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  1. #27
    Join Date
    May 2004
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    Salt Lake City/Tooele
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    2,457
    When the RTU has horizontal duct you have to remove the top panel and inner HX panel to get to the primary and secondary switches. Real PIA.

  2. #28
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    67,879
    Ask him if he found that sequencer inside the side discharge panel(back panel). If so he reset teh high limit, which will trip if you shut the disconnect off during a heat call with teh burner running.
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  3. #29
    Join Date
    Oct 2011
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    Chicagoland Area
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    Quote Originally Posted by beenthere View Post
    Ask him if he found that sequencer inside the side discharge panel(back panel). If so he reset teh high limit, which will trip if you shut the disconnect off during a heat call with teh burner running.
    You talking about the 3 wire limit correct?
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  4. #30
    Join Date
    Dec 2008
    Location
    Buffalo NY
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    3,081
    This was in the control panel with the contactors and relays. I know about the limit by the heat exchanger. That was the first thing I had suggested.


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  5. #31
    Join Date
    Jan 2004
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    Lancaster PA
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    Quote Originally Posted by 2sac View Post
    You talking about the 3 wire limit correct?
    yep.
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  6. #32
    Join Date
    Dec 2008
    Location
    Buffalo NY
    Posts
    3,081
    After looking at the wiring diagram I think he was talking about the ETD. Electronic Time Delay.


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  7. #33
    Join Date
    Oct 2011
    Location
    Chicagoland Area
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    4,565
    I reread the post. Sounds like the initial problem is/was the crossover tube and/or clogged pilot orifice and/or spiders nest. This is why he had to light with a torch. Does this unit have the blue Johnson Controls ignition modules? Those are designed to have multiple voltage inputs for them to fire. Even though you have 24v at TH, if any limits are open the inducer will run but you will not get spark.
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  8. #34
    Join Date
    Dec 2008
    Location
    Buffalo NY
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    Quote Originally Posted by 2sac View Post
    I reread the post. Sounds like the initial problem is/was the crossover tube and/or clogged pilot orifice and/or spiders nest. This is why he had to light with a torch. Does this unit have the blue Johnson Controls ignition modules? Those are designed to have multiple voltage inputs for them to fire. Even though you have 24v at TH, if any limits are open the inducer will run but you will not get spark.
    He said they were grey boxes which means they were replaced. I think those are UEI boxes?


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  9. #35
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    Oct 2011
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    Chicagoland Area
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    Not familiar with UEI the Honeywell universal is grey, and I thought JC did make grey boxes at some point in time but I could be wrong.
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  10. #36
    Join Date
    Dec 2008
    Location
    Buffalo NY
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    Quote Originally Posted by 2sac View Post
    Not familiar with UEI the Honeywell universal is grey, and I thought JC did make grey boxes at some point in time but I could be wrong.
    I have one in my truck. I will check tomorrow and let you know the make. I know it's the JCI replacement.


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  11. #37
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    Nov 2004
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    Call P&J !! we fix it the first time!!

  12. #38
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    Nov 2006
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    Southeastern Pa
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    The JCI replacement is the black UEI box.
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  13. #39
    Join Date
    Dec 2008
    Location
    Buffalo NY
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    Quote Originally Posted by valdelocc View Post
    Call P&J !! we fix it the first time!!
    That's funny this guy is from P&J and said he learned everything he knows from you. All kidding aside, I just wanted to get the kid some other thoughts on the issue since I knew I would probably not have time to go down and check out his issue. But he figured it out and learned a little from it.


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