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Look at the pointer on each gauge and the number it is pointing to is the pressure in psig. Under the pointer and below the pressure scale on the face of the gauge are 3 or 4 different colored temperature scales. Each color refers to a particular refrigerant. Determine which refrigerant you are using and the number in that scale is the corresponding saturation temperature at the pressure you are operating at. For example R-22 (light Green scale) at 70 psig = 40*F saturation temp.

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Q: How do i Read ac manifold gauges?
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