ODDSNENDS4U wrote:How do I power vent the system?
Power venting a system is a method to quickly remove all trapped air in the system. It requires valves to be in specific locations so that extra fill water at water main pressure can be introduced and simultaneously be drained or flushed out. I works by having sufficient water flow, flow much greater than your circulator pump can achieve, to move the trapped air along and out the system. Much like when you first connect a garden hose to a faucet. It gurgles until all the air is out of the hose. From what you describe it's unlikely you have valves in the idea location to "power flush".
One piping method for power flushing is as follows. Assume your circulator is on the supply side of the boiler and follows the air scope. Fill water via a pressure reducing regulator is normally introduced into the bottom of the air scope. If there is a bypass on this regulator to allow full force water fill AND
a valve to shut off the boiler supply line prior to the air scope AND
a drain port prior to this valve. Then by putting a drain hose on this drain port and applying full force water you will "power flush" the system when the supply valve is closed. Full force water will flow through the system in the usual direction exiting out the boiler supply line. It's important for the flow to be in the proper direction so any check valves can open. It's also useful to have valves on any zones so that you can direct flow through each zone independently. You will need to adapt this full flow idea to your particular piping situation, for example it would be slightly different if your circulator is on the return side of the boiler.
Power flushing is very effective. It can get the trapped air out of any system in a hurry.