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Steam Boiler Controls - not sure what they do

elfie
elfie Member Posts: 266
in Strictly Steam
here are the various pressure/burner controls on top of a 14 section steam boiler



the one on the right cuts off the boiler when boiler pressure gets too high



the other two on the left are confusing to me

why are both controls needed? and what does each one do (ie. burner level, cutin, cutoff)

do they look like they are piped correctly (ie. dont see a siphon connection)



thanks

Comments

  • Motty
    Motty Member Posts: 8
    controls

    Need more pictures..... Those are all pressuretrols... if you can provide the model numbers that may help in discovering the functions...
  • Dave in QCA
    Dave in QCA Member Posts: 1,788
    Impossible to tell

    But, Here is a likely explanation for what they are.  You will have to verify yourself.

    You have indicated that the one on the right is the operating pressuretrol.  The gray device located just to the left of it is probably a high limit pressuretrol.  The purpose is to provie a back up in case the main pressuretrol fails.  May places require that the secondary is a manual reset, but many places to not.  If it is the secondary device, it will have a slightly higher setting.  The device to the far left is a modulating pressuretrol.  Its purpose is to control a modulating burner. 
    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
  • Dave in QCA
    Dave in QCA Member Posts: 1,788
    No Pigtail, but.....

    The piping is arranged so that steam cannot get to these devices.  The low piping that the devices are connected to will fill with water.  That is what you want. 
    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
  • Abracadabra
    Abracadabra Member Posts: 1,948
    "Missing" pigtail

    Yep.  That's the arrangement that Weil-McClain recommends for the LGBs, instead of a pigtail.
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