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low water cut off problem

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Buster
Buster Member Posts: 36
in Strictly Steam
We have been called in to try to resolve the issue of the probe type secondary LWCO tripping (right side of unit). The situation happens just before or right after the unit cycles off on pressure. We are aware that the header is not correctly piped and it is getting resolved. Some other piping issues away from the boiler are also getting addressed. The water line does not go below the primary LWCO/feed control when the secondary trips....I have noticed that the equalizer does not get very hot more than about 12" down from the header.

All input would be greatly appreciated!

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  • adambnyc
    adambnyc Member Posts: 260
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    That LWCO is supposed to be on the boiler. It looks like it's sticking into the side of the Hartford loop. When you get the boiler repiped, get the surgeon to put the LWCO where it's supposed to be.
  • Buster
    Buster Member Posts: 36
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    LWCO is piped into the return to the boiler below the 'T'. It is a secondary, the primary is piped into the boiler. Why would its position be a problem? The pipe that it is in should always have water in it if the sight glass has water in it and the primary is not tripping.
  • Abracadabra
    Abracadabra Member Posts: 1,948
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    I see new piping. Was boiler skimmed?
  • KC_Jones
    KC_Jones Member Posts: 5,739
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    Buster said:

    The water line does not go below the primary LWCO/feed control when the secondary trips....

    What is the height of the secondary compared to the primary? Your wording implies they are at different heights.
    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
    Boiler pictures updated 2/21/15
  • Buster
    Buster Member Posts: 36
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    Secondary is 1.5" lower than the primary which puts it .5" above the bottom sight glass nut.
  • Buster
    Buster Member Posts: 36
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    Unit did get skimmed. We dont get any evidence of surging either
  • New England SteamWorks
    New England SteamWorks Member Posts: 1,507
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    You are going to have surging in that equalizer so it's a terrible place for a LWC. Move it to the boiler and fix the near boiler piping to manufacturers specs and you should be fine.
    New England SteamWorks
    Service, Installation, & Restoration of Steam Heating Systems
    newenglandsteamworks.com
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,574
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    Terrible location for the low water cut off.

    Also, get rid of the gastight tyrapped to the water heater gas pipe.

    That is bad news
  • Buster
    Buster Member Posts: 36
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    Update, Header has been re-piped and LWCO moved to the boiler. Unit is running much better.

    Thanks for the input!
  • Danny Scully
    Danny Scully Member Posts: 1,426
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    Come on @Buster! We're all suckers for pictures :wink:
    RomanGK_26986764589

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