Coal-Trol Controlling Burn Rate For Water Heating

Coal-Trol Controlling Burn Rate For Water Heating

PostBy: Wood'nCoal On: Mon Mar 03, 2008 11:00 pm

As you may have seen I have an Alaska TriBurner in the cellar. It currently has the combined combustion fan and stoker motor, I run it full speed all of the time and control the burn rate by adjusting the carpet travel. I will be adding a separate combustion fan soon and I will adjust the carpet to the travel distance for a full fire and use the rheostat to control the carpet speed to regulate the burn rate.
The convection fan outlets on the stove are covered and I have a 6" duct running into the hot air furnace plenum with a temperature sensing switch to cycle the oil furnace blower. The convection fan is on a separate rheostat, when heat is needed I set it at full speed (where it usually stays during cold weather).
Here's the question: The stove has a stainless steel loop in it for heating domestic hot water. I plan to plumb it into the oil fired 30 gal. water heater using a circulator pump. I'm working on a suitable control circuit that will run the pump only when the water temperature drops below the set point on the aquastat. That shouldn't be hard to design, but I need a way to control the burn rate on the stove, esp. during warm weather when heat is not needed. I need a control that can idle the fire to a minimum and ramp it up fast when there is a call for hot water. Can the Coal-Trol do this?
I also would like a control that can regulate the burn rate for heating as well during cold weather.
Right now I'm adjusting the carpet travel according to how much heat is required, this will never work in July and wastes coal as well.
Also, the aquastat on the water heater and oil burner will remain operational for high demand, I'm incorporating a separate aquastat to control the coal heating.

Opinions please...

Thanks,

John
BLOWER CONTROL 03-01-08.jpg
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Photo showing the stove, hot air duct, and separate blower control/switch for the oil burner fan.
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Wood'nCoal
 
Stoker Coal Boiler: 1959 EFM 350
Hand Fed Coal Stove: Harman Magnafire Mark I
Coal Size/Type: Rice and Chestnut
Other Heating: Fisher Fireplace Insert

Re: Coal-Trol Controlling Burn Rate For Water Heating

PostBy: pvolcko On: Tue Mar 04, 2008 12:16 am

On regulating for the water heating application: the Coal-trol is not designed for this purpose nor do I believe you could hack it to be all that good at it. You'd be better off with an idle timer and the aquastat to kick it into gear when heat is called for. Even then expect delays of a dozen or more minutes before the hot water coil starts transferring much heat into your domestic tank. We've had a number of requests for a boiler control in the past few years. When we get that out, that would be a much more likely fit for this application.

As for controlling the heat output for house heating purposes, Coal-trol Digital is designed precisely for that purpose. :)

Mixing the two purposes (water coil and house heating) may prove a bit tricky. I could make some guesses as to how to pull it off, but I don't know for a fact and wouldn't want to lead you astray. It is done though, so hopefully someone else can pipe up with ideas for you. And hopefully you will chose to integrate a Coal-trol into your plans. :)

If you call the shop (315-299-3589) Neil may be able to guide you better on the details of what you're wanting to do and how the Coal-trol can fit into it.
pvolcko
 

Re: Coal-Trol Controlling Burn Rate For Water Heating

PostBy: Wood'nCoal On: Tue Mar 04, 2008 7:08 am

Thanks for the fast reply!
I'm a few weeks away from being able to start work on the water heating hook-up, so I have time to figure this out.
Thanks again.
Wood'nCoal
 
Stoker Coal Boiler: 1959 EFM 350
Hand Fed Coal Stove: Harman Magnafire Mark I
Coal Size/Type: Rice and Chestnut
Other Heating: Fisher Fireplace Insert