Retrofit Hitzer Thermostat to Harman

Modern and vintage hand fired coal stove are similar to a wood stove and in some cases can burn either. They need to be regulated and fed by hand usually every 12 to 24 hours depending on your usage. They require no power to operate making them ideal for rural settings with long power outages.
rberq
Member
Posts: 5012
Joined: Mon. Apr. 16, 2007 9:34 pm
Hand Fed Coal Stove: DS Machine 1300 with hopper
Coal Size/Type: Blaschak Anthracite Nut
Other Heating: Oil hot water radiators (fuel oil); propane
Location: Central Maine

Post Sat. Mar. 14, 2009 3:43 pm

Today I put a thermostatic air intake on my Harman Mark I. I bought stock parts from Hitzer, same as on the Hitzer 30-95, which is roughly the same size stove. I considered parts from a U.S. Stove Wonderwood 2931. I think they would have done as well or better, but I would have had to build my own thermostat housing.

First picture is the air intake tube. My brother welded some ears on it so I could bolt it on. Second picture is my 35-year-old Craftsman 3/8 variable speed drill resting after work. Several forum members recommended that little white Lenox hole saw. It’s tougher than it looks. Third picture is the work of the hole saw. Three one-inch holes for a total intake area of slightly over two square inches if my math is correct. I used Vaseline petroleum jelly from the medicine cabinet to lube the saw and the drill bits. I think the saw is good for another hundred holes. Fourth picture is from inside the ash pit, looking out the new holes. Next picture is the air intake bolted in place, then two pictures of the finished product. At some point I will spray the intake door flat black so it will blend in better. I sealed around the edges of the intake tube with the red high-temperature silicone gasket maker, inside the tube because on the outside the ears are in the way, and the red color would look funny. Now I have to wait patiently for 24 hours for the silicone to cure, before I can find out if the whole thing works.
Attachments
a_intake_tube.jpg
b_craftsman_with_lenox_saw.jpg
c_air_intake_2_square_inches.jpg
d_inside_looking_out.jpg
e_air_intake_bolted_on.jpg
Simple answers for simple minds.

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rberq
Member
Posts: 5012
Joined: Mon. Apr. 16, 2007 9:34 pm
Hand Fed Coal Stove: DS Machine 1300 with hopper
Coal Size/Type: Blaschak Anthracite Nut
Other Heating: Oil hot water radiators (fuel oil); propane
Location: Central Maine

Post Sat. Mar. 14, 2009 3:47 pm

Oops! Last two pics didn't make it on the first posting.
Attachments
f_finished1.jpg
f_finished2.jpg
Simple answers for simple minds.

9mmruger
Member
Posts: 75
Joined: Sat. Feb. 21, 2009 7:18 am
Stove/Furnace Make: Hitzer
Stove/Furnace Model: 30-95
Location: St. Joe County, Southwest, Michigan

Post Sat. Mar. 14, 2009 3:53 pm

Looks like you did a great job to me. Good luck!

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Rob R.
Site Moderator
Posts: 11343
Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Sat. Mar. 14, 2009 4:33 pm

Nice job.

User avatar
009to090
Member
Posts: 5104
Joined: Fri. Jan. 30, 2009 10:02 am
Stoker Coal Boiler: EFM 520 HighBoy
Hot Air Coal Stoker Stove: DVC-500 x 2
Coal Size/Type: Anthracite Rice
Location: Warrenton, NC

Post Sat. Mar. 14, 2009 4:48 pm

How scarey was that, drilling into a perfectly good stove? It reminded me of the time I installed my own SunRoof in my brand new 1981 toyota. Measure Twice, then Measure Twice again, Then finally take the plunge with the sawzall :fear:
If it ain't broke, don't fix it!

User avatar
grizzly2
Member
Posts: 842
Joined: Tue. Feb. 12, 2008 7:18 pm
Hand Fed Coal Stove: Hitzer 30 - 95
Coal Size/Type: pea and nut/ anthracite
Other Heating: Jotul #3 wood stove in garage. Oil backup in house. Electric backup in house.
Location: Whippleville, NY

Post Sat. Mar. 14, 2009 6:04 pm

Looks good :!: I suspect it will work well for you. :)
The only redeeming value of winter is that I can have a fire in my stove.

rberq
Member
Posts: 5012
Joined: Mon. Apr. 16, 2007 9:34 pm
Hand Fed Coal Stove: DS Machine 1300 with hopper
Coal Size/Type: Blaschak Anthracite Nut
Other Heating: Oil hot water radiators (fuel oil); propane
Location: Central Maine

Post Sat. Mar. 14, 2009 6:14 pm

DVC500_at_last wrote:How scarey was that, drilling into a perfectly good stove? It reminded me of the time I installed my own SunRoof in my brand new 1981 toyota.
Well, if it doesn't work out I can always stick chewing gum in the holes and put it back to normal. But going at your own new Toyota with a sawzall? That's brave! Couldn't you find someone else's to practice on first?
Simple answers for simple minds.

CapeCoaler
Member
Posts: 4427
Joined: Sun. Feb. 10, 2008 3:48 pm
Stoker Coal Boiler: want AA130
Hand Fed Coal Stove: DS Machine BS#4, Harman MKII, Hitzer 503,...
Coal Size/Type: Pea/Nut/Stove
Location: Cape Cod, MA

Post Sat. Mar. 14, 2009 10:54 pm

Not centered on the side because...
I am not an engineer, train or otherwise!
I stay at a Holiday Inn at least once a year!
Most of all I do have common sense and a practical application of logic.
Oh, add humor, on the dry side, along with a wee bit 'o sarcasm.

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rberq
Member
Posts: 5012
Joined: Mon. Apr. 16, 2007 9:34 pm
Hand Fed Coal Stove: DS Machine 1300 with hopper
Coal Size/Type: Blaschak Anthracite Nut
Other Heating: Oil hot water radiators (fuel oil); propane
Location: Central Maine

Post Sun. Mar. 15, 2009 9:40 am

Not centered on the side because (a) the interior baffle is toward the back, and I didn't want to run afoul of it when drilling for the thermostat, and (b) I don't think it matters much -- the Hitzers let their air in on a back corner.

The thermostat housing also is not centered above the intake, because the chain attaches to the bi-metal spring close to one side of the housing. I tried to position it so the chain would run vertically.

In retrospect I could have mounted the thermostat closer to the top, without running out of chain. That would change the pull angle slightly. But I'll try it like this and see how it works. It gets fired up later today.
Simple answers for simple minds.

CapeCoaler
Member
Posts: 4427
Joined: Sun. Feb. 10, 2008 3:48 pm
Stoker Coal Boiler: want AA130
Hand Fed Coal Stove: DS Machine BS#4, Harman MKII, Hitzer 503,...
Coal Size/Type: Pea/Nut/Stove
Location: Cape Cod, MA

Post Sun. Mar. 15, 2009 9:57 am

Mr. Murphy would see to it that the screw hole would line up perfectly with the baffle edge or weld bead!
Agree that the location is no big deal.
You may get the ash buildup from that side instead of the front.
Plenty of room to go around the ash pan.
Now are you going to radius those holes to get maximum airflow?
I am not an engineer, train or otherwise!
I stay at a Holiday Inn at least once a year!
Most of all I do have common sense and a practical application of logic.
Oh, add humor, on the dry side, along with a wee bit 'o sarcasm.

User avatar
oliver power
Member
Posts: 2266
Joined: Sun. Apr. 16, 2006 9:28 am
Stoker Coal Boiler: KEYSTOKER Kaa-2
Hand Fed Coal Stove: Hitzer 50-93 & 30-95, Vigilant (pre-Vigilant-II), D.S. 1600 Circulator
Baseburners & Antiques: MANY (Mostly when burning wood)
Location: Near Dansville, NY

Post Sun. Mar. 15, 2009 11:08 am

Nice looking job! I do believe it will work just fine. Some day, should you ever get the stove near a welder & torch, you can weld around the inlet, then cut the holes out completely. On second thought, I'd leave it the way it is. This way you have the option of putting the set-up on a different stove.

rberq
Member
Posts: 5012
Joined: Mon. Apr. 16, 2007 9:34 pm
Hand Fed Coal Stove: DS Machine 1300 with hopper
Coal Size/Type: Blaschak Anthracite Nut
Other Heating: Oil hot water radiators (fuel oil); propane
Location: Central Maine

Post Sun. Mar. 15, 2009 3:08 pm

Capecoaler, I don't know what it means to "radius the holes", so I guess I won't, or if I do it will be by accident and I won't know I have done it. I think I will have enough airflow now, slightly more than 2 square inches. I did some crude measurements and estimates on my spin draft, and that's more intake area than I ever ran the stove at except for right after loading new coal. As you mentioned, I am curious to see whether the burn pattern and ash buildup change noticeably.

oliver, my brother volunteered to weld the air intake, but it didn't seem wise to do it in the living room with the lace curtains four feet away, and I didn't want to unhook everything to haul it out to the garage. If I decide to undo it, this will be easier.
Simple answers for simple minds.

User avatar
grizzly2
Member
Posts: 842
Joined: Tue. Feb. 12, 2008 7:18 pm
Hand Fed Coal Stove: Hitzer 30 - 95
Coal Size/Type: pea and nut/ anthracite
Other Heating: Jotul #3 wood stove in garage. Oil backup in house. Electric backup in house.
Location: Whippleville, NY

Post Sun. Mar. 15, 2009 4:10 pm

[quote="rberq"]Capecoaler, I don't know what it means to "radius the holes", so I guess I won't, or if I do it will be by accident and I won't know I have done it.

:lol: I think Capecoaler must have some engine modification background. Radius the holes would be the equivalent of porting and polishing the intake ports on an engine head and intake manifold for better air flow. I suspect he is saying it "tounge in cheek". :D
The only redeeming value of winter is that I can have a fire in my stove.

CapeCoaler
Member
Posts: 4427
Joined: Sun. Feb. 10, 2008 3:48 pm
Stoker Coal Boiler: want AA130
Hand Fed Coal Stove: DS Machine BS#4, Harman MKII, Hitzer 503,...
Coal Size/Type: Pea/Nut/Stove
Location: Cape Cod, MA

Post Sun. Mar. 15, 2009 4:38 pm

Hot Rod Harman!
Hitzman..
Har...
Hitman!
I am not an engineer, train or otherwise!
I stay at a Holiday Inn at least once a year!
Most of all I do have common sense and a practical application of logic.
Oh, add humor, on the dry side, along with a wee bit 'o sarcasm.

User avatar
Westy
Member
Posts: 35
Joined: Tue. Sep. 30, 2008 5:47 pm
Stove/Furnace Make: Harman Mark 2
Location: Ontario,Canada

Post Sun. Mar. 15, 2009 7:41 pm

Looks good Bob, what was the price of the thermostat?

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