Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Dead solar

Chowdahead Member Posts: 59
The picture tell it all
You do not use pex on the primary side of a solar system and the relief valve is installed backwards.
More Pictures and we could walk you through


  • Glen
    Glen Member Posts: 855
    Most unusual -

    while resurrecting a thermomax panel system (3xH30)I noticed this little beauty. The hydronic panel mfgr is well known in this area - so I suspect the local handyperson. hmmmmmmm! (hint: the pex is the discharge)
  • Mad Dog_2
    Mad Dog_2 Member Posts: 6,944

    PVC, PEX The BIg Box stores &^ the like have made ANYONE who wants to be...an installer. Cute.....mad dog

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
  • Jeff Lawrence_25
    Jeff Lawrence_25 Member Posts: 746
    Just looked at the picture

    Is the relief valve installed correctly? Looks backwards to me.
  • Glen
    Glen Member Posts: 855
    Bingo -

    in over 30+ years - its a first! Much like the propane "expansion" tank.
  • Glen
    Glen Member Posts: 855
    Well -

    this is in a very high end cabin on one of the ski hills. It is what it is (timber frame construction, eg, no access). I am not able to make any changes to the primary side - but yes - the relief will be corrected. Other bits: for a 90 tube array - the primary side is undersized, as this home is completely finished I have no idea how the panels are piped, glycol is minimal (tyfocor will be pumped in next visit), wirsbo hepex is used throughout the primary side (I'm curious to see how well that works), & the exp tank has failed and will be exchanged for one that can handle increased acceptance. I'll take a few pics next visit - the cellcam just does not do it justice.
  • Ron Huber
    Ron Huber Member Posts: 121
    Old Thermomax

    If the system is 10 to 15 years old,you might want to check out the tubes and see if they still are working. They did not have the built in limiter back then and tubes lost their vacuum.
    Once they lose their vacuum, they are junk. We replaced one 120 system and a 30 tube system, and they both failed again within 2 years. They were the old Thermomax tubes.
  • Paul Pollets
    Paul Pollets Member Posts: 3,656
    The fix

    never seen a relief valve put in backwards....the installer gets a Darwin award.

    Pex is a No-no...I only use type L copper and insulate with R-5 covering. The primary side can develop over 240 degree temps..way beyond Pex ratings.

    As solar becomes popular again...we'll see lots of these installs.

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
  • Steve Ebels_3
    Steve Ebels_3 Member Posts: 1,291
    I looked at that

    I thought to myself...that relief valve is piped backwards..........nah, I must be looking at it wrong. Must be something else there that I'm not seeing........

    Just when you think you've seen it all.
This discussion has been closed.