Aquastat location

Aquastat location

PostBy: CoalregionKid On: Wed Jan 11, 2012 9:19 pm

I currently am burning with a Kaa2 and was wondering if anyone else could post a pic of there full setup. I dont believe i have the small aquastat box with probe in the right location. Have it set at 200 and hooked to my basement zone to dump to but if temp gets to that it just keeps going. Any pics would help greatly. Thanks
CoalregionKid
 
Stove/Furnace Make: Keystoker
Stove/Furnace Model: Kaa2

Re: Aquastat location

PostBy: tikigeorge On: Wed Jan 11, 2012 9:55 pm

Hope this helps.
Attachments
DSC_0001.JPG
(103.09 KiB) Viewed 87 times
View: New PagePopup • Select:BBCode
[nepathumb]32658[/nepathumb]
tikigeorge
 
Stoker Coal Boiler: Keystoker KA-6
Stove/Furnace Make: Keystoker
Stove/Furnace Model: KA-6

Re: Aquastat location

PostBy: dave brode On: Wed Jan 11, 2012 9:58 pm

Does it bring the basement zone on at 200?
dave brode
 
Stoker Coal Boiler: Keystoker KAA-2
Hand Fed Coal Boiler: used to have a 5 section Red Square
Coal Size/Type: rice anthracite

Visit Lehigh Anthracite

Re: Aquastat location

PostBy: AA130FIREMAN On: Wed Jan 11, 2012 10:08 pm

CoalregionKid wrote: if temp gets to that it just keeps going.
You mean the circulator, stoker, or both keep going ? If you wire the zone dump aquastat to the tt terminals on a relay, it should run the circulator, but if the high limit on a triple aquastat is above that temp, the stoker will also run. How is it wired up ?
AA130FIREMAN
 
Stove/Furnace Make: axeman anderson
Stove/Furnace Model: 130 anthratube

Re: Aquastat location

PostBy: steamup On: Thu Jan 12, 2012 12:23 pm

AA130FIREMAN wrote:
CoalregionKid wrote: if temp gets to that it just keeps going.
You mean the circulator, stoker, or both keep going ? If you wire the zone dump aquastat to the tt terminals on a relay, it should run the circulator, but if the high limit on a triple aquastat is above that temp, the stoker will also run. How is it wired up ?



Also look at the temperature differential setting that you don't overlap the high limit setting.

200 deg. for a dump is low in my opinion. 210 to 220 is where you should be at minimum unless you have a expansion tank size problem. I have my AA 130 set at 230 to 240 deg range. The K-6 is set a little lower to the 220 range.

Understand that the mechanical controls used in HVAC are not super accurate. The small scale on the setpoint is for reference and could easily vary +/- a couple of degrees.
steamup
 
Stoker Coal Boiler: Axeman-Anderson AA-130, Keystoker K-6
Hand Fed Coal Boiler: HS Tarm 502 Wood/Coal/Oil
Coal Size/Type: pea, buck, rice

Re: Aquastat location

PostBy: AA130FIREMAN On: Thu Jan 12, 2012 1:09 pm

steamup wrote:
200 deg. for a dump is low in my opinion.
I run mine 205-210, and it's not a real concern at that temp or pressure, I just feel it's more efficient. The greater the difference in temp between the boiler and fire, the more available btu's to be had instead of going up the chimney. And it doesn't over heat the house this time of the year. Either it runs off the thermostat more or the dump zone (pay me now or pay me later). Come spring I'll switch my dump to the garage zone
AA130FIREMAN
 
Stove/Furnace Make: axeman anderson
Stove/Furnace Model: 130 anthratube

Re: Aquastat location

PostBy: staybolt On: Fri Jan 13, 2012 8:27 am

i located my dump aquastat in the back of my kaa2 opposite side of the domestic heater coil. there is a 1/2" pipe plug, removes and put in stat, set for 225 on and 215 off. runs a 2nd floor bathroom zone valve with a toekick heater, gets rid of heat fast. Once or twice in the summer it runs for 10 min on a hot night. Guy
staybolt
 
Stove/Furnace Make: keystoker boiler, godin stove
Stove/Furnace Model: kaa-2, "grand"

Re: Aquastat location

PostBy: AA130FIREMAN On: Fri Jan 13, 2012 9:29 am

staybolt wrote: runs a 2nd floor bathroom zone valve with a toekick heater, gets rid of heat fast.
Sounds like it works, but I like using a large zone, something capable of dumping all the btu's the stoker can put out. IF something would go hay wire, and the stoker would keep firing, if the boiler puts out 130,000 btu's, and the dump can only release 25,000 btu's, somethin' gotta give :blowup: Think of the worst case senario.
AA130FIREMAN
 
Stove/Furnace Make: axeman anderson
Stove/Furnace Model: 130 anthratube

Re: Aquastat location

PostBy: steamup On: Fri Jan 13, 2012 12:40 pm

AA130FIREMAN wrote:
staybolt wrote: runs a 2nd floor bathroom zone valve with a toekick heater, gets rid of heat fast.
Sounds like it works, but I like using a large zone, something capable of dumping all the btu's the stoker can put out. IF something would go hay wire, and the stoker would keep firing, if the boiler puts out 130,000 btu's, and the dump can only release 25,000 btu's, somethin' gotta give :blowup: Think of the worst case senario.



In my humble opinion, all boilers should have a manual reset hi limit aquastat wired to kill the power. I installed one on my AA and a good thing. The first time I fired it, it tripped as I had something wired wrong and it kept firing.

Designing a dump zone to handle full boiler output is expensive and difficult, especially if your heating system doesn't require full boiler output. Rarely does the boiler output match the heating system output. There should be some minor oversizing of the boiler for "pickup"
steamup
 
Stoker Coal Boiler: Axeman-Anderson AA-130, Keystoker K-6
Hand Fed Coal Boiler: HS Tarm 502 Wood/Coal/Oil
Coal Size/Type: pea, buck, rice

Re: Aquastat location

PostBy: staybolt On: Fri Jan 13, 2012 1:35 pm

steamup wrote:
AA130FIREMAN wrote:
staybolt wrote: runs a 2nd floor bathroom zone valve with a toekick heater, gets rid of heat fast.
Sounds like it works, but I like using a large zone, something capable of dumping all the btu's the stoker can put out. IF something would go hay wire, and the stoker would keep firing, if the boiler puts out 130,000 btu's, and the dump can only release 25,000 btu's, somethin' gotta give :blowup: Think of the worst case senario.



In my humble opinion, all boilers should have a manual reset hi limit aquastat wired to kill the power. I installed one on my AA and a good thing. The first time I fired it, it tripped as I had something wired wrong and it kept firing.

Designing a dump zone to handle full boiler output is expensive and difficult, especially if your heating system doesn't require full boiler output. Rarely does the boiler output match the heating system output. There should be some minor oversizing of the boiler for "pickup"


come to think of it you are right with the manual hi limit reset. what if the clock motor was to stop on the low fire cycle timer calling, makes me think. gotta find another plug in the boiler for an immersion reset control.

Since my risk of overtemp happens during summer i put on outdoor reset so the boiler limit is @ 135 so i can keep my indirect water heater zone @ 120. 70deg OA = 135 deg boiler for summer. -10 deg OA = 210 deg boiler for winter
staybolt
 
Stove/Furnace Make: keystoker boiler, godin stove
Stove/Furnace Model: kaa-2, "grand"

Re: Aquastat location

PostBy: AA130FIREMAN On: Fri Jan 13, 2012 4:38 pm

Axeman anderson's have a high limit aquastat that over rides the triple aquastat. I do not have a manual reset type. That would lead to an outfire (mush have it set high) I have mine at 200 and the triple at 180 high. Hold fire timer bypasses the triple but not the high limit.
AA130FIREMAN
 
Stove/Furnace Make: axeman anderson
Stove/Furnace Model: 130 anthratube

Re: Aquastat location

PostBy: Rob R. On: Fri Jan 13, 2012 4:41 pm

CoalregionKid wrote:I currently am burning with a Kaa2 and was wondering if anyone else could post a pic of there full setup. I dont believe i have the small aquastat box with probe in the right location. Have it set at 200 and hooked to my basement zone to dump to but if temp gets to that it just keeps going. Any pics would help greatly. Thanks


Where is the aquastat located, and how do you have it wired?
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: Aquastat location

PostBy: AA130FIREMAN On: Fri Jan 13, 2012 4:51 pm

steamup wrote:
Designing a dump zone to handle full boiler output is expensive and difficult, especially if your heating system doesn't require full boiler output
I use the fancoil in the air handler, it's rated for 130,000 btu's (based on 60 degree incoming air/ 180 water ) as the house temp would increase, the output will decrease,and the hotter the water ,it will increase. If it get's to that point, my garage and basement modines will kick in, and they are over 100,000 btu's combined, IF these fail, I'm out of luck :blowup:
AA130FIREMAN
 
Stove/Furnace Make: axeman anderson
Stove/Furnace Model: 130 anthratube

Re: Aquastat location

PostBy: Rob R. On: Fri Jan 13, 2012 4:53 pm

I have no dump zone. :bag:
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: Aquastat location

PostBy: dave brode On: Fri Jan 13, 2012 6:01 pm

kid,

If the 'stat is bringing the zone on, and the boiler is still running away, I would think that you need to use a larger zone for the dump.

fwiw, I have a air over water system, two hot water coils. One duct system for living area [heat pump], one for basement, with a seperate fan/coil unit. I have dump stats on both. #1 set at 210*, the other at 230* or so. I used the supplied 'stat in my piping to the basement fan/coil. My 'stats turn the fans on, rather than a pump, as most systems do. Mine works this way because I pump the water 24/7, and cycle the fans on/off for heat. I have the other dump stat on piping going to the coil in the living space duct work.

In hindsight, I realize that if my circ pump would fail, the 'stats would not see heat with no water flowing. I wish that I would have placed the dump 'stat in the port in the side of the boiler.

1st pic if the supplied aquastat on the basement fan/coil piping. 2nd pic is a strap on 'stat on the piping to the living space coil. [2nd stat seen in that pic locks the heatpump's compressor out].

Fwiw, here are threads on the subject;

safety device

safety device wiring keystoker

Dave
Attachments
Sep21^02.JPG
(81.79 KiB) Viewed 14 times
View: New PagePopup • Select:BBCode
[nepathumb]32737[/nepathumb]
Sep21^01.JPG
(79.62 KiB) Viewed 14 times
View: New PagePopup • Select:BBCode
[nepathumb]32739[/nepathumb]
dave brode
 
Stoker Coal Boiler: Keystoker KAA-2
Hand Fed Coal Boiler: used to have a 5 section Red Square
Coal Size/Type: rice anthracite

Visit Lehigh Anthracite