In-floor radiator- air in the system ?

Old 11-06-05, 08:36 AM
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In-floor radiator- air in the system ?

If my floors do not warm up and the return leg is always cold (although the supply is hot), can it be due to the air in the system ??

If so , what is the best remedy ? Purge the system ? Am I right ?

Now ho do I purge the system ....Here is my plan - please, give your comments:

1. shutoff the hot water supply to the heated floors (I do have a valve that would allow me to isolate the floors)
2. shutoff the return leg of the floors

Basically after (1) and (2) my floors will be isolated from heater on both the supply and the return leg.

(3) Connect the hose to the vent on on the return leg and have the water drain.

(4) I also have a vent on the supply line. Should I drain through it as well ?

(5) When all set and done, the floor system will be dry ? I will connect it back to the boiler .

Your comments appreciated.
Old 11-06-05, 03:49 PM
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You don't want to drain the circuit. What you want to do is push water through the loop and back out to the drain. Open the valve that supplies the manifold. Close the valve between the manifold and the boiler and open the drain on the manifold. That will push boiler water through the loop(s) and out the hose. As long as you get enough air out to allow circulation, the rest of the air shoul dbet vented at whatever other air elimination device you have.


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