SOL-Perpetua™ Solar Water Heating System Installation Instructions and Operating Manual For Series "A" Pumps
SOL Perpetua™ System Maintenance - Operating Pressure
Near sea level, if the gauge at the pump does not read 25" Hg or even a higher vacumm when the system is cold, say in the early morning, there is probably some air in the pump. Remove this air with the hand pump. If the gauge shows an increase of pressure over the next few days there is air coming into the system. Refer to TROUBLE SHOOTING.