Damage To Stoker Stove/Furnace During Power Outage...

Damage To Stoker Stove/Furnace During Power Outage...

PostBy: watkinsdr On: Mon Oct 01, 2007 3:03 pm

After installing my new Keystoker Koker furnace, I began wondering :idea: : What would happen if I lost power while this mother was kicking out 160K BTUs? I'm assuming serious damage to the stoker assembly, stoker fan motor, anything made of plastic, etc. :twisted:

I have a 12.5 KV backup generator with transfer switch; however, it will take me approximately 10 - 15 minutes to get this power source on line---and that's if I'm home---could be longer if no one is home during the outage...

Do any of you folks out there have uninterruptible power source (UPS) backup power for your stoker stoves? If so, any recommendations for a resonably priced UPS solution?? I'm looking at enough UPS backup to run the furnace for about 60 minutes with a load of approximately 450 watts.

Many thanks in advance.
watkinsdr
 
Stoker Coal Boiler: AHS S260 Boiler

PostBy: LsFarm On: Mon Oct 01, 2007 3:33 pm

Hi Watkinsdr. I don't think you have to worry about it overheating, once the combustion fan shuts down, the amount of heat output drops by about 75%. With no air being forced through the layer of coal on the burner bed, it will cool way down within a minute or two.

Unless you have a very strong draft pulling air through the comustion fan and passageways, the fire will go out pretty quick.

Fire up the unit and shut off the combustion fan and stoker motor, you will see what I mean.

As for the power supply, take a look at this:

http://nepacrossroads.com/viewtopic.php?t=1977

Greg L.
Last edited by LsFarm on Fri Oct 05, 2007 8:49 am, edited 1 time in total.
LsFarm
 
Stoker Coal Boiler: Axeman Anderson 260
Hand Fed Coal Boiler: Self-built 'Big Bertha' SS Boiler
Baseburners & Antiques: Keystone 11, Art Garland

PostBy: WNY On: Mon Oct 01, 2007 8:42 pm

We have had power outages with our keystoker, it shuts down pretty fast and cools off, usually will re-light if power is restored less than 1-2 hours, there are still hot coals underneath, and will take 20-30 mins to come back up....but sometimes it doesn't.
WNY
 
Hot Air Coal Stoker Stove: Keystoker 90K, Leisure Line Hyfire I
Coal Size/Type: Rice
Stove/Furnace Make: Keystoker, LL & CoalTrol
Stove/Furnace Model: 90K, Hyfire I, VF3000 Soon

Visit Lehigh Anthracite

PostBy: watkinsdr On: Mon Oct 01, 2007 8:55 pm

Thank you! You're absolutely right, the fire will die quickly without the combustor fan running. Makes sense! I have a barometric damper controlling draft; so, that's not a problem either. Guess the stove can wait until I have my generator running. Thanks again!!! :)
watkinsdr
 
Stoker Coal Boiler: AHS S260 Boiler

PostBy: coaledsweat On: Mon Oct 01, 2007 9:25 pm

Probably the only thing that will hurt a decent coal appliance would be overfiring.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

PostBy: oliver power On: Fri Oct 05, 2007 6:09 am

watkinsdr wrote:Thank you! You're absolutely right, the fire will die quickly without the combustor fan running. Makes sense! I have a barometric damper controlling draft; so, that's not a problem either. Guess the stove can wait until I have my generator running. Thanks again!!! :)
The only problem I know of is: If the fire goes completely out , and the power comes back on , the thermastat keeps calling for heat. So , the stoker keeps pushing in coal. All the coal in the hopper ends up in the ash pit. That's what happens with my neighbors stoker boiler. Does anyone on this board know of some kind of switch which would prevent this situation? Battery back-up would be one way.
oliver power
 
Stoker Coal Boiler: KEYSTOKER Kaa-2
Hand Fed Coal Stove: Hitzer 50-93 & 30-95, Vigilant (pre-Vigilant-II)
Baseburners & Antiques: MANY (Mostly when burning wood)
Stove/Furnace Make: HITZER / KEYSTOKER
Stove/Furnace Model: 50-93 & 30-95 , Kaa-2

PostBy: coaledsweat On: Fri Oct 05, 2007 8:28 am

A temperature probe near the firebox can shut down the stoker when the heat falls below a setpoint.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

PostBy: e.alleg On: Fri Oct 05, 2007 9:43 am

A simple aquastat (I think Honeywell 6006) that is set 20 degrees below the low limit on the boiler will shut the system down in case of an outfire. Lack of hot water is usually a sign that the fire is out so it usually gets relit before too much time goes by unless you are on vacation. You'll need an override switch when firing up the boiler though.
e.alleg
 
Stove/Furnace Make: EFM
Stove/Furnace Model: 520

PostBy: Yanche On: Fri Oct 05, 2007 10:44 am

oliver power wrote:
watkinsdr wrote:Thank you! You're absolutely right, the fire will die quickly without the combustor fan running. Makes sense! I have a barometric damper controlling draft; so, that's not a problem either. Guess the stove can wait until I have my generator running. Thanks again!!! :)
The only problem I know of is: If the fire goes completely out , and the power comes back on , the thermastat keeps calling for heat. So , the stoker keeps pushing in coal. All the coal in the hopper ends up in the ash pit. That's what happens with my neighbors stoker boiler. Does anyone on this board know of some kind of switch which would prevent this situation? Battery back-up would be one way.
You need a Double Pole Single Throw (DPST) relay and a push button switch. The manual push button pulls in the relay. Once it's closed one set of relay contacts keeps the relay closed. Now you can let go of the push button switch. The relay says closed. The other set of contacts controls whatever you want. If the power goes out the relay drops out and everything is turned off. Very common circuit in motor controls. It has some disadvantages. If the power goes out, you must be there to re-set the relay. Depending on what you are trying to do this may be acceptable. Additional circuity could ring an alarm when the power returns alerting you to look at your stove.
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

PostBy: ken On: Fri Oct 05, 2007 11:47 am

well i need to be completely independent. the stove is great for that. just fill the hopper and empty the ashes. a little cleaning here and there. i also bought a generator that will run the stove , lights , PC and few other things if needed. to run the water pump i would have to run only the pump. i could live with out water for couple days. i have 6 gallon jugs put away for that. i'm running the generator exquast through the wall in the kitchen. i can fire it up and plug in what i need with cords. the kitchen is other side of house from the stove. i would not be able to get the generator outside , fire it up , run the cords. be to hard. i live in the booneys and the power goes out alot , sometimes for days. an ice strom it could be weeks :shock:
ken
 
Stove/Furnace Make: Keystoker - Rice Coal
Stove/Furnace Model: 75K - Bay Window - Direct Vent

PostBy: Bob On: Fri Oct 05, 2007 12:04 pm

Yanche wrote:
oliver power wrote:
watkinsdr wrote:Thank you! You're absolutely right, the fire will die quickly without the combustor fan running. Makes sense! I have a barometric damper controlling draft; so, that's not a problem either. Guess the stove can wait until I have my generator running. Thanks again!!! :)
The only problem I know of is: If the fire goes completely out , and the power comes back on , the thermastat keeps calling for heat. So , the stoker keeps pushing in coal. All the coal in the hopper ends up in the ash pit. That's what happens with my neighbors stoker boiler. Does anyone on this board know of some kind of switch which would prevent this situation? Battery back-up would be one way.
You need a Double Pole Single Throw (DPST) relay and a push button switch. The manual push button pulls in the relay. Once it's closed one set of relay contacts keeps the relay closed. Now you can let go of the push button switch. The relay says closed. The other set of contacts controls whatever you want. If the power goes out the relay drops out and everything is turned off. Very common circuit in motor controls. It has some disadvantages. If the power goes out, you must be there to re-set the relay. Depending on what you are trying to do this may be acceptable. Additional circuity could ring an alarm when the power returns alerting you to look at your stove.


Seems to me that a disadvantage of this sort of control, as noted by Yanche, is that it will need a manual reset any time the power goes out--even if it is a momentary interruption. I would think a control that only disconnects on a longer outage would be desirable.
Bob
 
Stoker Coal Boiler: AHS 130
Coal Size/Type: Pea/Anthracite

PostBy: Yanche On: Fri Oct 05, 2007 4:50 pm

Read the second paragraph of my previous post on the power fail back/backup problem. It offers a solution that will work well. See: http://nepacrossroads.com/viewtopic.php?p=10849#10849
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

Visit Lehigh Anthracite