Results 1 to 12 of 12
  1. #1
    Join Date
    Dec 2005
    Posts
    4
    Hi folks. I'v got a teledyne-Laars minitherm 2 boiler system. I did not have the unit cleaned last year and now problems have developed with carbon buildup on the heat exchanger which prevents proper operation. The HVAC tech is saying the unit should be replaced vs. an acid bath cleaning of the exchanger.
    Regardless, I'v considered this unit to be a lemon (numerous problems with rollover switch, melted electronic controls etc)

    I'm looking for a unit that will be reliable (obviously with the proper maintainance) Any suggestions to my situation???

    Thanks
    Grobinso

  2. #2
    Join Date
    Feb 2003
    Posts
    1,996
    SOmething else must have been wrong for so much carbon build up in a year. Maybe the return temps were too low and soot was forming in the heat exchanger. The minitherm is your basic efficency gas boiler. What ever you get make sure it's installed right because something killed this one. Do you have large cast iron rads and pipes?

  3. #3
    Join Date
    Sep 2002
    Posts
    3,708
    Yes I do..I nice big castiron boiler that has bigger passage way that are not so restricted.

    And I mean on both side of the hx.

    Minitherm sound over hype to me as well.

  4. #4
    Join Date
    Jun 2003
    Location
    New Hampshire
    Posts
    2,666
    Something isn't right. These boiler get sulfer builup between the fin tubes on the heat exchanger after many years. But one year shouldn't make a difference. They have to be cleaned from the top and bottom with baffles and burners removed. If this wasn't done last year or ever then this is the problem.
    If you have a lot of excess builup every year then maybe you have venting problems. Maybe you have only single wall smoke pipe instead of b vent, low temps in this vent piping causing water from the vent pipe to run back to the boiler.
    Or you have high sulfer content in your gas. This would be a problem in any boiler.
    Or no bypass piping between supply and return water piping, especially in large cast iron radiators causing condensation on the heat exchanger.

    Regardless, if the boiler is close to 20 years old, I would get a new boiler as there is not much life left in this one after 20 years.

    Peerless makes a nice gas boiler.

  5. #5
    Join Date
    Dec 2001
    Location
    Southern Tier, NY
    Posts
    6,066
    mine ran in my cottage attic for 10 years with a heavily condensing flue ....

    you have some other problems

  6. #6
    Join Date
    Jun 2003
    Location
    New Hampshire
    Posts
    2,666
    It would be nice to know if it was sulfer build up or soot.
    Soot caused by not enough combustion air, dirty burners, natural gas boiler with propane hooked up, high altitude location with sea level burner orifices, improperly set up propane installation. The list goes on and on.

  7. #7
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,060
    We've got one (out of a dozen or more that we installed) giving us fits. Loves to trip the limit by the burners. We figure it is due to a poor venting system. Did have a lot of lint buildup that was easily brushed off. No sooting at all. Is this LP?

  8. #8
    Join Date
    Dec 2005
    Posts
    4

    more info

    Thanks for all the replies. The house is about 100 years old and still has the old cast iron rads and pipes. When I had the Teledyne put in 8 years ago, there was a new flu liner installed. Would I be right in saying that if there's a lot of carbon buildup (apart from the sulphar) that it's due to incomplete combustion??? I have an outside air vent leading directly onto the furnace and the exit hasses go right up the chimney. To avoid this with the purchase of a new furnace, what would I be best to ask a professional???

    Thanks for all the help.

    Cheers
    Grant

  9. #9
    Join Date
    Dec 2005
    Posts
    4

    extra info

    The burner is natural gas fed (Ontario - Enbridge) and it's at sea level. How would I check to see if there's bypass piping between suppy and return? When the unit has worked, the return is sufficiently warm.

    Cheers
    Grant

  10. #10
    Join Date
    Feb 2003
    Posts
    1,996
    Sufficently warm means at least 130°, I hope. Bypass piping would be a pipe between supply and return usually with a control ball valve.

  11. #11
    Join Date
    Dec 2005
    Posts
    1

    My experience

    I've had one in Toronto for 13 years with no excessive problems (replaced control after 9 years) but I clean the fins every 2 or three years. I have a similar installation: 85 year old house with heavey piping and large CI rads. I have a liner and a bypass valve.

    Once I let the deposits build up quite a bit on the fins but even then it didn't seem to effect the performance. I regularly get a good 'year to year change in consumption' vs 'year to year change in degree days' ratio and it was not different before ar after the major build up.

    I get a fair bit of ash falling from the vent hood, something I never noticed when I lived in Winnipeg and supposedly used the same natural gas from Alberta. Could the natural gas have changed that much or is it the differnce in the air that is burnt-more smog in the air in Toronto?

  12. #12
    Join Date
    Dec 2005
    Posts
    4

    the drama continues

    Well..... Folks might find this somewhat entertaining but I'v made progress with my boiler.

    I recalled last year that I both had a melted down electronics module on the unit (honeywell) and a blown fuse, I opened up the access panel and found the electronics package housing distorted. Worse yet, if I press against the electronics, the burner ignights....

    Any thoughts on this one???

    Cheers
    Grobinso

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event