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Question for Timmie or Bill W.

Bill from Honeywell. I also find that an R7795B could be used. I am getting this from the modernization section of the Honeywell Firing Line.

Comments

  • Steve Ebels
    Steve Ebels Member Posts: 904
    Question for Timmie or Bill W.

    Honeywell RA890F-1031 flame safety control on a 1964 Crane boiler with dual standing pilot. The operating relay will not pull in automatically, however if you manually give it a push it will lock in and stay in by itself until the aquastat is satisfied. At that point it will drop out the relay as normal but then will not pull in on the next call for heat. I'm thinking the pull in coil is toast. What is the replacement for this thing and/or is there any "fix" for it?

    Thanks
  • Alan R. Mercurio
    Alan R. Mercurio Member Posts: 588
    Sticking my nose in :)

    Steve, hope you don't mind me jumping in on this one but I found some data that may be useful to you.

    RA890F-1031

    Your friend in the industry,
    Alan R. Mercurio

    Oil Tech Talk
  • BillW@honeywell
    BillW@honeywell Member Posts: 1,099
    Hi, Steve!

    I hope you remembered where you you put your winter coat last spring! It's a bit chilly here, too. Possible frost Thursday night into Friday AM here in Joisey. The RA890F-1031 is one of our commercial FlameSafeguard boiler controls. It is obsolete, and has been replaced by the R4795A1016 programmer, R7289A1004 plug-in amplifier, and the ST71A1000 7 second delay (oil) timer. Other timers for 10,30,60,90 second purges are available. You can recycle the existing rectification detector, if it's in good shape. You'll need to find an authorized Honeywell FlameSafeguard distributor, this is a restricted product. Have them double-check the application for you, to make sure it is right.
  • Steve, Bill gave you

    the answer. Just one more thing I suggest pulling the pilots and cleaning them when all of this is done. I would replace the rectifiers as long as you are going to all this trouble.
  • Steve Ebels
    Steve Ebels Member Posts: 904
    Just got off the phone

    With the Honeywell distributor in Grand Rapids. They told me the replacement now is an RA7890 series. Is this right?
  • BillW@honeywell
    BillW@honeywell Member Posts: 1,099
    Re-check that part number...

    I think they mean an RM7890 of some variety, I couldn't find a listing with the RA number. The control is described as a on-off primary for gas, oil or combo single burners. The FlameSafeguard products are handled by specialists here in Honeywell, and I am not one of them. This may well replace the items I mentioned earlier, but ask the distributor to have their Flame Safeguard rep get in touch with you, or find out who he/she is, and I'll get them to give you a call or email. Sorry I couldn't give you a more definitive answer.
  • Dale
    Dale Member Posts: 1,317
    The key question

    What is your flame sense current? If it's 2 or more microamps it's time for a new RA 890. I'm sure you checked all the normal input voltage. Most good wholesalers have the honeywell test jig, the fsp1535, and most will give you a free copy of the excellent ra890 and r4795 service book.
  • Steve Ebels
    Steve Ebels Member Posts: 904
    Flame current

    Is 4 uA so I don't think that's the problem. The old bugger (origional part from 1964) just doesn't have the gumption to suck in the relay anymore.

    Bill you are right. It's RM not RA. my bad The RM7890-1015 they are sending is supposedly the latest version of flame safegaurds for that type of burner. It is not a direct bolt-in replacement and will require some rewiring. They've already sent me a fax on it.

    I should be all set. Thanks for the help as always
This discussion has been closed.