What Mods Would You Do... Hotblast 1321

 
Smitty275
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Post by Smitty275 » Sat. Jan. 09, 2016 2:01 pm

Finally finished the shaker grates and have them installed. Original grates had 1/4" slots in them and were otherwise solid and a 1/4 - 5/16" thick casting. The setup I made is from 1/2" structural steel. Burned out frames to start and took the drop out of the frames to make the grates. I machined 4 "U" shaped saddles to hold the grate pivots. The grate pivots are steel dowels with 1/2 square broached through them. To connect the grates and shaker handle I used 1/2" key stock. Will get to fire it up tonight. Supposed to fall into the low teens by tomorrow evening.
Also replaced some broken fire bricks.

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Original grates

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The burnouts

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The bottom of the grate assembly.

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The assembly from the top side.

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SWPaDon
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Post by SWPaDon » Sat. Jan. 09, 2016 2:37 pm

That looks good. Keep us informed as to how it works.

 
Smitty275
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Hand Fed Coal Furnace: Currently a Warm Morning 414 A. Previously had a Hot Blast 1321
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Post by Smitty275 » Tue. Jan. 12, 2016 10:19 pm

So far this was the best thing I've done in a long time. It's so easy to shake and load now. Plus I'm burning less coal. Probably because I'm not disturbing it as much as when I had to shove a bar under it to get the ash to fall. Now it's easy to give a few shakes while watching for hot embers and stop.

Tonight its finally cold enough AND windy enough that I could remove the plate covering the front 1/2 of the grate and load the full length of the fire box. Going to be around +5 tonight and still 73-75 inside. Wooo Hoooooo........,

 
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Lightning
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Post by Lightning » Wed. Jan. 13, 2016 7:58 am

I don't see the rear liner in the back of the firebox.
Do you run without it??

Beautiful job on those grates!
I'm interested to see how they work out for you.. :)

 
Smitty275
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Post by Smitty275 » Wed. Jan. 13, 2016 8:27 am

I got this used and it didn't have liners in the back. I've seen other HotBlast furnaces that were same, no liner across the back. Possibly because that surface is blown on directly by the blower so heat transfer there is a good thing.
It really doesn't burn well if I shove the coal against the back. I usually use my rake and pull it forward just a little so it doesn't go out in the back half of the box.

 
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SWPaDon
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Post by SWPaDon » Wed. Jan. 13, 2016 8:36 am

Good catch Lightning, I didn't even notice.

Smitty, It might be a good idea to line the rear (and the front if nothing is there) with firebrick to protect the firebox. It's only thin steel and could burn through relatively easily.

 
Smitty275
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Post by Smitty275 » Wed. Jan. 13, 2016 9:37 am

With the rear being vertical and no "shelf" across the back how would I get the bricks to stay in place? The grates span side to side, they have nothing to rest on in the back or front of the box.
In front the door is as wide as the grates. Maybe even a bit wider. Between the grates and the door, which is about 3", is a loose ramp that just lays in place that keeps anything from getting against the actual fire box. I think it's main purpose is the keep ashes back far enough they fall into the ash pan instead of up against the ash door. So there is really no place coal could even get against the front of the box. Other than if it some how fell forward against the door. And I don't load it in a manner that would happen.


 
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Post by franco b » Wed. Jan. 13, 2016 10:15 am

The grate frame should be able to support the bricks in back.

 
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SWPaDon
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Post by SWPaDon » Wed. Jan. 13, 2016 11:00 am

Smitty275 wrote:With the rear being vertical and no "shelf" across the back how would I get the bricks to stay in place? The grates span side to side, they have nothing to rest on in the back or front of the box.
In front the door is as wide as the grates. Maybe even a bit wider. Between the grates and the door, which is about 3", is a loose ramp that just lays in place that keeps anything from getting against the actual fire box. I think it's main purpose is the keep ashes back far enough they fall into the ash pan instead of up against the ash door. So there is really no place coal could even get against the front of the box. Other than if it some how fell forward against the door. And I don't load it in a manner that would happen.
This is a plate like Lightning was talking about. There is supposed to be 1 in the front, and 1 in the rear. Here is what mine looks like:
liner.jpg
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The bircks sit on the 2 tabs you see, and they lean against the edges of the plate to hold it upright. Linjk to liners: http://www.stove-parts-unlimited.com/Front-and-Rear-Firebox-Liner-p/40264.htm

But you can use bricks. As Franco said, they will stand up on the back of the grate, and if you clean the area maybe furnace cement could be used to stick them to the wall.

 
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SWPaDon
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Post by SWPaDon » Wed. Jan. 13, 2016 11:36 am

Update: the 1321 does not come with a rear plate, but to protect the furnace there probably should be something there.

Here is an parts list for the 1321: http://www.ibuyfireplaceparts.com/skin/frontend/default/ibuystores/pdf/USS-uss1321.pdf

Hope this helps, Don
Last edited by SWPaDon on Wed. Jan. 13, 2016 11:43 am, edited 1 time in total.

 
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Post by Lightning » Wed. Jan. 13, 2016 11:42 am

SWPaDon wrote:Update: the 1321 does not come with a rear plate, but to protect the furnace there probably should be something there.

Here is an parts list for the 1321: http://www.ibuyfireplaceparts.com/skin/frontend/default/ibuystores/pdf/USS-uss1321.pdf
Maybe they use the same plate for the front and back.
On my model they are different.

 
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Post by Smitty275 » Wed. Jan. 13, 2016 4:41 pm

These are the only two picks I have of the ramp that goes between door and grates.

I'll see what I can come up with for the back. For time being I'll just continue to keep the load pulled off the back wall as I have been doing. I don't like the idea of just sitting them on the grate with out leaning back, or some sort of retainer to hold them in place.

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Post by fig » Mon. Nov. 04, 2019 8:19 am

I know this is an old thread, but I was wondering how that plate steel held up to the coal?

 
Smitty275
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Post by Smitty275 » Mon. Nov. 04, 2019 11:34 pm

It did great. Honestly you'd never know they'd been used beside being dirty. They were in use for a little over a year before we moved and since the furnace was attached to the house I had to leave it. So I put the original grates back in. I'm going to be building a new furnace and will put them in it. Sadly this will just be for heating my workshop about 4 months a year. The new house just isn't conducive to hand fired heat as there is only a crawl space. And an outside boiler would be elevated above the main floor requiring more work than it's worth with pumps and zone valves.

 
Smitty275
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Post by Smitty275 » Tue. Dec. 10, 2019 3:21 am

Here's a pic of the steel grates in my new barrel furnace I've built. Still have to put the fire brick in. As you can see they are still in great shape. Being 1/2" thick structural steel I doubt they'll ever wear out in my life time.

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