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  1. #1
    Join Date
    Sep 2003
    Location
    NJ
    Posts
    127

    Mcquay rooftop unit

    Had to check a mcquay rooftop unit model RPS, tries to start and goes out on flame failure. The maintenance guy says that it will only fire if he cover the inducer fan intake, anyone ever run into this, could it be a problem with the pilot tube?

  2. #2
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,627
    Pull the burner assembly. Could be pilot orifice, crossover tube, rotted brackets or a combination. Also could be a restrictor plate rotted out by the inducer.
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

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  3. #3
    Join Date
    Mar 2011
    Location
    North Carolina Piedmont Area
    Posts
    449
    You definitely want to check main gas pressure first. If a pressure regulator is used for medium pressure gas, verify that it is not locking up and on start up not opening completely. For this you will need a manometer.

    After that verify that manifold gas pressure is correct based on design.

    ________________________________________
    Trouble shooting is not part of the repair......understand the symptoms and you will find a solution.

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