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  1. #1
    Join Date
    Sep 2011
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    Weekend challenge - fun time

    Here is the scenario.... you have to make this boiler modulate and purge (to at least 100 degrees or less)for under $.

    The boiler pictured has a cold start control from the factory. GO!

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    You can use anything you want and modify anything you want as long as you stay at or below $. wholesale in parts.

    (if this isnt allowed please delete)
    Last edited by beenthere; 12-24-2012 at 05:48 AM. Reason: price

  2. #2
    Join Date
    Dec 2002
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    SouthEast NC ICW & Piedmont Foothills
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    7,635
    are you asking what is needed to accomplish your task?

    if so; you may be pushing the envelope of this open forum.
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  3. #3
    Join Date
    Sep 2011
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    Quote Originally Posted by dandyme View Post
    are you asking what is needed to accomplish your task?

    if so; you may be pushing the envelope of this open forum.
    Yes I am ...not my task... the task
    And ... Am I?
    (obviously not talking modulating fire rate)

  4. #4
    Join Date
    Sep 2011
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    50
    49 views and still nothing?. I assume that you are checking it twice and seeing what is naughty or nice?.

  5. #5
    Join Date
    Apr 2003
    Location
    Maple Grove, MN
    Posts
    1,297
    Call somebody else

    Seriously though, what do you mean by modulate and purge? Are you talking about a primary/secondary setup where the primary maintains a steady temperature while the secondary modulates somehow? Does purge mean an auto air vent? Is labor and piping materials included in your price? Does everything have to be automatic, or can we have some guy stand there operating manual "modulate" and "purge" valves?

  6. #6
    Join Date
    Oct 2011
    Location
    Chicagoland Area
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    Quote Originally Posted by ammoniadog View Post
    can we have some guy stand there operating manual "modulate" and "purge" valves?
    I'm up for the task
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

  7. #7
    Join Date
    Sep 2011
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    Quote Originally Posted by ammoniadog View Post
    Does everything have to be automatic, or can we have some guy stand there operating manual "modulate" and "purge" valves?
    LOL!~I scared the cat half to death with the snarf I made when I read this Beer all over the floor...which I have to clean up now


    Seriously though, what do you mean by modulate and purge? Are you talking about a primary/secondary setup where the primary maintains a steady temperature while the secondary modulates somehow? Does purge mean an auto air vent? Is labor and piping materials included in your price?
    Modulate the out going water at a set temp (lets say whatever you like between 140 and 180) and then purging the remaining water out of the boiler after the call is satisfied.
    Reason for doing this is to bring the boiler to temp fast without chilling the element or causing the boiler to shock and then getting all the water top side after the stat is satisfied, rather than losing it to standby.
    Material only

  8. #8
    Join Date
    Nov 2001
    Location
    Seattle, WA
    Posts
    7,763
    Place someone next to the boiler with his/her hand on the on/off switch and a thermometer & turn it on. When the thing, whatever your are measuring) reaches 110 degrees have that person turn off the on/off switch.
    "The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
    - Alexis de Toqueville, 1835

  9. #9
    Join Date
    Sep 2011
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    50
    The rest of you are just as funny... HAHAHA

  10. #10
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    68,095
    Weil McLain BCP 3. Its simple fast and easy.

    It will run the circ anytime the outdoor temp is below the heating point, and regulate boiler temp based on outdoor temp.

    Won't bring the water temp up fast, as what purging the boiler is counter productive to doing that.
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  11. #11
    Join Date
    Sep 2011
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    Quote Originally Posted by beenthere View Post
    Weil McLain BCP 3. Its simple fast and easy.

    It will run the circ anytime the outdoor temp is below the heating point, and regulate boiler temp based on outdoor temp.
    Looks like a Logomatic. Is it cheaper than the logomatic?.

  12. #12
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    68,095
    Quote Originally Posted by butternut View Post
    Looks like a Logomatic. Is it cheaper than the logomatic?.
    Don't know, don't know what a logomatic cost.


    And since this is an open forum, prices aren't allowed.
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  13. #13
    Join Date
    Feb 2004
    Location
    Pacific NW
    Posts
    567
    Merry Christmas all.

    Anytime pulse modulation is discussed I think voltage regulators as that was a big part of my previous day job. I

    In this case a TI UC1825 pulse width modulator chip, a few resistors and capacitors and thermistors and you have a state of the art control. Use the UC1825 to control the boiler on-off functions, and instead of the feedback circuit regulating on a voltage, use the thermistors as the control element. Since the 1825 is a current mode device, you can use that inner control loop for a continuous operation type control with the inner control loop running an inverter driving a variable speed pump. Thus burner almost never turns completely off, just the fuel and water flow are regulated in a pulse width modulation scheme.

    OP probably wanted something to buy off the shelf though, eh?, not a design tutorial?

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