Simply put, it is a diagram of the internal parts of the HVAC (heating, ventilation, and air conditioning) system. You must understand that it is merely a map, and a map cannot tell you what you want to do with your HVAC. It may tell you which part of the system needs to be repaired, but it can not tell you which part of the system needs to be replaced.
You will still need to make the necessary repairs, and add in new parts at the appropriate time. The important thing to remember is that an HVAC system diagram will only give you an overall general idea of what the system looks like and will NOT tell you whether or not the system is properly maintained.

HVAC system diagram
For example, let’s look at an HVAC system diagram of a split heat exchanger. First, note the location of the condenser on the inside wall of the heat exchanger.
This is depicted as a yellow oval on the diagrams. Note that the two different colors, yellow and green, denote the locations of the condensers, and the inside “X” represents the location of the external air inlet or outlet to the outside air.
Now, note that the location of the vent (i.e., the open end on the top of the heat exchanger) is represented by the black portion of the diagram.
Final Words
This may seem like quite a complicated illustration, but it illustrates the basic principle behind an HVAC system diagram. In short, the Air conditioning Sutherland Shire diagram gives you a visual picture of the condition of the system at a particular point in time, and lets you know what specific components need to be repaired, replaced, or added to the system at that particular time.
In this way, an HVAC system diagram can be a great reference to help an individual maintain their heating and cooling system safely, and efficiently. It is also helpful to a professional contractor or heating and cooling company to ensure that they are performing their job properly and up to code.