How to Read R22 Gauges
Central air conditioning units have a built-in gauge that monitors their pressure and the amount of refrigerants in the unit. The R22 gauge is a compound gauge that can measure the pressure of the system, expressed in pounds per square inch, or psi, as well as the temperatures of the R12, R22 and R502 compounds in the system. The gauge indicates whether the air conditioner is working properly. Markings on the gauge indicate the different types of pressure of the system, including the system pressure and the high pressure of the system.
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Instructions
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Look at the position of the arrow on the gauge and write down the numbers from each gauge marking. The gauge markings move inward and are color-coded to indicate the different compounds.
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2
Read the outer, black numbers to find the pressure of the system. The pressure will range from -30 psi to a variable high number, such as 100 or 500 psi.
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3
Move inward to the next gauge marking to read the temperature of the R12 compound. The temperature may be presented in degrees Celsius or Fahrenheit, depending on the gauge.
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Check the next inward gauge to find the temperature of the R22 compound. Don't worry if the temperature is different from the R12 temperature; each compound will have a different temperature.
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Read the innermost gauge to find the temperature of the R502 coolant compound. Check these temperatures with your coolant system manual or with a coolant expert to make sure they are within their proper range. The range will vary depending on the system.
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