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  1. #1
    Join Date
    Mar 2013
    Location
    columbus, ohio
    Posts
    14

    Trane voyager spark no ignition

    Hey folks, I'm new to the forum. Told a buddy i had a problem and he said to come here. I'm working on a Lp Trane GRAA 350000 btu rooftop. Got a call after the propane tank was refilled because the unit failed to light. Purged the gas train and still got nothing. Checked for spark and had a bright one. The gas valve manometer port was striped so I changed it out (Honeywell single stage standard opening). Changed pilot assembly while I was at it just in case. Gas pressure was 10.8 in. Only thing I can think of is bad mix but I've tried a range of pressures. Does anyone have any ideas?

  2. #2
    Join Date
    Feb 2013
    Location
    Lamar, SC
    Posts
    504
    checked for 24v to valve? was the 10.8 in WC the inlet or outlet?

  3. #3
    Join Date
    Mar 2011
    Location
    North Carolina Piedmont Area
    Posts
    449
    Are you sure that is a spark ignition and not a hot surface ignition.
    What is the Model No. and Serial no.
    Is that a two stage gas valve.
    Did you say that you replaced the gas valve and if so was that an O.E.M. parts replacement.
    You have to be careful because sometimes those valves are rated for negative manifold pressure.
    Are the controls Microtech

  4. #4
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,267
    he mentioned that the unit is a GRAA which is a make up air unit originally designed by Sterling. it is a spark pilot ignition. as mentioned before, you measured the gas pressure where? the inlet gas pressure is important, but with no fire, the outlet is important too...got gas coming out of the pilot?
    my 1st time jumping out of a plane...http://youtu.be/Kv38G0MHsGo

  5. #5
    Join Date
    Mar 2013
    Location
    columbus, ohio
    Posts
    14
    Thanks for the responses. I have 24v to gas valve and pressure was measured going in. Adjusted pressure but haven't measured the pressures out yet. Pilot valve has gas coming out but won't light from the spark. I replaced the valve that with the same single stage Honeywell that was on it. On my way to the job site now so ill keep you posted.

  6. #6
    Join Date
    Mar 2013
    Location
    columbus, ohio
    Posts
    14
    Pilot assembly*

  7. #7
    Join Date
    Mar 2013
    Location
    columbus, ohio
    Posts
    14
    Also the pilot assembly was not a LP so I changed the orafice. I assumed they where all the same but this could very well be the problem.

  8. #8
    Join Date
    Sep 2006
    Location
    Ohio
    Posts
    456
    Is this a Direct or Indirect fired MAU?

  9. #9
    Join Date
    Mar 2013
    Location
    columbus, ohio
    Posts
    14
    Indirect. But I managed to figure it out. The pilot assembly was not putting out the proper amount of gas becouse I used the wrong nozzle when I converted it to propane. Whould have been nice to just get the right assembly the first time but it was 2 weeks out. Switched out the nozzle abd cleaned out a ton of soot from the burners and she fired up. Original pilot assembly was clogged up bad too. Thought it was wierd for a 4 year old unit but it sits unused most of the time.

  10. #10
    Join Date
    Nov 2004
    Location
    up in the hizzy
    Posts
    1,375
    Great! glad you didnt have to call a HVAC contractor, they are expensive you know.

  11. #11
    Join Date
    Mar 2013
    Location
    columbus, ohio
    Posts
    14
    Contractor=My boss I'm in training in a family business.

  12. #12
    Join Date
    May 2000
    Location
    Salem, WI US
    Posts
    61
    Good job........

    Beta

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