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  1. #14
    Join Date
    Jul 2018
    Location
    Wisconsin
    Posts
    992
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    Could a boiler staging control with reset be used? Tekmar maybe.

    Sent from my SM-G960U using Tapatalk

  2. #15
    Join Date
    Mar 2019
    Posts
    13
    Post Likes
    Why dont you call the expert technician and ask for the help?

  3. #16
    Join Date
    May 2018
    Location
    VA/DC
    Posts
    250
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    A staging control would be best. no need for two to run if the load doesn't need it. Boilers do like to run longer then shorter. The flue likes it also. Get past the condensing stage.
    A big part of efficiency loss is the start up time.

    with staging if one fails the other will kick in.

    Now staging and its efficiency does change with piping. is it pump through or primary secondary. if PS are there check valves?

  4. #17
    Join Date
    Jun 2011
    Location
    Pulaski, NY
    Posts
    30
    Post Likes
    Your customer would certainly see efficiency benefits with staging the boilers. This could be done with a boiler lead/lag controller or could be set up with varying set points where the lag boiler would start only if the lead boiler fails to keep up with the demand or goes into a fault. Also, depending on the model and burner control, it could be something as simple as relay logic that would start the lag boiler when needed.

  5. #18
    Join Date
    Aug 2019
    Location
    Central Florida
    Posts
    71
    Post Likes
    Whats the pumping situation? 2 pumps ? 1 pump ? If 2 pumps are both running all the time?

  6. #19
    Join Date
    Aug 2002
    Location
    Cincinnati, Ohio
    Posts
    3,018
    Post Likes
    Piping and pumping have a lot to do with how the boilers should run. If water is circulating through an idle boiler it will become a cooling chamber and increase fuel usage. The differential should be 20 degrees not 10 degrees! This will increase run time.

    Fuel usage is dependent on how the boilers are set up more than just cycling. If they are modulating or High-Low, operating both of them in Low fire can be costly, unless they are condensing boilers. Knowing the combustion numbers of both boilers is critical in proper operation. In reality, the longer a boiler operates, the lower the efficiency. Basic heat transfer rules. The hotter the heat exchanger the less heat it absorbs from the burner. Ever notice the flue temperature keeps getting higher the longer things run? Short cycling only causes excess wear if the burners are set up incorrectly. Most equipment is oversized most of the year. Messing with the firing rates to create longer cycles increases energy use. Control settings (differential) is the only correct way to minimize cycling.

    Laziness should never be a reason to operate equipment incorrectly. Stand-by equipment needs to be valves off if not used. Otherwise it should operate normally.
    captain CO

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