McGiever wrote:Antifreeze is still most likely in there, it is now stained by iron oxide/rust due to abundance of
drzbob wrote:Thanks for the replies; My feeling is that we have a leak inside the boiler because I drained out a glass of water from one loop and its as clear as tap water, no pink color at all. The thermoPex pipeline goes from the stoker downhill (maybe 10-11 vertical feet) to the house which is about 70 feet away. ThermoPex has 2 heat pex inside a spray foam insulation that's then in a solid black outer casing. The pipeline is one piece from the stoker to the house. I think a leak inside the pex would run downhill into the cellar and be very easy to see in the house. All our pex is UPonor heat pex 3/4", an since I ran 80% myself its in area's of the house that I can look at or get to and NO LEAKS are seen anywhere in the house. I plan on pressuring the stoker ( we have isolation valves all over the system) as soon as the weather allows. All the valves are clean with no chaulking.
I also agree that air was in the system and we added a air relief device to the top of the stoker. I will also add that our incoming Pex line is dark gray along with zone one thats gray/brown, however the upstairs zone seems clear as can be? A real mystery, but the first floor runs 24/7 where the upstairs is on very little.
thanks again for the idea's. bob
Propylene glycol oxidizes when exposed to air and heat, forming lactic acid. If not properly inhibited, this fluid can be very corrosive, so pH buffering agents are often added to propylene glycol, to prevent acidic corrosion of metal components.
Besides cooling system corrosion, biological fouling also occurs. Once bacterial slime starts to grow, the corrosion rate of the system increases. Maintenance of systems using glycol solution includes regular monitoring of freeze protection, pH, specific gravity, inhibitor level, color, and biological contamination. Propylene glycol should be replaced when it turns a reddish color.
whistlenut wrote:Someone might explain the system design. Apparently there is no heat exchanger, however any normal looped system could easily be power-vented, so I am having a hard time understanding why there is any air in the system....unless there is no spirovent or air scoop......flow checks?? It is NOT that hard, we need more info.
Please tell me there are NO mono-flow tee's.................
Are you ABSOLUTELY sure there is no leak underground? I've fixed dozens of 'no leakers' where a fitting was NOT in place correctly, or seated deep enough.....or ........you fill in the blank.......I would love to hear some new ones.......(the ole 'Shark-Bite Fitting Slipped' is a favorite for OWB folks) .....The boiler went to 260 degrees and the pipe melted away.......How about: The boiler temp dropped below 140 and the circ stopped and the resulting freeze-up drained the boiler........OR 'I shut down the main switch to check the boiler'
There are a multitude of "Job Security Installs" everywhere!!!!! You can't change stupid......and ALL of us can be a victim one day or another!
Like the guys say: usually a 'anti-freeze protected install. has the feed valve closed and a low water cut off installed AND working. That K-6 should have NO problem keeping you warm....