Showing all 3 results on How to Attach an Air Conditioning Manifold Gauge and Perform Basic Refrigerant Pressure Readings If you suspect your home’s central air conditioning system isn’t operating properly, you can tell a lot simply by measuring the system’s refrigerant pressures. It may seem intimidating to perform your own system pressure tests, but it is actually quite straightforward to do so. Below is how to measure your central air conditioning system’s pressures to help know whether or not you should contact a technician for servicing:
The equipment needed Measuring the system’s pressure requires a few tools and pieces of equipment. Below is what you need: Air conditioning manifold gauge – a basic air conditioning gauge actually consists of two related, but separate, gauges. In addition, three hoses—red, blue and yellow in color—lead to the gauge manifold that joins both gauges and their hand-valves. You will not need to use the yellow hose for measuring your system pressure. Most gauges are designed to be used with systems containing different types of refrigerants (e.g., R-22), so be sure to know which scale is appropriate for your system when referencing the gauges. Charging chart – this is a visual reference that provides detailed data about normal system pressures within both the suction and high-pressure lines. This information is available in the manufacturer’s service manual for your particular system model. • Outdoor thermometer • Adjustable wrench • The measurement procedure 1.Turn off the main power switch for the system – most central air conditioning systems have an outdoor main power switch located near the outside unit; be sure to turn off the power to the system to prevent electrical accidents or damage to the system.
2. Locate your system’s gauge connection valves – central air conditioning systems contain two refrigerant lines connected to the outside units that house the condensers and compressors. The larger diameter line is the suction line that returns gaseous refrigerants to the condenser. The smaller diameter line is the high-pressure line, which is sometimes called the liquid line. At the point where the lines enter the outside unit, look closely and you will see valves that are most likely capped shut. These valves are for the purpose of monitoring refrigerant pressures, both suction and high-pressure.