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back flow preventer on steam boiler

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nycpa
nycpa Member Posts: 108
in Strictly Steam
I have a VXT auto water feeder to my weil steam boiler.  Does anyone know if the VXT has a built in backflow preventer in it?  If not, other than the actual backflow prevent er valv, does anything else need to be installed?  Thanks

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  • Dave in QCA
    Dave in QCA Member Posts: 1,806
    Depends

    It depends on your locality and what is now being required. A couple years ago I had to install a "testable" double check back flow preventer. It has to be tested each year and a report sent to the water company.
    Dave in Quad Cities, America
    Weil-McLain 680 with Riello 2-stage burner, December 2012. Firing rate=375MBH Low, 690MBH Hi.
    System = Early Dunham 2-pipe Vacuo-Vapor (inlet and outlet both at bottom of radiators) Traps are Dunham #2 rebuilt w. Barnes-Jones Cage Units, Dunham-Bush 1E, Mepco 1E, and Armstrong TS-2. All valves haveTunstall orifices sized at 8 oz.
    Current connected load EDR= 1,259 sq ft, Original system EDR = 2,100 sq ft Vaporstat, 13 oz cutout, 4 oz cutin - Temp. control Tekmar 279.
    http://grandviewdavenport.com
  • steveray
    steveray Member Posts: 11
    check valve

    you are required to put a swing check valve and a ball valve between the water feed and the boiler . you should also put a union between the feed and the check valve so you can check that it isn't passing in the event of a flooded boiler. A backflow preventer is required between the feed and the potable water source.
  • vaporvac
    vaporvac Member Posts: 1,520
    Manual feed?

    Does one need a back flow preventer with a manual feed?
    Two-pipe Trane vaporvacuum system; 1466 edr
    Twinned, staged Slantfin TR50s piped into 4" header with Riello G400 burners; 240K lead, 200K lag Btus. Controlled by Taco Relay and Honeywell RTH6580WF
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