Under Floor Heating
- coalmeister
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I had access to half a dozen 1-1/4 diameter steel pipes so I ran them under the kitchen floor, as my wife complains the floor is cold since I installed the coal boiler in the garage. I only have 1 zone for the entire house so I used the "taps' from a disconnected radiator. Got it all hooked up and now the water just doesn't bother to run through it Should I put a spare Taco pump on it and will it draw water through the other main Taco pump (I would need it to) when the main Taco is not running? Thanks!
- coalmeister
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It has a main line in and out with each radiator teeing off from the pressure side and the return side.
did you put a vent on it to get rid of the air ,all of the air either that or did you put a purge station on the line ??
- coalmeister
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I thought about a vent of sorts but did not know how to vent all six 8' pipes? I ran water through before making the last connection but may not have got out all the air and I need to prevent it in the future I guess
- Rob R.
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Monoflow systems are very sensaive to air, plus it is questionable if there is enough pressure drop between the two tee's to cause flow through 50' of pipe. I would start by adding a ball/purge valve just before the correction to the return tee.
- coalmeister
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I do have a ball valve there, should I close it off a bit? I have a spare Taco pump, should I add that at one end or the other? - Thanks!
- coalmeister
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Rob, Even if the pump is positioned in a vertical section that is always full of water?
if you have a flooded suction on the circ it will push the air around if it is less than 6or 7 ft above the circ taco 007 aprox 8' head
- coalmeister
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I could turn it into a "flooded suction" system long enough to get the air out
- steamup
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You will probably have to install a tee in your "radiator" at the high point to vent the air. 1-1/4" pipe is hard to vent by pushing the air with water even with a purge valve. The volume of water needed to purge is greater than the average purge valve can handle sometimes.coalmeister wrote:I thought about a vent of sorts but did not know how to vent all six 8' pipes? I ran water through before making the last connection but may not have got out all the air and I need to prevent it in the future I guess
A tee with a reducer and a 4 inch nipple will make a great air collector. I will often use one and put a elbow on top and extend my air vent to get easier access. you can vent with a small ball valve or coin type air vent.
- Sting
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Was this an old MONO FLOW SYSTEM or was it originally dedicated supply and return piping?
it makes a difference and Ill bet the rest of the system will fail if you get it wrong
it makes a difference and Ill bet the rest of the system will fail if you get it wrong
- coalmeister
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Thanks for the help guys, I got it working! I drilled an air relief hole in the connector pipe between 2 of the main pipes and tipped the pipes up one end at a time, and "walked" the air out of each pipe going pipe to pipe to the relief hole. It actually works pretty well now, the floor is 81 degrees and I have not even insulated the pipe area yet. The floor was about 60-65 before. Cost me less than 50 bucks in fittings & connections. Next summer when the heat is off I will do the whole kitchen.