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STOP blowing down..period..Only if you see water bouncing in guage glass or if the boiler shuts down intermittently due to low water then restarts after it has been off awhile then you may have to add a little water into the system and if the conditiond persist you will have to have the boiler chemically cleaned.
The LWCO is a safety device that can't work if its loaded up with sediment. It must be blown down on a regular basis in order to keep it clear of sediment that can prevent the float from moving down and opening the safety switch.

I have changed out boilers that cracked from dry firing due to the LWCO not being blown down on a regular basis. Peerless, Weil Mclain, Burnham and others will inspect the cracked boiler to see if it was dry fired and void warranty on it.
 
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OK let's go back to basics. New boiler/system installed..do initial boil out of boiler to rid of contaminants...refill with water...water has X amount of contaminants that will precipitate out of the water once it reaches boiling point and produces steam..the X amount of contaminates is very low BUT, if you blow down, then you have to replace the water with new water which adds more contaminants..you are much better off reducing any blow downs ..just test LWCO.. monthly and just drain minimum amount of water from boiler annually...just below LWCO..disassemble and clean..so, some blow down IS recommended however, excessive blow down creates more impurities/sediments and premature failure of the boiler....in this case I am talking about a closed steam system...too much blow down = too much sediment. I was just frustrated by the excessive blow downs being recommended but, I did submit proper procedures including some blow downs. I too have seen boilers totally plugged with scale but, they were commercial applications where all the steam wast to process. That is totally different I also said to drain boiler to check for sediment build up in bottom but, if I had it from new..only every 2 years. Actually I wouldn't have a steam system. Too much maintenance and lack of control. Convedrt system to hot water if possible. Much better. But, I know...not very practical.
 

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Both single and 2 pipe steam systems have vents. They let air out and they let air in. When they let air in, it causes some minor oxidation on the boiler and the pipes. So new impurities are added to the boiler from normal use. Also, some moisture vapor goes out every heating cycle as the vent vents the air out of the system. A small amount, but it eventually has to be made up with fresh water. A monthly LWCO blow down will never hurt a steam boiler.

Draining sludge off the bottom of the boiler once every 2 years is more then enough for any residential steam boiler.

many new steam boilers are now installed using electronic LWCOs. So monthly blow down is not needed on them. But the sensor should be cleaned every year.
 
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Thanks Beenthere..The main point I was trying to make all along was that blowing down too often will cause excessive sludge build up. When I said stop bllowing down I meant that the OP was really over doing it. However, if you have a boiler/system that already has a lot of sludge/oils etc. then, a total boil out and flushing will be required before you can revert to "normal" operation and maintenance procedures. Thanks again. Techpappy
 
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