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Old 12-06-2009, 05:14 PM   #1
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Mold growing in the radiant tubing lines

I have a new home with a new Triangle tube boiler. It appears I have mold growing in the radiant tubing lines.I assume this cant be good for the system. Any suggestions or other threads with the same subject. Any help would be appreaciated.


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Old 12-06-2009, 07:39 PM   #2
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Provided that none of the pipes or boiler parts are aluminium or other bleach sensitive material I suggest doing this:

1. Let the entire system cool down.

2. Drain the system (don't do every nook and cranny) but measure the quantity of water you get out.

3. Put bleach or other mold killer into the system. I'll have to let you do the math homework using the figure obtained in step 2 in order to obtain the proper amount of bleach.

4. Refill the system which will bring the bleach to the proper proportions.

5. Run the circulator pumps with the burner off.

6. Do some bleeding of the system as it runs.

7. Drain the system again, this time discarding the solution.\

8. Repeat 4 through 7 once more to get out more of the bleach considering you are not draining every nook and cranny.

9. Refill the system.

10. Turn the heat back on.

11. Bleed the system, this time being more thorough.


The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.

Last edited by AllanJ; 12-06-2009 at 07:41 PM.
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Old 12-06-2009, 08:12 PM   #3
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Ditto what AllanJ said, and...

...when the system's drained, it's a good time to replace any can/bucket vents - especially the one on top of the air scoop. I'd even recommend going a step further and replacing the old style air scoop (if that's what you have) with a "Spirovent" air separator:

Here's a Taco Air Scoop ("old style"):

...and the Spirovent:

The main problem with the old air scoop is that (if you read the installation instructions), you're supposed to have a straight pipe a minimum of 18" long leading into it so that the water enters it without excess turbulence. Most intallations I've seen have a short nipple right off a 90 degree bend into the air scoop. The spirovent works effectively either way.

Last edited by Ishmael; 12-06-2009 at 08:19 PM.
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Old 12-06-2009, 08:18 PM   #4
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I hope you used Pex with a oxygen barrier.
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