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Help with sludged ignitor

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josephny
josephny Member Posts: 270

I just bought a small house with a Miller/Nordyne CMF2-80-PO-CONV furnace with Beckett AF-15 oil burner.

The unit was working fine for the first couple of weeks and then stopped.

I troubleshooted oil flow and then took out the nozzle/ignitor assembly and found the nozzle, and the tube that the nozzle screws on to, covered in oil sludge.

I didn't have a new nozzle, so I cleaned everything as best I could with acetone, reassembled and now it works.

One thing I discovered is that there is no filter on the oil line. Nor is there a shut off valve on the oil line.

The tank is outdoors and underground and copper tubing (feed and return) run from tank to furnace.

Am I correct that those things would be smart to put in?

If so, what is the best way to set it up?

Should I use hard brass NPT threaded pipe out of the furnace to support the filter case, then a nipple to a valve, and then back to tubing?

What I'd really like is a valve that has NPT on 1 side and flare for tubing on the other (I don't have much experience with flairing).

Am I correct in my usage of NPT and flair?

Lastly, the current nozzle is a 60-80 (which, I believe, means 0.60gph and 80 degree spread). Should I replace with the same spec or different?

Thank you very much!

Comments

  • SuperTech
    SuperTech Member Posts: 2,186
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    Most mobile home oil furnaces are not equipped with an oil filter unfortunately.  The oil pump strainer is the only thing to protect the nozzle. I like to install a Tiger Loop Ultra on these furnaces.  It adds several benefits to keep the burner running right and the braided flexible oil lines make installation simple.  You will need to add a bypass plug into the oil pump. The Tiger Loop Ultra also includes a firomatic valve that can be used to shut off the oil to the burner, but a ball valve with flare connections is better for service use.
  • josephny
    josephny Member Posts: 270
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    Wow, the Tiger Loop Ultra looks great. But now I'm wondering where I could fit any filter inside this cabinet.







  • SuperTech
    SuperTech Member Posts: 2,186
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    I usually install them in the top left or right corner, above the burner.  On yours I would go with the left side near the power cord for the burner, more room there.
  • HVACNUT
    HVACNUT Member Posts: 5,861
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    Unfortunately there's no feasible way to do a combustion test on those furnaces without going on the roof, which I think is total BS. IMO, they should provide a test port.
    The nozzle needed should be listed on the door. They might list 2 firing rates. The pump strainer should also be replaced, and if using kerosene, the cause of the sludge should be found. 
    I've never had a sludge problem on a Miller firing kero without a filter. 
    SuperTech
  • josephny
    josephny Member Posts: 270
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    Wow, thank you guys so much for your help!

    I will order a Tiger Loop Ultra.

    Would anyone know exactly what to call the adapter from threaded valve (the one that comes with the Tiger) to copper flair?

    Looks like Beckett has a complete bundle (Tiger Loop, valve, hoses, filter, mount) -- S220-12

    Looks like I will need to cap off the current oil return line, right? Flair plug/cap?



  • josephny
    josephny Member Posts: 270
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    HVACNUT said:

    Unfortunately there's no feasible way to do a combustion test on those furnaces without going on the roof, which I think is total BS. IMO, they should provide a test port.
    The nozzle needed should be listed on the door. They might list 2 firing rates. The pump strainer should also be replaced, and if using kerosene, the cause of the sludge should be found. 
    I've never had a sludge problem on a Miller firing kero without a filter. 

    I searched and scoured and I don't see a pump strainer on the unit or in parts diagrams.

    I did find that the recommended nozzle is a 60-80A.

    I haven't put any kerosene in the oil tank.

    Are you suggesting that I don't need a filter?

    Thank you.
  • SuperTech
    SuperTech Member Posts: 2,186
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    Usually it's recommended to run kerosene on mobile home furnaces. It tends to be burn cleaner and is less prone to some of the issues that go with regular #2 fuel oil. However I have heard its a little more expensive.  You can cap off the return line if you go with the Tiger loop.  The strainer is a standard Suntec strainer for the A2VA-7116 oil pumps and Beckett clean cut pumps. I believe the adapter you are looking for is a 3/8" NPT x 3/8" flare adapter.  Sometimes I can clean up those pump strainers with a little carburetor or brake cleaner. If it's really sludged up just replace it.