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  1. #1
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    Mar 2005
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    York RTU heat problem

    I was working on York RTU DCVC-T090N205G. Found bad infuser motor. Replaced with new, Got unit started. Motor starts , pilot coil on a valve energize, igniter sparks, flame would not lite. Checked pressure on pilot outlet, have plenty of pressure, smell gas , no fire. Tried to blow out pilot tube, reposition igniter. Nothing works. The only thing that I can think of is clogged pilot tube outlets. What do you think guys?

  2. #2
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    Sep 2007
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    Verify pilot gas flow out of the valve, then check pilot orifice, only thing left is the big ass spider nest in the pilot burner.
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  3. #3
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    Dec 2004
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    A few things.

    Most likely something inside the pilot runner.

    Remove and clean mechanically, and riffle a wire in and out of it.

    The other is the air inlet for the pilot may be blocked off partially.

    Also, clean the ignitor and sensor, and the burners themselves.






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  4. #4
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    Thread Starter
    There is good pressure out of pilot outlet on a valve. Anyone has service manuals for these machines?


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  5. #5
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    Aug 2015
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    Quote Originally Posted by uke View Post
    There is good pressure out of pilot outlet on a valve. Anyone has service manuals for these machines?


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    Dose this unit have a spreader bar on it? Have you cleaned it? Checked the office?


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  6. #6
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    Mar 2005
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    Thread Starter
    Got dark pretty quick on me. Didn’t have time.
    Pilot tube is two part. It runs from valve inward into burner section, where turns left along the bottom where connection is with orifice and air intake. After that it continues all the way to the left side and up into burners are. Runs alongside in front of burners with multiple openings and ends by the igniter. I guess that what you called a spreader bar. I wonder if it is easier just to replace it? Looks like less labor involved.
    Any manuals? Thanks for replies.


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  7. #7
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    Jan 2010
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    That aluminum pilot tubing could be cracked somewhere. I've actually used foil tape to warp the crack in a pinch.

  8. #8
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    Thread Starter
    I didn’t see any cracks, but again I couldn’t see entire length of the tubing. To tell for sure need to take burner apart and pull out the tube, but if something got deep inside the tubing it will be hard to tell even with entire tube out. That’s why I’m thinking about replacing it.


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  9. #9
    Join Date
    Nov 2006
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    When I have a York with a crossover tube ignition, I write it up to rebuild the entire section. I replace the gas valve, all the crossover tubing, and the orifice. I clean the burners and I replace the ignition module.

    It is not worth it to try and dig through this step by step, because it is such a unreliable design.

    If the unit is more than 10 years old, I replace the rollout switch and both the primary and secondary safety switches as well.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

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  11. #10
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    Mar 2005
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    Thread Starter
    Unfortunately rebuilding this unit is not an option right now. I have to get it running. If heat fails again within a year, when I can convince them to rebuild. Unit is over 15. If problems continues I probably try to replace it..


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  12. #11
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    Nov 2006
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    In that case.... make sure that the ignition module is sending out the proper signals for pilot and main gas valve operation, remove the tubing between the crossover tube and the gas valve and make sure that it is clean with no spider webs, and make sure that the flame sense rod is clean and in the proper position....with no breaks in the porcelain for either the ignition or the flame sensor rod....and if I were you, I would also be replacing those flame sensor and ignition electrode parts as well.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

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  13. #12
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    Nov 2006
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    If you want to reuse the high-voltage cable, then attach an ignition gap tester to the end of the cable and make sure that you're getting a good strong spark at the end of that cable.

    Lisle 50850.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

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  14. #13
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    At the very least, the entire burner rack needs to be removed for cleaning.

    Manuals will not help with the task.

    I typically use the same approach as Timebuilder.

    In fact I think its a universal standard procedure for those that have worked on York units with any frequency.

    However, the oriface I typically keep, they dont go bad.

    Also, how on earth do you know the gas to the pilot is adequate?




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