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Posted by Pete on October 22, 2006 at 21:43:43:
In Reply to: Re: boil out needed for brand new boiler? posted by HeatPro on October 22, 2006 at 19:47:35:
Thanks for the quick reply- a couple of follow up questions:
1. If I've removed the safety valve and I'm draining it from there while heating the water, how do I make sure it doesn't get out of hand (and stop it when I'm done...)? Will water/oil only come out from the top when I add make-up water? Do I need to lower the gas pressure to the boiler to keep it in check that way?
2. How would I go about blocking the return path? Wouldn't it be adequate to simply open the condensate valve while running the system and run that over to a drain? Do I need to be adding a lot of make up water while doing this to keep it from running dry?
3. Assuming that all goes well- do I need to add some preservative type chemicals in the water? I've heard of people putting antifreeze in boilers but that sounds dubious to me.
: Skimming is usually done by the installer, as it is necessary to get good operation. Chemicals are usually not needed; but removing the pressure relief valve from the top of the boiler and adding water by cracking the fill valve slowly while heating the water to waste the water from the spillover until the water is clear is a way to clear the oil off the top. Emptying water from the bottom lets the oil slick back onto the walls as you drop the level and then the oil comes off to the top of the water if not skimmed.
: When the oil is gone from the water, the relief valve is reinstalled and the system allowed to run. Much dirt will often come down after a boiler change, so the return water is wasted by blocking the return path from entering the boiler to divert the water to the drain.
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