WMO-1 Safety Switch Install on Natural Draft Pocono

A Coal stoker furnace or stove controls most operations including automatically feeding the coal. They are quite similar to any conventional oil and gas units and easily operated for extended periods of time. They commonly use rice coal but may use larger sizes like buckwheat. They can be used as primary heat, supplementary heat or have a dual set up with your existing oil/gas furnace.
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Uglysquirrel
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Stove/Furnace Model: Pocono

Post Mon. Jan. 18, 2010 8:02 pm

Was thinking of installing the Fields WMO-1 200 degree F safety switch on the lower rear body of a natural draft top vent Pocono (no powervent). This is being considered even though the pipes are mostly always clean, just concerned about backdraft on those warmer days with three doggies upstairs. Until I train them to know what to do if the stove looses draft, the switch may be a consideration.

In normal (good draft) operation the switch's design pulls air thru a slot into the stove via a ~1/2" ID pipe, this suggesting I'm loosing a bit of negative draft in the body. My operating draft is always .04 ~12" above the stove's top plate on cold days and even then the baro flap is tilted open suggesting there is at least ~ .06 draft or maybe a bit more. ;>

Before I put a 3/4" installation hole in the Poke, is there data that suggests my body draft loss will not be appreciably affected by the switch's install ? Just a bit concerned how this switch affects the understood recommended ~.02 min draft in the body with the combustion fan on. I'm thinking everything should be ok but just wanted to check with you guys regarding some real experience with the WMO-1 installed on a non powervent install.

Thanks

Ugly

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WNY
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Joined: Mon. Nov. 14, 2005 8:40 am
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
Location: Cuba, NY
Contact:

Post Mon. Jan. 18, 2010 8:08 pm

I don;t think it would be a problem, you just may have to adjust the baro and combustion blower to compensate, if at all. I may not even make a noticable difference with the hole.
- Dave
Hyfire I & Keystoker 90K heating an 1890 Victorian
- Amsoil Authorized T1 Certified Dealer

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Matthaus
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Stoker Coal Boiler: Leisure Line WL110 Dual Fuel, natural gas
Hot Air Coal Stoker Stove: Leisure Line Lil' Heater (rental house)
Coal Size/Type: Rice and Buckwheat Anthracite
Location: Wilkes Barre, PA

Post Mon. Jan. 18, 2010 8:45 pm

On the subject of a WMO-1 on a naturally aspirated stove, no problem, just need to keep an eye on the hopper lid for any sign of moisture indicating that the stove over fire pressure is too high (too low a number numerically, like in the -.01" WC or lower range).

I see no problem with installing a WMO-1, just be alert to signs of improper stove pressure and draft. :)
Matthaus
Leisure Line Stove Company
http://www.leisurelinestoves.com/

coalnewbie
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Posts: 6209
Joined: Sat. May. 24, 2008 4:26 pm
Hot Air Coal Stoker Stove: LL AnthraKing 180K, Pocono110K,KStokr 90K, DVC
Hand Fed Coal Stove: Invader 2
Baseburners & Antiques: Wings Best, Glenwood #8(x2) Herald 116x
Coal Size/Type: Rice,
Other Heating: Heating Oil CH, Toyotomi OM 22
Location: Chester, NY

Post Tue. Jan. 19, 2010 11:56 am

Wondering about all of this. Would a natural chimney be more efficient than my SWG. So two Pokos (110s) side by side into one outside Chimney. Please no lectures about x feet above the roof as this does not apply to my install really. How long the chimney? and if I join them the diameter? Hat design? Or even two stoves into one 4"SWG - I know they are only rated for 180,000 BTU but the one I have is barely on.

Thx again.
Posted by an unreasonable adult.


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WNY
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Posts: 5849
Joined: Mon. Nov. 14, 2005 8:40 am
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
Location: Cuba, NY
Contact:

Post Tue. Jan. 19, 2010 12:35 pm

Draft is draft. Weather you are pulling it with a natural chimney or Power vent. You will maintain a certain draft on the appliance via the baro damper settings.
less electric/noise without a power venter.

A Power venter is used if you do NOT have a tall enough chimney/draft or a chimney at all.

I have one of each and don't notice any difference in the stoves or burning.
- Dave
Hyfire I & Keystoker 90K heating an 1890 Victorian
- Amsoil Authorized T1 Certified Dealer

coalnewbie
Member
Posts: 6209
Joined: Sat. May. 24, 2008 4:26 pm
Hot Air Coal Stoker Stove: LL AnthraKing 180K, Pocono110K,KStokr 90K, DVC
Hand Fed Coal Stove: Invader 2
Baseburners & Antiques: Wings Best, Glenwood #8(x2) Herald 116x
Coal Size/Type: Rice,
Other Heating: Heating Oil CH, Toyotomi OM 22
Location: Chester, NY

Post Tue. Jan. 19, 2010 4:35 pm

..but doesn't the SWG settings vary from ticking over to b*lls to the wall settings. Does a chimney deal with that variability better? Why is LL now supplying baros with the stoves if not to counter this variability ? Do I lose less hot air with one or the other? Is it worth trying to recapture somehow? So little time - so much to learn and I need to keep saving as much as I can. God, with all the hot air coming from two SWGs I could run a Stirling engine.
Posted by an unreasonable adult.

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Uglysquirrel
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Posts: 1161
Joined: Mon. Jan. 07, 2008 8:27 pm
Stove/Furnace Model: Pocono

Post Tue. Jan. 19, 2010 8:11 pm

Lots of great ideas here. WNY's and Matt's informative comments on the WMO-1 draft effect temporarily dissolved my brain lesion to think that to simulate the WMO install, I'll create a temporary sheet metal plate with a 1/2" ID hole that fits over the top door opening. Hole can be opened & closed. We can they see how the draft is affected on a cold day and on a warm day, all this can be done before that nasty hole is installed in my lovely virgin Pocono.

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