What should the super-heat be on a R22 valve?

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If super-heat is 20+ degrees above P/T chart reading, add more R22 until it is between 8 and 18 degrees. A super-heat of 12 degrees is often optimal (70psi at 85 degrees) Below 7 degrees super-heat indicates an overcharge. Close R22 container valve, disconnect hoses and replace valve caps.

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