Test the thermometer in ice water, should be 32 degrees F. How do you know room temperature is accurate? Use an accurate thermometer. Adjust your gauges to the room temperature. Set a bottle of virgin 410a refrigerant in a room with a stable temperature, then hook up your gauges. You can either remove the face-plate by unscrewing it, or some may come with a small rubber insert that pops in and out.Ī more accurate way of calibrating manifold gauges would be to use the refrigerant method. This is done by adjusting the flat head screw underneath the face-plate of the gauge. Several hvac technicians that I’ve worked with have been trained to set there gauges to zero. But what if you have regular manifold gauges that aren’t digital? If you are using digital gauges you can just ‘zero’ the gauges out to atmospheric pressure, and from there you are good to go. Calibrating Manifold Gaugesįirst thing you need to do is make sure that whatever type of gauges you are using are calibrated. If you know all of these are good go ahead and skip to Charging a A/C System. Although I know that ‘gas and goes’ happen all the time in this industry. Refrigerant leaks should be fixed prior to charging a system. For the purpose of this article, I am assuming any refrigerant leaks are fixed and the system is properly evacuated.Outdoor temperature above 60 degrees F for air cooled systems and above 70 degrees F indoor temperature.Verify that your air flow is good, clean filters, coils, proper duct size.Making sure your equipment is calibrated, gauges, temp meters.There are several steps that should be taken before attempting to charge an a/c system. Before Charging a Split Air Conditioning Unit But if you want to see how I charge a central a/c system, continue reading. There’s lots of different equipment out there, and if you want the real answer on charging an air conditioning system, I might tell you to charge the unit according to manufacturer specs. Before attempting to learn how to charge an a/c system, you need to have your Section 608 Technician Certification Type 2, or Universal.
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