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Ram Guy 10-09-2011 05:31 PM

In floor heat...without the heat?
Hey I think I have air in my radiant floor system...It is a closed boiler system. When it is running the supply lines get hot but after an hour or so the return lines are still cold...You can hear air in the system. I have a spirovent in it. I just really have no idea how to bleed it. Can someone tell me how? Is there anything I'm sposed to do with that spirovent? Like maybe open it or hit it or something?:whistling2: Please explain it like i'm a 5 year old-I know very little about this.


oh'mike 10-09-2011 07:21 PM

Ram---I'm going to move this for you---HVAC is the spot--several good boiler guys there---Mike---

Ram Guy 10-09-2011 07:37 PM

Thx Mike! I wasn't too sure if I was in the place.

oh'mike 10-09-2011 07:41 PM

I have hydronic heat but I've only installed four or five in my whole life---

There are a few men here who have a lot more knowledge than me----You will get an answer soon enough.

One is on every morning about 5:00----be patient----

oh'mike 10-10-2011 07:40 AM


Ram Guy 10-11-2011 11:56 AM


beenthere 10-11-2011 03:48 PM

Post pics of the piping. both at the boiler, and at the radiant manifold. So we can see what your set up is like, and advise from there.

Ram Guy 10-11-2011 09:05 PM

Here's 'em pics...

beenthere 10-12-2011 04:27 AM

I don't see a purge set up on that piping. They may have purged it through the strainer when they originally installed it. An it can be done that way again. Shut off the valve at the boiler. Then shut off the one on the return at the manifold . Remove the strainer plug,(some water will come out). Then screw in a drain valve and connect a garden hose to it. Reopen the valve at the manifold, and the new drain valve, bleed/purge each loop separately, until no more air comes out. Close drain valve and valve at boiler. Leave the new drain valve in the strainer.

Ram Guy 10-12-2011 09:22 AM

2 questions. Where would the strainer plug be? Can I flush and fill with water or should it be filled with some RV plumbing antifreeze?


beenthere 10-12-2011 04:06 PM

Third pic, the Y shaped brass piece is the strainer. The strainer basket is inside it.

Just purge by adding water to the system. Antifreeze(glycol)reduces heat transfer, and lowers the efficiency of heating systems.

Ram Guy 10-12-2011 10:22 PM

K...gotta get a couple parts to continue. When I drained it I'm sure glycol came me thinking. If I flush it with water and the boiler decides to crap out, I may ruin the whole system if it freezes. With that said, it is normally just water in these systems correct?

beenthere 10-13-2011 04:04 AM

Glycol is normally only used where long durations of power outages occur. So normally only water is used in them.

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