Bleeding secondary loops
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Hi all I'm starting to get some gurgling sounds from my manifolds and want to bleed them. They are right under our bedroom. How many gallons could/should I bleed without hurting the coal gun.
- nepacoal
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Looks like you have several purge stations right there... If your feeder valve is working you should be all set. Just purge the loop that's making noise.
- nepacoal
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- Coal Size/Type: Buck
If you're not sure how to purge, check out this YouTube video at the 16 minute mark. This plumber shows how to purge in every other video he puts out
- nepacoal
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- Hand Fed Coal Boiler: Harman SF-260 - retired
- Coal Size/Type: Buck
If your feeder valve is on the supply side, the cold water will never make it to boiler... (As long as the purge station is on the return side).
- nepacoal
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- Coal Size/Type: Buck
Be safer to shutdown and let it cool off some. Steel isn't as susceptible to thermal shock as cast iron, but I'd err on the side of caution. Kind of tough with an AHS with all that coal in the burn chamber. The fire on my kaa-4 only takes about 20 minutes to go out.
Hopefully someone with more experience will chime in...
Hopefully someone with more experience will chime in...
- Rob R.
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Purging the air out of a radiant loop with a mixing valve is very difficult. What I ended up doing in my house was using a garden hose with domestic water pressure to purge the loop until it was totally full of air. Based on the way your system is piped, you can likely isolate the radiant loops from the boiler, and run domestic water through the loop until it runs free of air. If you do this it is important to make sure it is isolated from the boiler so you don't open the relief valve.
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- Other Heating: Lopi Liberty
Do you think that using that mixing valve is a poor design?Rob R. wrote: ↑Wed. Dec. 15, 2021 7:35 pmPurging the air out of a radiant loop with a mixing valve is very difficult. What I ended up doing in my house was using a garden hose with domestic water pressure to purge the loop until it was totally full of air. Based on the way your system is piped, you can likely isolate the radiant loops from the boiler, and run domestic water through the loop until it runs free of air. If you do this it is important to make sure it is isolated from the boiler so you don't open the relief valve.