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Posted by HeatPro on December 15, 2005 at 11:30:35:
In Reply to: Re: peerless boiler posted by joe on December 15, 2005 at 08:06:22:
The only purpose for focing the water in would be to check that the pressure relief valve works. This is a good idea in the summer, when the valve can be replaced if it gets dirt in the seat.
There is no evaporation going on inside good cast-iron, copper of metal sealed systems, so no need to introduce corrosion and lime by adding water with that in it.
The regulator is there to allow water to be added after servicing when water was removed. It is mistakenly left open because plumbers don't understand the point that there is no need to have water fed to the system unles there is a leak. The proper control to make sure there is a water problem is a low water cutoff to prevent the burner from funning until the leak is fixed. Having water availble to pop water in at the wrong time while the boiler is red hot is an occasion to cause an explosion. Not having the pressure reducing valve open and having a low water cutoff is safe. You will get bubble noises in the system a LOOONG time before you get to low water in a system with the pipes above the boiler, which is most of them. A system with the pipes below the boiler REQUIRES the installer to use a low water cutoff.
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