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  1. #1
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    Nov 2004
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    it is quiet wierd problem. The york rooftop have two G775-RJD-1 Control intermittent pilot ignition module. THS and R1 all have 24 voltage. when I do the spark test, both module don't have spark. I replaced one of the them, the same problem.
    does anybody know what promblem? Does it has anything with the polority of the power?

    [Edited by comfortable air on 11-07-2005 at 06:47 PM]

  2. #2
    Join Date
    Sep 2002
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    Hampton Roads, Virginia
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    Check the grounding of both the module and the igniter
    The first rule of any technology used in a business is that automation applied to an efficient operation will magnify the efficiency. The second is that automation applied to an inefficient operation will magnify the inefficiency. - Bill Gates

  3. #3
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    Nov 2004
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    I checke the "5(ground)" to ground, it is good grounding. resistance is near 0. some of the module control sequence:
    1. the control circuit energizes the control module.
    2. Energizes the flame sensor and performs a safe-start check. (If false signal exists, it does not enrgize igniter)
    3. Energizes the igniter.
    Is it possible that the safe -start check found a exist false signal? how do we check whether it has false signal ?

    Does it has anything with the phasing? the book said, it need ensure proper grounding and phasing when the transformaer is connected to certain types of control modules.


    [Edited by comfortable air on 11-07-2005 at 09:08 PM]

  4. #4
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    Some Honeywell modules are sensitive to phasing, never heard of that being a problem with a Johnson module, but try reversing the secondary leads from the transformer, it should be easy enough to test.
    The first rule of any technology used in a business is that automation applied to an efficient operation will magnify the efficiency. The second is that automation applied to an inefficient operation will magnify the inefficiency. - Bill Gates

  5. #5
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    Nov 2004
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    I already reversed the secondary leads. nothing happened.

  6. #6
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    Nov 2004
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    I just wonder why the three control module couldn't spark. one could break down. it have no reason for three not working( one is new)

  7. #7
    Join Date
    Nov 2005
    Location
    Auburn Hills, MI
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    York/Johnson module

    Have you checked the roll out switch? I Think I had this problem a few years ago where the switch would not pass enough current through to get the module to operate, but would read voltage at the module. Try a jumper across the switch.

  8. #8
    Join Date
    Nov 2005
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    Auburn Hills, MI
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    But Make sure to remove that jumper!

  9. #9
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    Nov 2004
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    Mr. quest for fire, You remind me. The roll out leads in the module has 24 voltage. I have never suspect the rollout switch could not pass enough current through it. I will go back to change the new module tommorrow. I afraid there is other hide reason I did not fugure out

  10. #10
    Join Date
    Nov 2004
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    Thank you Mr.quest for fire. I went back to that rooftop. jumped the rollout switch, the ignitin work ok. It is unbelievable. if you did not speak of it, I will never thought of the rollout switch is defective. you see, it has 24 voltage at the R( rollout) lead.

  11. #11
    Join Date
    Nov 2005
    Location
    Auburn Hills, MI
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    Smile

    Glad I could help. That was a real head scratcher for me
    on a very cold day and also two modules later..

  12. #12
    Join Date
    Nov 2005
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    i replace any safetys with ohm reading higher than .10. preventative measures

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