I remember when computer systems made their first appearance on a car. Today, basic jobs like altering the oil or turning the tires needs knowledge of how the computer systems tied to these systems work.
The developments in vehicle electronic devices have included safety and security and also benefit to today’s vehicles, and the fad shows no sign of letting up. Considering that this exact same modern technology is additionally utilized to offer owner comfort by regulating the car A/C system, it is essential that we become as acquainted with identifying their issues as we are when dealing with the refrigerant side of the system.
All of it Begins With a Computer system
Simply words computer strikes fear in the minds of some technologies … as well as it really should not. Computers can just act on their programming. They absorb info from their input sensing units and, based upon that information, perform the set jobs. This can be involving the compressor clutch, activating a mode door, or setting blower rate … simply put, the computer system turns points on or off.
Its language is made up of 0s and 1s, called bits. This serves in diagnostics, since that informs me as a service technician that the computer can just see these little bits; it can only see on/off, yes/no, or high/low. The info it takes in from the input sensors have to be in a language it can understand. The easiest way to do this is to utilize a sensor that offers an electronic signal to the module.
These sensors send either a high or low voltage relying on the state of the sensor. An instance of this would be an Air Conditioner demand switch that is either on or off. Sensing units that send out a varying voltage back to the component are called “analog” sensing units. These sensor signals are converted, or equated if you will, in the component to electronic signals the component can then refine.
A high stress sensing unit is simply one example of this sort of input signal. Since both of these kinds of input signals are electrical, it is very important to see to it they have not been damaged prior to the signal gets to the computer system. Go to the website of Matthews Buses Commercial if you want to buy a bus.
Low voltage to the sensor (whether it’s straight system voltage or a recommendation voltage provided by the component itself) or a negative ground (also straight or module provided) can trigger the signal to be overlooked or reviewed incorrectly by the component, and also trigger symptoms varying from periodic operation of individual features of the HVAC system to no operation of the system at all.
Since we get on the subject of power and premises, the component itself is an electrical gadget. It, also, have to have the proper voltage supply and a clean ground course to function the way it should. Detecting mistakes in A/C systems that only make use of one module to regulate the various functions ends up being a lot easier when we understand just how it works.
As professionals, we can link to the computer with our check tool to see what info the component is seeing. We can additionally examine the individual inputs with either a DVOM (electronic volt-ohm meter) or range to see to it the signal from the sensing units is proper. In many cases, we can also regulate the actuation of numerous outcomes with the module to validate the component’s capacity to turn them on and off.