Is high temp normal in aa 130

Is high temp normal in aa 130

PostBy: franksnbeans On: Tue Apr 08, 2014 9:24 am

Success in installing my AA 130! all bugs seem to be worked out.

My question I have is my temp is set at 190 degrees high 170 low. There is not much load during the day and after boiler finishes running after a load to heat house.... The temp keeps rising to about 218 before the fire dies enough to stabilize.

My high temp switch is at 200. So the timer doesnt come on. My concern is high temperature and also if the timer doesnt come on for a few hours will my fire go out? In the summer I plan on lowering my temperature to 160 high. But right now still needing heat I need 180. But not much load to keep temperature in check.

So is this normal?

Thanks for any advice. Learning everday
franksnbeans
 
Stoker Coal Boiler: AA 130
Coal Size/Type: Pea

Re: Is high temp normal in aa 130

PostBy: Carbon12 On: Tue Apr 08, 2014 9:37 am

With the moderating temperatures, do you still need to run the temps so high? I'd try 160/180 and see how that responds.
Carbon12
 
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice/Anthracite
Other Heating: Heat Pump/Forced Hot Air Oil Furnace

Re: Is high temp normal in aa 130

PostBy: franksnbeans On: Tue Apr 08, 2014 9:52 am

I suppose so. I do plan on lowering the temp. I think the system is running ok . Wondering if its normal to run 30 degrees over after boiler shuts off. But yes I'll try lowering temp
franksnbeans
 
Stoker Coal Boiler: AA 130
Coal Size/Type: Pea

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Re: Is high temp normal in aa 130

PostBy: Rick 386 On: Tue Apr 08, 2014 9:53 am

franksnbeans wrote:
So is this normal?

Thanks for any advice. Learning everday



Yep pretty much normal. Remember this. The boiler fan is running and it is feeding coal to get it up to temp. Then when the temp is reached, it just shuts off the fan. That coal that was getting up to temp, will still keep burning after the fan shuts off. The rise in temp is called overshoot and is quite normal.

As C12 stated, you may be able to turn back the temp now already. This will only cause the boiler to work just a little harder to get up to temp. That's all.

As far as it going out....... after I turn off my AA 260, the fire will still be burning 2 days later. Your 130 would probably go 24 hours before needing the fan to kick back on with the timer.




Rick
Rick 386
 
Stoker Coal Boiler: AA 260 heating both sides of twin farmhouse
Hot Air Coal Stoker Stove: LL Hyfire II w/ coaltrol in garage
Coal Size/Type: Pea in AA 260, Rice in LL Hyfire II
Other Heating: Gas fired infared at work

Re: Is high temp normal in aa 130

PostBy: lsayre On: Tue Apr 08, 2014 11:35 am

What you are describing is normal for my similar AHS S130 Coal Gun boiler. I agree with backing down the temperature by at least 10 degrees.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Stockton Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)

Re: Is high temp normal in aa 130

PostBy: Sting On: Tue Apr 08, 2014 1:25 pm

Keep your boiler above condensing temperature

http://www.google.com/url?sa=t&rct=j&q= ... 7178,d.b2I
Sting
 
Other Heating: OBSO Lennox Pulse "Air Scorcher" burning NG

Re: Is high temp normal in aa 130

PostBy: franksnbeans On: Tue Apr 08, 2014 1:32 pm

I may sound like I'm a dummy but what is condensing temperature?
franksnbeans
 
Stoker Coal Boiler: AA 130
Coal Size/Type: Pea

Re: Is high temp normal in aa 130

PostBy: Sting On: Tue Apr 08, 2014 1:40 pm

franksnbeans wrote:I may sound like I'm a dummy but what is condensing temperature?


Some folks here will consider my explanation an affront to their entitlement - so i am developing a style of posting links to explain and help folks with questions

--- exactly such as this - thank you for asking - please click the link above I provided

and sticking my neck out -- I wouldn't run a boiler below 145 at any time of the year - you may benefit from a search on these threads regarding boiler protection

Kind Regards
Sting
Sting
 
Other Heating: OBSO Lennox Pulse "Air Scorcher" burning NG

Re: Is high temp normal in aa 130

PostBy: franksnbeans On: Tue Apr 08, 2014 2:47 pm

Thanks for the info. It seems you can learn something new everyday.
franksnbeans
 
Stoker Coal Boiler: AA 130
Coal Size/Type: Pea

Re: Is high temp normal in aa 130

PostBy: Sting On: Tue Apr 08, 2014 3:07 pm

Thank-you for the kind reply

In my world - when a solid fuel appliance is often climbing above its set point - .
You may have the call from the load set to aggressively - your flow is wrong
You may have the differential set incorrectly on the boiler -your running to hot, in relation to the outdoor reset curve
you may not have boiler protection in your control set so recovery is slow (the engine gets up a big head and has no place to go) causing a latent after-burn
Summary - your system is out of balance

Sting
Sting
 
Other Heating: OBSO Lennox Pulse "Air Scorcher" burning NG

Re: Is high temp normal in aa 130

PostBy: lsayre On: Tue Apr 08, 2014 5:45 pm

Sting, could part of the problem with overshooting the top end temp be due to these boilers only holding about 27 gallons of water?
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Stockton Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)

Re: Is high temp normal in aa 130

PostBy: Sting On: Tue Apr 08, 2014 6:03 pm

lsayre wrote:Sting, could part of the problem with overshooting the top end temp be due to these boilers only holding about 27 gallons of water?


yes - less volume to accept a hi fire that may suddenly not be necessary...

But in all the drivel I have written about balance - that sudden "not necessary" could be avoided by planning and control.

and all that really is "Not necessary" = but nice! :)

almost like the house grounding you guided me into doing - well maybe my grounds were messed up and it was necessary to gain control

It Depends! :D
Sting
 
Other Heating: OBSO Lennox Pulse "Air Scorcher" burning NG

Re: Is high temp normal in aa 130

PostBy: lsayre On: Tue Apr 08, 2014 6:13 pm

With the AA's and Coal Guns there is no moderation of the fire itself. It is either high firing with the fan running or sitting with the fan off and loafing. Nothing in-between that I'm aware of.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Stockton Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)

Re: Is high temp normal in aa 130

PostBy: coaledsweat On: Tue Apr 08, 2014 6:43 pm

lsayre wrote:With the AA's and Coal Guns there is no moderation of the fire itself. It is either high firing with the fan running or sitting with the fan off and loafing. Nothing in-between that I'm aware of.

That is correct. Your temps are way to high, set the low at 145° and the high at 165° (unless you really need them higher). The Axeman will overshoot with regularity. It isn't a problem, just the nature of the beast.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re: Is high temp normal in aa 130

PostBy: franksnbeans On: Tue Apr 08, 2014 10:10 pm

Yep. just as I thought. Got home around 3pm and water temp was at 210. Went out came home around 7 and the fire was out! Thinking there was no call for heat all day but water stayed over hi temp cut off. not allowing timer to run. I dropped hi to 165 low to 150 and the boiler seems to moderate right in that zone nice and easy. No dramatic highs and lows, although time will tell. Water leaving boiler is 165 to 150 and returning around 140 to 136, when a zone is running.

A little history....

Im heating the house with radiant floor heating. So if there is no call for heat for a long time, like this time of year... When the temp drops outside all at once... like this time of year at night.... with everyone also taking showers that time of night, the boiler gets slammed. The problem arises that I heat two small bedrooms upstairs with baseboard. Not wanting to put radiant in my ceilings when I built the house. So that really should be running with 180 water. Although it would probably be fine with 165. Because with radiant alone and dhw I don't need any high temps.

There is definitely a learning curve here. Im finding out burning coal is an interesting hobby on top of saving money while heating the water.
franksnbeans
 
Stoker Coal Boiler: AA 130
Coal Size/Type: Pea

Visit Lehigh Anthracite