how do you bleed the boiler?
To properly bleed a boiler takes time and Patience. Your boiler should have an auto fill valve to let water in. Hopefully you also have boiler drains on each zone. These drains will have a connection to hook up a garden hose. Direct the garden hose to a drain in the floor, or somewhere that will get rid of the water. Caution, this water is not only hot(180-200 Degrees) but can be very black as well, so choose carefully were you drain to. Turn one of your t-stats up so the zone you are working on comes on, you can feel the hot water by placing your hand on the pipe, again be care full, it is very hot. if the zone is open but not flowing, slowly opening the drain should push the air lock through. do not open or drain the zone to quick, you do not want to let the boiler go dry, bad things happen then. When you feel the hot water come back to the boiler through the pipe you know you have flow. You can hear the air in the pipes as it circulates and open the drain slowly to purge the air out. You need to do this to each and every zone in the system. It is advisable to have an experienced HVAC tech. do this if you are not comfortable, and watch him, ask questions. This is your system, you should know how and why it works. Good luck.
