Stoker Low Temp Shutdown Switch

Stoker Low Temp Shutdown Switch

PostBy: CoaLen On: Mon Aug 25, 2008 10:54 am

Looking for some direction.
I've yet to light my Koker for the first time so I've got a lot to learn and this site is making that easier to do.
One thing I have learned recently is that a power outage of more than about about 15 minutes may cause my direct vent furnace to go out. Once power is restored, my stoker will be busy pushing coal into my ash bucket until I get home from work. I'd like to prevent that from happening by installing a Thermodisc 60T snap-action low temp control switch in the vent pipe above the direct vent blower. My problem is I have been unable to locate a vendor to buy the switch from.
Question: where have you guys been finding these switches?
-Len :help:
CoaLen
 
Hot Air Coal Stoker Furnace: Keystoker Koker
Coal Size/Type: rice

Re: Stoker Low Temp Shutdown Switch

PostBy: WNY On: Mon Aug 25, 2008 3:22 pm

Just do a google search on SNAP SWITCH or THERMAL SNAP SWITCH, many companies sell these, probably an 80-100 degree, Close on Rising Temp (or open on falling temp). Probably around $20-30

Just get one rating for 110VAC, probably 1-5 amps would be plenty.

basically like this:

http://www.thermodisc.com/

My previous design.

flue temperature sensor interlock device
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

Re: Stoker Low Temp Shutdown Switch

PostBy: CoaLen On: Mon Aug 25, 2008 5:08 pm

Been there done that.
I've found quite a bit of information on the Therm-O-Disc thermal snap switch, but have yet to find anyone that will sell me one. I've "googled" this from every angle I can think of but haven't come up with a source yet.
CoaLen
 
Hot Air Coal Stoker Furnace: Keystoker Koker
Coal Size/Type: rice


Re: Stoker Low Temp Shutdown Switch

PostBy: gambler On: Mon Aug 25, 2008 6:01 pm

Check out pellet stove and corn stove dealers. Most of these stoves from just about any mfg. use the thermo disc switches for proof of fire.
gambler
 
Stove/Furnace Make: Leisure Line
Stove/Furnace Model: Pioneer

Re: Stoker Low Temp Shutdown Switch

PostBy: CoaLen On: Mon Aug 25, 2008 6:24 pm

Outstanding Rick!
Thank you all very much.
I'll see what I can do with this.
-Len
CoaLen
 
Hot Air Coal Stoker Furnace: Keystoker Koker
Coal Size/Type: rice

Re: Stoker Low Temp Shutdown Switch

PostBy: Sting On: Mon Aug 25, 2008 6:25 pm

http://www.grainger.com/product/2E245?BaseItem=2E247

WEll this session will not last so once on the web page search for 2E247
if you want something a little hotter use the 2E245

about 10 bucks and freight :!:
Last edited by Sting on Mon Aug 25, 2008 9:05 pm, edited 1 time in total.
Sting
 
Other Heating: BurnHAM=NG-gas

Re: Stoker Low Temp Shutdown Switch

PostBy: CoaLen On: Mon Aug 25, 2008 6:59 pm

Thank you Sting.
That looks exactly like what I need.
I'll follow up with Grainger.
You guys are are a wealth of knowledge, that's for sure!
-Len
CoaLen
 
Hot Air Coal Stoker Furnace: Keystoker Koker
Coal Size/Type: rice

Re: Stoker Low Temp Shutdown Switch

PostBy: WNY On: Mon Aug 25, 2008 8:30 pm

I forgot where I got mine, I think it was a Solar or Woodstove website.? It know it was around $25, need to hook it up for this winter, only had one mishap of a full ash pan of coal.
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

Re: Stoker Low Temp Shutdown Switch

PostBy: CoaLen On: Mon Aug 25, 2008 9:22 pm

Thanks to you guys I think I've got what I need.
I'm going to go to Grainger and buy one of two switches:

http://www.white-rodgers.com/wrdhom/pdf ... pg0091.pdf
or
http://www.white-rodgers.com/wrdhom/pdf ... pg0090.pdf

I'll probably go with the fixed 90 deg-110 deg switch.
I'm going to wait until I have a chance to run the furnace before I make a final decision. I want to measure some temperatures while it's running. I've got a thermometer on order and winter will probably be here before ya know it.
-Len
CoaLen
 
Hot Air Coal Stoker Furnace: Keystoker Koker
Coal Size/Type: rice

Re: Stoker Low Temp Shutdown Switch

PostBy: Freddy On: Tue Aug 26, 2008 4:09 am

What about on a boiler? I have a friend that's thinking of something like this for his Keystoker and wants to put it on the exhaust pipe but I think that would get far too hot during operation. Any ideas?
Freddy
 
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined

Re: Stoker Low Temp Shutdown Switch

PostBy: Sting On: Tue Aug 26, 2008 8:25 am

Freddy

My boiler has the 90- 110 version of this switch in the upper smoke chamber - I monitor that.

Under HARD burn I see surface temperatures exceeding 375 - occasional spikes 10% more -- the switch lasts fine in that environment.

But I will report that early on --- to fool it and get fuel to a new fire --- I would hit it with my propane torch so it would see 110 a bit sooner :) :) :) -- once I hit it too hard and it didn't like that. :shock: Grainger had me a new one the next day :D

Kind Regards
Sting
Sting
 
Other Heating: BurnHAM=NG-gas

Re: Stoker Low Temp Shutdown Switch

PostBy: Freddy On: Tue Aug 26, 2008 10:44 am

Sting wrote:temperatures exceeding 375 - occasional spikes 10% more -- the switch lasts fine in that environment.


Oh, neato! I'll tell him. I thought that a bypass switch would be needed to get things up to temp, but a (gentle) propane seems like a good idea.
Freddy
 
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined

Re: Stoker Low Temp Shutdown Switch

PostBy: Sting On: Tue Aug 26, 2008 11:53 am

it really doesn't take much of a kindling fire and combustion air to get the snap switch to register and to close

At least in my baby boiler :)

but after the last debacle with my propane torch on the snap switch ( three seasons past now) --- well I leaned to be patient another 35 seconds or so for it to heat up on its own.

Yeah -- it don't take to many 15 dollar mistakes to catch my attention!!! :lol:
Sting
 
Other Heating: BurnHAM=NG-gas

Re: Stoker Low Temp Shutdown Switch

PostBy: pvolcko On: Wed Aug 27, 2008 5:40 pm

Len, keep in mind that with a mechanical vent furnace/stove there is a WMO or other venting safety switch which will generally trigger in a power outage of more than a minute or two, which will prevent the stove from feeding when the power comes back on. The posts you've seen in other threads about adding a low temp cutoff switch is typically for chimney vented stoves where there is no venting safety switch installed.
pvolcko
 

Re: Stoker Low Temp Shutdown Switch

PostBy: WNY On: Wed Aug 27, 2008 8:58 pm

My keystoker is a direct vent and the safety interlock doesn't trip out on power outage. The Direct Vent safety plume switch has never tripped. I think if there is a blockage or the DV fails and it keeps stokings, the gases/ashes get out the hole to the sensor, it may trip. That is the one I have had problems with the coal continuing to be pushed after flame out.
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