Rheem RKKB-A180 wont fire
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  1. #1
    Join Date
    Nov 2005
    Location
    Chicago
    Posts
    219

    Rheem RKKB-A180 wont fire

    Model RKKB-A180CL35E Ser 2D6606ADAAF2302118777 3 draft inducers on this unit. Tech support at local counter says all motors would be calling at once on call for heat ( not sure about that). From left to right , motor one bad (240v to motor no operation) motor 2 ON at call for heat motor runs 240 volts, motor 3 no operation 65 volts. Checked the board which has Hi/lo called for heat in both stages and I get 240 volt at Lo terminal and 80 volt at Hi terminal. I neeed a IOM and schematic for this unit. Are all 3 Motors calling on 2 stage demand or is it firing in low for X mins then to Hi with 2 motors then to 3? need IOM and schematic. My objective is to determine if I have a bad relay on the board which feeds the #3 motor... This motor is good jumped out to confirm.
    Bonus question ... anyone know what size filters for this unit?
    The Difference between Genuis and Stupidity is Genuis has it's limitations.
    Chicago Furnace Repair

  2. #2
    Join Date
    Nov 2005
    Location
    Chicago
    Posts
    219

    Rheem data

    Can anyone direct me to sequence of oreration sheet on this RKKB perhaps a tech support # other than the local hung over counter guy?
    The Difference between Genuis and Stupidity is Genuis has it's limitations.
    Chicago Furnace Repair

  3. #3
    Join Date
    Nov 2008
    Location
    some freezing metal shed somewheres
    Posts
    28
    what like this page 5?

    it looks like your failed motor has to make a draft switch before it goes into first stage of heat.

  4. #4
    Join Date
    Nov 2005
    Location
    Chicago
    Posts
    219

    Exactly

    This is perfect. do you happen to have a schmatic. I need to determine where the warp switch is to initiate the relay for the 3rd draft inducer. It's only getting 65 volts at he motor and 80 volts of the hi fire connection at the board.
    The Difference between Genuis and Stupidity is Genuis has it's limitations.
    Chicago Furnace Repair

  5. #5
    Join Date
    Nov 2005
    Location
    Chicago
    Posts
    219
    Quote Originally Posted by automig View Post
    what like this page 5?

    it looks like your failed motor has to make a draft switch before it goes into first stage of heat.
    OPERATING SEQUENCE
    This unit is equipped with a two stage
    integrated direct spark ignition control.
    NORMAL HEAT MODE
    A. Call For First Stage (low fire) Only:
    1. Zone thermostat contacts close, a
    call for first stage (low fire) heat is
    initiated.
    2. Control runs self check.
    3. Control checks the high-limit switch
    for normally closed contacts, each
    pressure switch for normally open
    contacts, and all flame rollout
    switches for continuity.
    4. Control energizes each inducer.
    5. Control checks each pressure switch
    for closure.
    6. If each pressure switch is closed, the
    control starts a 30 second prepurge

    Now I need to determine why I only have 65 volts at motor #3 and 80 volts at the Hi terminal on the board. Thanks again for the info. I,m Thinking it a bad board relay.
    The Difference between Genuis and Stupidity is Genuis has it's limitations.
    Chicago Furnace Repair

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