Hello, friends! Today I will tell you how to properly refill an inverter air conditioner. Using the Mitsubishi Heavy model as an example, I will explain all the stages of this process and important points that you should pay attention to. If you need to repair or refill your air conditioner, I recommend contacting professionals. For example, you can order heating and air conditioning service near me from A Plus Heating and Air.
What is an inverter air conditioner?Inverter air conditioners, such as the Mitsubishi Heavy, differ from conventional ones by using an electronic expansion valve instead of a capillary tube. This makes them more efficient, but also requires a special approach to refilling.
Many people believe that refilling inverter models should be special. For example, there is an opinion that the air conditioner should be turned off and unplugged so that the valves remain open. However, experiments show that this statement is not always true.
Preparing for refillingSystem diagnostics.Before you begin, make sure there is no air or moisture in the system. To do this, use nitrogen to clean the system and a vacuum cleaner to prepare it for charging.
Checking the equipment.Connect the indoor and outdoor units, connect the pressure gauge and make sure everything is sealed. At this stage, it is important that there is a slight nitrogen pressure in the system.
Charging stagesRemoving residual freon.If there are any gas residues left in the system, they must be removed. To do this, use a vacuum cleaner to reduce the pressure to zero.
Charging with freon.Use R410A freon, as specified in the technical data sheet of the air conditioner. Place the freon cylinder on the scale to accurately measure the required amount. For example, Mitsubishi Heavy requires 1.05 kg of freon, but you need to add another 30 g to compensate for the length of the hoses.
Checking the supply.Charge slowly. Open the tap little by little so that the freon flows into the system evenly. The compressor will work as a pump, sucking freon from the cylinder.
Important pointsShutting off the valves.During the experiment, it was proven that the electronic expansion valve (ERV) does not completely shut off the line. It is important to take this into account in order not to make a mistake during the filling process.
Filling methods.It is best to fill the air conditioner by scale, since filling by pressure may be inaccurate. Filling by overheating is also not suitable for inverters, since the compressor changes its performance, and the overheating remains near zero.
Protection against water hammer.Air conditioners are equipped with a liquid separator, which prevents liquid freon from entering the compressor. This makes the process safer.
Final stageAfter filling, check the operation of the air conditioner. Make sure that the compressor starts, the pressure is stable, and the fans are spinning. When everything is ready, close the taps, turn off the equipment and seal the service ports. Now your air conditioner is ready for installation and full operation!
Helpful adviceIf you are not confident in your abilities or you do not have the necessary equipment, it is better to entrust this work to professionals. A Plus Heating and Air offers air conditioning repair services near you. Their specialists will provide high-quality results and take care of your comfort.
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