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Thread: York Rooftop

  1. #1
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    York Rooftop

    Hi All,

    I have a customer with a york rooftop unit aka the worst units out there for heating i find with there stupid pilot/runner tube setup from the 19th century

    So if your familiar with these units you know the newer ones have the board with diagnostic codes. Old ones are just a blue fenwal ign box. This one is the beige CPU board with codes

    Replaced a burner out inducer and went to light it up, seems like its taking 20/30 seconds to light pilot. I am assuming the runner or pilot is clogged And have recommended those parts. I had no choice but to leave the heat on for them for the weekend and didnt have time to try and clean tube. Another tech told me that these style boards take longer to light... any ideas?

  2. #2
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    whats going on for these 20 seconds ?

    Are you saying you can hear the gas valve click , and it takes 20 seconds before the gas comes through ? Like its slow opening ?

  3. #3
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    First, model and serial.

    Second, the inducer has a 30 second pre-purge.

    Third, the former ignition modules were JCI. We call them "the blue box of death."

    Fenwal was used on Lennox and Trane.

    The pilot tube with the long rows of holes is the "crossover tube."

    When this design was produced, the thinking was the spark ignited pilot with crossover and flame detection was an added margin of safety.
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  4. #4
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    Thread Starter
    Its sparking and can smell faint gas. Usually its only 5 second spark then lights up

  5. #5
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    check gas pressure

  6. #6
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    Thread Starter
    Quote Originally Posted by timebuilder View Post
    First, model and serial.

    Second, the inducer has a 30 second pre-purge.

    Third, the former ignition modules were JCI. We call them "the blue box of death."

    Fenwal was used on Lennox and Trane.

    The pilot tube with the long rows of holes is the "crossover tube."

    When this design was produced, the thinking was the spark ignited pilot with crossover and flame detection was an added margin of safety.

    I did mention runner tube thats what my local masters supply calls it OR pilot tube. The unit is giving a constant spark and attempting to light pilot but takes about 20-30 seconds.

    M# ZF060N10N5AAA2A
    S# N1G2023254

  7. #7
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    Thread Starter
    Quote Originally Posted by Snapperhead View Post
    whats going on for these 20 seconds ?

    Are you saying you can hear the gas valve click , and it takes 20 seconds before the gas comes through ? Like its slow opening ?
    Almost seems like its taking a while to reach the flame sensor along crossover tube

  8. #8
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    That might have the stupid hidden orifice as it enters the pilot tube

    Might check the orifice for dust .... probly not , but you can look ... but I would make sure the Gas Pressure is ok first

  9. #9
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    Yup, clean the pilot orifice. Pretty standard on these turds.

  10. #10
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    So this is a predator unit.
    What control board? 1A? SSE?
    I shouldn’t have to advise anyone, but check the heat exchanger. Should be one of the first steps when walking up to one of these.
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  11. #11
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    The supply house can call it whatever they like. However, it IS a crossover tube.

    As suggested above, start by making sure the orifice is open, and that inlet gas pressure is well within label pressure range. If the tube is clear, and lights slowly, with good inlet pressure, it is very likely a gas valve issue.

    I am hard pressed to believe that a 2012 unit already needs a gas valve, but testing and examination could prove me wrong.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

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