Question about Taco Inc. WAGS7200 Shuts Off Water, Gas, Oil, Electric

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My upstairs air handler is not getting hot water from my oil fired Liberty Slant Fin model L30PT. I bench tested the Taco pump on the air handler and it works fine. The downstairs heat works just fine also. There seems to be no pressure going to the air handler/coil upstairs in the attic.

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  • 2 more comments 
  • petlor_2000 Nov 06, 2010

    If the pressure relief valve is bad, would that explain the 0 psi reading on the gauge for the oil burner?

  • petlor_2000 Nov 06, 2010

    The furnace has 0 psi. Could the expansion tank be the culprit for not having any water pressure to my attic air handler?
    I was told by another fixya expert that it may be the fill valve or pressure relief valve.

  • petlor_2000 Nov 07, 2010

    I traced the well water inlet pipe to the furnace and could not find a pressure reducing valve.
    Could the valve be after the hot water leaves the boiler? There are two Taco valves that have screw in tabs on top. The tabs are seated all the way down. Are these the pressure reducing valves?

  • petlor_2000 Nov 08, 2010

    Traced the piping from the well (40 psi at the well). It goes directly into the furnace via a 1/2 inch pipe. There is a wheel valve on the pipe and it is wide open.
    The pipe underneath the the bolier that supplies the hot water T's and one side goes to the air handler next to the furnace (this one is 160 degrees) the other part of the T travels to the air handler up in the attic. This pipe is cool at about three feet from the ground. The furnace still is reading 0 psi yet the downstairs heat is fine.

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  • Taco Master
  • 43,501 Answers

Hi,
You have a problem with your fill valve or pressure reducing valve...it is not uncommon for these valves to plug up or fail to work right.... this valve's job is to maintain 12 psi in your system.
If you do not have enough pressure it will not push the water to the upstairs air handler...
You also will then need to get the air out of the pipes for the pump to work right after getting the pressure problem fixed...

Here is a tip that will help you with that also...

Valve Pressure Reducing or Pressure Reducing Valve

heatman101

Posted on Nov 06, 2010

  • 2 more comments 
  • D. Floyd Kolb
    D. Floyd Kolb Nov 06, 2010

    Hi,

    The inlet to the valve may just be clogged....or the valve may be stuck...it is hard to tll as both happen very often...

    And if you go to look for the part ask for a "pressure reducing valve" and not a "relief valve" as they are two very different things...



    But yes I think that the pressure reducing valve or fill valve is bad and that is why you have that 0 pressure reading...it should be between 12 -20 PSI pressure at all times...

  • D. Floyd Kolb
    D. Floyd Kolb Nov 06, 2010

    It is NOT the expansion tank... that would create a differnt set of symptoms...

  • D. Floyd Kolb
    D. Floyd Kolb Nov 06, 2010

    Just an FYI if it was the "pressure relief" valve then you would have a steady flow of water running from the pipe off of the relief valve out of your boiler...

  • D. Floyd Kolb
    D. Floyd Kolb Nov 07, 2010

    It is possible that all you have is a valve to let water into the boiler and that their is no pressure reducing valve... Some contractors will skip that....to save money...
    But you do have to have a fill of some type to get water into the system....it may be a ball valve or a regular valve....

    It will probably be a small 1/2" pipe that goes into the boiler piping at some point.....trace the well piping to see if any pipes go from it to the boiler....then open the valve to get at least 12 psi in the boiler...

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