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Re: Robinair AC690PRO Fault code of 'HIGH PRESSURE'
Posted to HVAC Forum on 2/1/2020 4 Replies

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Air is a gas made up mostly of 20% oxygen and 80% nitrogen. R134A is a different and heavier gas. There is pressure without air. If the cylinder has no air and is at 70F there will be 71.1PSI.

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