New Kuuma Vapor Fire Install

brenndatomu

Minister of Fire
Aug 21, 2013
5,529
NE Ohio
nothing wrong with the dump opening before that high limit.
My Yukon EHD came with the 210* link...and believe me, that monster ran higher duct temps than any Kuuma! (had to run 'er hot to keep the chimney from plugging up in less than 48 hours ;) ;lol
 

JRHAWK9

Minister of Fire
Jan 8, 2014
1,501
Wisconsin Dells, WI
My Yukon EHD came with the 210* link...and believe me, that monster ran higher duct temps than any Kuuma! (had to run 'er hot to keep the chimney from plugging up in less than 48 hours ;) ;lol

yeah, I was going to mention we could get a way with a MUCH lower fusible link temp. As if our plenum temps even hit 150° there is something wrong. Well, I guess mine may in the middle of the winter when I temporarily shut my blower off when I re-load. I have a second low limit switch wired in as an emergency to a different speed tap on my blower in case my speed controller takes a dump. This is set to 175° and that has never tripped, even when I have shut my blower off when re-loading.
 
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brenndatomu

Minister of Fire
Aug 21, 2013
5,529
NE Ohio
Where is the fusible link installed? Inside the plenum?
No its in the EHD...which gets attached to the side of the plenum after a 12" ish hole is cut in the plenum
 

brenndatomu

Minister of Fire
Aug 21, 2013
5,529
NE Ohio

Highbeam

Minister of Fire
Dec 28, 2006
17,996
Mt. Rainier Foothills, WA
Any others that would be interested in an emergency heat dump? Considering making a few...
dude... don’t do it. The liability is insanely high. Super easy for some investigator to blame this device for causing the fire that burned the house down and killed the children. You could lose everything and end up in jail.

There’s a reason that the big boys with insurance and lawyers won’t build these things.
 

brenndatomu

Minister of Fire
Aug 21, 2013
5,529
NE Ohio
There’s a reason that the big boys with insurance and lawyers won’t build these things.
No, there is nobody left in the forced air wood furnace world that gives a rip about a EHD...they all just tell you not to install in a down-flow configuration, etc, etc...but I hear ya...liability/headache/hassle would be the main reason I don't do it, if I don't.
It's not like anybody is gonna become wealthy making them...last I seen Yukon's EHD was something like $169
 

brenndatomu

Minister of Fire
Aug 21, 2013
5,529
NE Ohio

laynes69

Minister of Fire
Oct 2, 2006
2,515
Ashland OH
It may not be pretty, but a dedicated opening close to the plenum within the living space feom the main trunk would be ideal. Power goes, trap opens into floor above and gravity takes hold. Our previous furnace during an outage would get so hot, water droplets would dance on the surface of the ductwork above it. Nothing that I would ever wish on anyone! But 6 cubic feet of firebox burning white hot during an outage was a fire waiting to happen.
 

sloeffle

Minister of Fire
Mar 1, 2012
706
Central Ohio
I thought you were working from home?! ;) ;lol

Not yet...wanted to see how much interest there actually is first...have some ideas in mind for design...probably 12" x 12" (tall/wide) x 8" ish deep.
As far as the link, I was planning on the same one that came on my Yukon EHD https://www.mcmaster.com/1147A19/
If free labor equates to a free heat dump count me in for sure. I could probably run up there one weekend and help you if you want.
 
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brenndatomu

Minister of Fire
Aug 21, 2013
5,529
NE Ohio
If free labor equates to a free heat dump count me in for sure. I could probably run up there one weekend and help you if you want.
You sure you wanna expose yourself to that liability...we might get our pants sued off... ;) ::-)
 

RockyMtnGriz

Member
Apr 19, 2019
87
SW Montana
Just so y'guys know, the temps inside the Kuuma plenum are all over the place, depending on where you measure. I currently have a probe centered on the front of the plenum, about 4" up from the bonnet, and about 1 1/2" into the air stream. I get temps there ranging from 220 just before the fan kicks on, to 140 when the fan is continuously running. That's using a fan control, located in this general area. If you were using the stock, slow to respond, snap switch (is anybody doing that?), you'd probably see a lot hotter temps for a while before the fan activates. The air that comes out of the front cover and the angled tubes is hot. If you're putting a link on the front side, particularly low, you might want to check your temps before you settle on a link temp to avoid nuisance trips.

Just hoping to maybe save you a little aggravation.
 

RockyMtnGriz

Member
Apr 19, 2019
87
SW Montana
It may not be pretty, but a dedicated opening close to the plenum within the living space feom the main trunk would be ideal. Power goes, trap opens into floor above and gravity takes hold. Our previous furnace during an outage would get so hot, water droplets would dance on the surface of the ductwork above it. Nothing that I would ever wish on anyone! But 6 cubic feet of firebox burning white hot during an outage was a fire waiting to happen.
That you could make of parts you can buy today. A normal (large) register on the floor above, with an upward duct controlled by a normally open electric duct damper. Power goes off, damper opens.

Not quite as good as a dump controlled by a fusible though, that would work even if, say, the power stayed on, but the blower failed.