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  1. #1
    Join Date
    Mar 2009
    Posts
    19

    Rheem 90 plus, heat exchanger problem

    I have a Rheem 90+ M# RGTA09EZAJ5 that is in horizontal config, (evap to the left as you look inducer mtr. Problem is a lazy flame on bottom burner, almost as if heat exchanger port is blocked and forcing rollout condition. Heat exchanger is clear at least to 1st pass. Manifold gas pres 3.5"w.c.
    Any ideas?
    This is an large home with three furnaces, that is unoccupied and gas was turned off. No damage to other units, I was told that the horizontal config of furnace is ok as is, by local Rheem rep.

    This unit is located in an attic pushed up to roof rafters (Conditioned space)and has a supply line run across the top of unit, very, very tight! Really want to open cabinet up and see if anything shows!

    Need some help with this one, more of a commercial guy! Out of my league! Thanks in advance!

  2. #2
    Join Date
    Apr 2005
    Posts
    480
    when was the last time burners were pulled and cleaned?
    Jason J Saylor
    Pinellas County Schools
    HVAC Tech/Part Time HVAC Instructor Fortis College
    Pinellas County Florida

    "You will encounter many distractions and many temptations to put your goals aside: The security of a job, a wife who wants kids, Whatever. But if you hang in there, always following your vision, I have no doubt you will succeed.
    Larry Flynt quote

  3. #3
    Join Date
    Sep 2002
    Location
    Northeast Ohio
    Posts
    4,842
    You won't get any technical advice here in the open forums. Get a few more posts up and apply for pro member status. Realize this won't help you short term but it will with the next problem
    A good HVAC tech knows how, an educated HVAC tech knows why!

    DEM


  4. #4
    Join Date
    Mar 2009
    Posts
    19
    I pulled the burner rack and inspected when I check out heat exchanger. They are in good shape. furnace can't be more than 2 years old max!

    Thanks for the advice on the posts!

  5. #5
    Join Date
    Mar 2009
    Posts
    19
    Got it fixed! Local Rheem rep found a technical bulletin dealing with exact issue that I was dealing with. Found a pass on secondary heat exchanger plugged with crap. They never ran oa intake, using house air. House had a lot of construction.

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