What is the best way to purge a hot water baseboard heating system?I seem to have a lot of air and system seems to be not flowing at all
The answer to your question depends on the design of your heating system. There are two common piping arrangements. The first is called a Venturi system. In this type of system you have a main loop that runs around the house with "scoop" tee's that force the water through each radiator/baseboard in the loop. With this type of system you must bleed each radiator individually. At the end of each radiator you should find a bleeder that will require either a flat head screwdriver or a square "key" (available at the big box hardware stores) to open the valve and bleed. This can be a somewhat time consuming process as to do it correctly you must go around the entire loop (preferably in the order of flow) 3 or 4 times to ensure you have moved all the air out of the system.
The next type of arrangement is know as a standard loop. This is where the water flows from one baseboard to the next, in a loop. (ie the baseboards are connected to each other, not just pulled off a common loop). In this type of a system you should find a "stop and purge" set up at the boiler. There should be a valve on the return close to the boiler, and just above that a boiler drain. (faucet type fixture). If you close this valve, connect a hose to the boiler drain and let the water flow into a bucket, you will be bleeding the hot water loop. If you have more than one zone, you will want to close all the valves at the return, and bleed each zone out indiviadually. After all zones have been bled, you can then re-open the valves.
As a note, you should see a water feeder located on the piping going into the boiler. (This device is connected to the cold water line that feeds all your household fixtures. ie sink, tub, etc) If you move the lever to the fast fill position it will allow water to flow into the boiler at a much faster rate, thus helping you push the air out easier. This is only really possible with the Standard Loop layout, because you need to monitor the boiler pressure anytime it is "fast filling". If you are "fast filling" you MUST ensure to release the lever prior to closing the boiler drains or you run the risk of causing the pressure relief valve to open, which can and will cause personal injury and property damage.
Hope this helps
Mar 03, 2012 |
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