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Re: Robinair AC690PRO Fault code of 'HIGH PRESSURE'
Posted to HVAC Forum on 2/3/2020

Is this where I insinuate that refrigerant gas and air are the same? The word "different" kind of covers that.

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 ha... Login to read more.