Gauge Readings For R22 - Piping Rock Lab Tech Job Descriptionsupport And Help For a low pressure gauge, a reading of 25 pounds per square inch (psi)to 40 psi is optimum. On the other hand, a high pressure gauge should read between 225 psi and 250 psi. In the picture, the manifold valve to the blue hose is closed so the blue gauge is measuring the pressure inside the running system. The vapor pressure is 118 psig and. Reading r22 hvac gauge r22 refrigerant operates at a relatively low pressure compared to modern alternatives.
Piping Rock Lab Tech Job Descriptionsupport And Help