how do you get air out of hot water base board oil furnace?

Question

Making loud noises and sounds like the toilet is flushing when starts up

Answer 1

You will have to bleed air from the system. Not a major job...

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Hot water exits the furnace and flows through a ball valve, past the drain valve, and circulating pump. The expansion tank is green (tank has been relocated to allow easier access on side of furnace, compare to other pictures), above is the automatic air purge screw at the very top. From here the water will flow through the source manifold, through the zone valves, and warm the room. Cooled water returns through the return manifold to the base of the furnace where it is heated and recirculated.
To bleed air from the system, turn off the furnace AC power switch to prevent the furnace from running constantly. Attach a hose to the drain valve and turn off the ball valve beneath the drain. Open the ball valve to allow cold water to enter the furnace. Open the drain valve and push the lever at bottom of the zone valve to allow water to flow. Watch for bubbles at the end of the hose. When there are no more bubbles close the zone valve and move to the next one.
After all zones have been purged, close the drain valve and cold water intake valve. Now open the ball valve beneath the drain and the system should be ready to go. Any small bubbles remaining will be automatically purged. Make sure the black screw above the expansion tank is loose to allow air to escape.

Answer 2

This is my experience. I grew up in a house with hot water radiators. The temperature was steady and even, never too hot or too cold, except if a lamp was on next to the thermostat. I have now lived 14 years in a house with forced air heat and I can say that I hate it. The temperature gets really cold and then super hot air fills the house. While the furnace is on, I am literally sweating it's so hot for those few minutes. The furnace goes off, it's comfortable for a while, gets cold, then the cycle starts again. Yes, it heats the house up "fast" like you want, but honestly, it's not comfortable. And it makes a LOT of noise--the hot water radiators at my parents' house never made any noise. If you block any of the grates, you get poor circulation or one room may be colder than others. The grates on the floor collect dust, dirt, change and other small objects. It's a total pain. It would be easy to add central air, that's about the only bonus. I have an oil furnace which was once top of the line but is probably 25 years old now. I doubt changing the furnace would change the experience much, however. I'm sure other people will quote studies & articles on which is better and why, but I think the actual experience of living with it is more important. I'd pay more for even, quiet heat.

Answer 3

Some where on each run of baseboard there will be air venting valves. Look at the baseboard in the corners and snap off the covering. When you see a place where the pipe turns at an elbow and goes down into the floor you will find a screwdriver slot on the top of the elbow (usually one end per room). While the heat is on, get a screwdriver and turn the screw head slightly counterclockwise till you hear air hissing out and keep it open till water starts to bubble out. Then shut the screw tightly by turning clockwise. Repeat at each baseboard section.

Answer 4

Find your highest base board heater.There will be a bleeder valve on this heater.open the bleeder valve,air should come out let this happen until water squirts out in steady stream,then close bleeder valve.This may not take long so stay with it.The bad part is if you have air in your system you might have a small leak in the system (a small amount of water may come out before the air) Giver hell and get that thing fixed.

Answer 5

start at the farthest radiator from the furnace and bleed the air working toward the furnace to all the radiator. In the future install automatic bleeders. It will save you a lot of work