equipment for Forced Air Furnaces Using Gas

This is the unit you’ll find in a utility room or basement of your home. It will resemble a large box with several tubes or coils protruding from it, and it will be made up of these components.

1. Coil for Evaporator

This crucial component is located on top of your home’s box. Your furnace blower will circulate air across the coil, which will cool when it contacts the cold coil. The heat from the warm air will be transferred to the refrigerant.

2. Blower

The air current that travels across the evaporator coil is created by the blower.

3. Filter

The filter is a porous device that, depending on the sort of filter you have, you can change or clean. Impurities will be present in the air you breathe outside. As the air flows across the filter, allergens and pollutants are removed.

4. Duct for Return Air

This duct can be found in your home’s rooms. It is responsible for transporting air from that room to the mixing air duct. This duct will not blast air into your home, thus it will appear to be a vent but will not be operating.

5. Air Conditioning Unit

The blower and heating or cooling units are housed in the enormous box in the basement or utility room known as your AHU. Filter racks and chambers are included, as well as sound attenuators and dampers. It connects to your home’s ducting.

6. Duct for Air Supply

These are the extensive ducts that transport conditioned air from the ASU to your home’s rooms.

All of these elements work together to maintain a constant temperature in your home.

How Does An Air Conditioning System Work?


So, how do these components interact? What is the procedure that changes hot air into cold air or vice versa?

Central Air Conditioning

You will have a central cooling and heating unit if you have a split system. This is how the central air conditioner works:

  1. Warm air is first blown over the indoor evaporator coil.
  2. The heat is transferred to the refrigerant within the coil. The air that flows through the coil is cooled as a result of this transfer.
  3. The refrigerant from the evaporator coil is subsequently pumped back into the compressor, and the cycle is repeated.
  4. The heat absorbed by the refrigerant is blown outside the property, while the cold air is blown inside.
  5. The moisture in the air condenses, resulting in cold, dry air in your home.

Heating System Central

Although central heating may not have the delicacy or enchantment of central cooling, it is nevertheless a vital component of any HVAC system.

  1. Combustion gases ignite inside your furnace and flow through the heat exchanger.
  2. The air from your home is heated as it passes through the heat exchanger.
  3. Warm air is blown through ductwork in your home by your furnace fan.

Why Is It Important to Understand The HVAC System Diagram?

When you know what an HVAC system diagram looks like and how your HVAC system works, you can make educated decisions like when to replace your old unit.


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Written by HVAC Contributor

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