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Author Topic: Solutions for heat bleedoff  (Read 4980 times)

RSI

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Re: Solutions for heat bleedoff
« Reply #15 on: June 19, 2018, 06:43:02 PM »

170 or a little lower should be fine. If it starts building up more creosote than usual then I would go back up it temp.
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wreckit87

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Re: Solutions for heat bleedoff
« Reply #16 on: June 20, 2018, 07:32:48 AM »

All depends on pump size and delta T when talking temp. Depending on HX size and piping layout, DHW call may be a huge load. Condensation doesn't start occurring until ~132 degree return temps, so if there is good mixing in the stove and a proper piping system, you should be able to run down to 165 with a 10 degree diff or 160 with a 5 degree diff- possibly even lower if creosote doesn't become a problem. Even in the -40F dead of winter I still run a 165 supply with 10 degree diff, and a full load of heating and DHW hangs about a 17 degree delta T. Personally I don't understand the idea of burning year round and needing to have a heat dump when the wear and tear on my shoes walking to the stove twice a day costs more than heating DHW with LP, but that's just me and my small DHW load. Last time I filled my 500 gallon LP tank was in April 2015 and it's down to about 15% right now- a 3 person household has cost me ~$10/mo to heat water as well as the house during shoulder seasons, I can't afford to light a fire for that
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E Yoder

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Re: Solutions for heat bleedoff
« Reply #17 on: June 20, 2018, 11:35:24 AM »

I've burned 10 summers with no heat dump with no overheating issues that I can remember. Various models. Running either 170 (conventional) or 175-180 (gasser) on the high end. But they've gotta shut down tight.
I like playing with a fire anyway, but now with 4 children it's definitely worth burning year round. But not everyone is in my situation. We roll through hot water, a flat plate is a wonderful thing.
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greasemonkoid

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Re: Solutions for heat bleedoff
« Reply #18 on: June 20, 2018, 05:07:54 PM »

There is creosote running down the inside of the door, all inside really. Every few days I turn the water on and do a long burn. Depending on what the power bill looks like I may shut it down, but it sure is nice to have the water hot for a change. With 3 females in the house at 45 minutes a pop in the shower I would expect to see something change. Reminding myself I don't have to hurry in shower is a change of pace...


Nothing spectacular here, looks like someone was running the washer, shower or somehting a 10am this morning. The DHW circ pump doesn't seem to show up on the graph, it is set to 155*. The T-stat is set at 180 with a 10 degree diff, I think the logger reads 2* high.


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greasemonkoid

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Re: Solutions for heat bleedoff
« Reply #19 on: June 25, 2018, 05:57:04 PM »

Ok, yes, I'm a paranoid geek.



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E Yoder

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Re: Solutions for heat bleedoff
« Reply #20 on: June 25, 2018, 07:13:32 PM »

What is it in the picture?
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RSI

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Re: Solutions for heat bleedoff
« Reply #21 on: June 25, 2018, 08:04:06 PM »

What is it in the picture?
Lol, has me scratching my head too.
There is an Asco solenoid valve that looks like it goes to a tee with a sensor in the end and a pipe going out through the wall. I am guessing it is a bare pipe buried in the ground back to the boiler to bleed heat into the ground.

I wonder how close my guess is.  ;D
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greasemonkoid

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Re: Solutions for heat bleedoff
« Reply #22 on: June 25, 2018, 09:30:02 PM »

Neat idea. ^

That line is tee'd off of a hot water line after it passes through the DHW heat exchanger. Hot water squirts out the side of the house when overheat occurs, it is very aggressive and effective at pulling heat out of the boiler.


The sensor is part of the Control by Web. Sensors are cheap, figured why not.
« Last Edit: June 25, 2018, 09:33:03 PM by greasemonkoid »
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E Yoder

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Re: Solutions for heat bleedoff
« Reply #23 on: June 26, 2018, 06:30:55 AM »

Yup, that would work. Cold well water would put a good load on like you said. :)
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