Too Much Heat With My Coal Stoker

 
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BigBarney
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Post by BigBarney » Wed. Dec. 17, 2008 2:53 pm

I believe that mazzy's solution is correct,because the primary loop is not complete

without the connection of the supply and return to form the free flow loop.You

actually have a double loop one on the two boilers and a second on the pump

and dhw side.The addition of the supply line to the return would take the constant

pressure from the constantly running circulating pump off the check valves so they

would stay closed until the pumps start.

BigBarney

 
ART52
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Location: Jim Thorpe,Pa
Stoker Coal Boiler: Keystorker KA22
Coal Size/Type: rice

Post by ART52 » Wed. Dec. 17, 2008 3:24 pm

Hello coal berner
my 46 year-old E F M started with boiler leaks. I never did figure out why!
mostly around stay bolts or rods.. welded things up about the last five years of its life. then I got a flue leak. if I would have known that I could have gotten a new boiler I would still be running it,,, but so it gos.
I sold it to a local plumber and he used the good parts . :oops: :mad:

 
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ewstuart
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Location: Southern New Hampshire
Stoker Coal Boiler: AHS S130

Post by ewstuart » Wed. Dec. 17, 2008 3:43 pm

Hi Art52, I tried turning off the constant circulator and had problems with getting my hot water recovery rate to an acceptable level without some constant flow (did I mention I have 5 kids and they like their hot showers!)...I also experienced some disturbing puff-backs last time I tried this. I do have the oil boiler (backup) setpoint set to 140F so it should never come on when there is some circulation but it did just that when I wired the circ pump to energize with the coal fan.

I also have a 5.5KW generator for backup power, thankfully. Lucky thing too as you might have heard, we have had some really bad outages up here this week. I was out of power for 4 days and I'm one of the lucky ones. A lot of people in this area are still out of power.

I am going to connect the supply header to the return header with the same 1.25" line as many here have suggested. Thanks for all your help. Great Forum!


 
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beatle78
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Post by beatle78 » Wed. Dec. 17, 2008 3:57 pm

hmmm.... did you forget to draw in the circulator for the oil boiler?

If not, then with that complete loop I don't think you'll get any water through your oil boiler..... You're oil boiler will come on for no reason if my assumptions are correct b/c the temp will drop below 140F.

Basically you want the coal circulator to come on when the coal boiler is hot and the oil circulator to come on when it needs to supplement the coal boiler (aka it went out)

 
jmmazzy
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Post by jmmazzy » Wed. Dec. 17, 2008 5:13 pm

ewstuart. I want you to try something. It would be nice if you have a tempering valve on your dhw tank. Put everything back the way you showed on your drawing. Now take your TT terminals off your DHW tank and wire nut them together. THATS RIGHT DHW CIRC PUMP WILL RUN (primary loop get the idea) Get back to me.

Mazzy

 
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ewstuart
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Stoker Coal Boiler: AHS S130

Post by ewstuart » Wed. Dec. 17, 2008 5:24 pm

Hi Beatle78, no I don't have another circulator for the oil boiler. I used to have a Taco 007 at the oil boiler inlet but that fed all my zones while I had zone valves and no coal boiler. My heating guy told me that another circulator was unnecessary in this layout. I am thinking that I will still get flow through the oil boiler if I connect the supply hdr to the return hdr but not as much as I do now and I am hopeful that it will not cause the oil boiler to fire unnecessarily. If that does happen I will just put in a switch to keep the oil burner from energizing unless I want it to.


 
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ewstuart
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Stoker Coal Boiler: AHS S130

Post by ewstuart » Wed. Dec. 17, 2008 5:31 pm

Hi Mazzy, Yes I have a tempering valve on my indirect Superstore tank. But this tank is its own separate zone with its own circulator (1" piping supply & return)... are you asking me to connect the thermostat wires for that zone together so its always calling for heat? Thus keeping any excess flow from going to the other zones? (but this would keep 2 circulators on at all times.. the main and that zone) Am I understanding your intent?

 
jmmazzy
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Post by jmmazzy » Wed. Dec. 17, 2008 5:39 pm

That is exactily my intent. And if it works shut down the other circ., it should not affect the flow in your case. We are trying to make your DHW cir for the time being your primary loop pump. I think this will work. Get back to me. I'm leaving to see mom and will be back in a few hrs. Oh and by the way if you have DHW on priory shut it off. Gotta go talk later

Mazzy

 
jmmazzy
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Post by jmmazzy » Wed. Dec. 17, 2008 8:22 pm

stuart, mazzy here, did you try it?

Mazzy

 
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ewstuart
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Stoker Coal Boiler: AHS S130

Post by ewstuart » Thu. Dec. 18, 2008 12:01 am

Hi Mazzy, Yes I did try it and it does work. Before that I was throttling the outlet valve of the main circulator and that also seemed to work just as well. So I can go with either method this season. I think that longer term I will complete the primary loop as mentioned before but for now this is great. Thanks for all your help.

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