wiring combustion fan to run 24/7

wiring combustion fan to run 24/7

PostBy: plumber On: Sun Mar 02, 2014 4:03 pm

I know of at least one boiler that is set up this way. If I'm not mistaken, jpen has this setup. Is that the way the early models were set up, or was that a field modification? I can see the benefits of having the fan run at minimum at idle and just the stoker off the timer. How would I accomplish this?
plumber
 
Stoker Coal Boiler: EFM 350

Re: wiring combustion fan to run 24/7

PostBy: Matthaus On: Mon Mar 03, 2014 2:36 pm

The combustion fan needs to stop during the off time to prevent overtemp, in Jpen's case he has his unit tied through another boiler to dump the heat. The best set up for idle fire on a WL110 involves as much coal as possible burning (width from front to back) with a minimum flame as accomplished by turning the combustion fan rheostat down so the flames are 1-2" at idle with the fan running. This provides a quicker recovery when the fan comes on full speed for a call for heat. If there is an issue with un-burned coal, the coal bed can be made a little narrower and the flames made a bit bigger, the issue with this setup is that after a prolonged call for heat the coal bed will be of sufficient size to overheat the boiler during idle with the larger flames. 12 gallons of water is a fickle companion when matched up to a solid fuel fire.
Matthaus
 
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

Re: wiring combustion fan to run 24/7

PostBy: Sting On: Mon Mar 03, 2014 3:11 pm

Why would you want to do this again please?
Sting
 
Other Heating: OBSO Lennox Pulse "Air Scorcher" burning NG

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Re: wiring combustion fan to run 24/7

PostBy: kstills On: Mon Mar 03, 2014 3:33 pm

Sting wrote:Why would you want to do this again please?


Not entirely sure, but plumber has had some coal issues that this might help alleviate. He's complained about moderate temps causing a lot of outfires in the past.
kstills
 
Stoker Coal Boiler: WL 110
Stove/Furnace Make: Leisure Line

Re: wiring combustion fan to run 24/7

PostBy: Flyer5 On: Mon Mar 03, 2014 4:12 pm

My boiler is stock config. I run mostly year round. I can say I have not had one out fire besides too much air in the hopper or not enough air in the ashpan. Just a matter of setup. Matt did the boilers and I was responsible for the furnaces. When I first saw this design I admit I was skeptical. So I installed one in my house. It works and works great. I also sold many friends on it as well and they are still my friends. Not saying things should never be improved but the current config works great. Even in the summer I do not hit my dump temp of 215* but standby ability is pretty fast for a solid fuel boiler. Like it was explained the setup is so that a large amount of red coals can be on the grate during idle times without producing a lot of heat. But when a zone or the aquastat calls for heat you have an almost full grate at the ready.

This is done by stopping the fans during idle off cycle and running the fan slower speeds during the idle on cycle. When the boiler calls for heat the combustion fan runs full speed and the rheostat is bypassed.
Flyer5
 
Stoker Coal Boiler: Leisure Line WL110
Hot Air Coal Stoker Stove: Leisure Line Pioneer

Re: wiring combustion fan to run 24/7

PostBy: plumber On: Thu Mar 06, 2014 3:50 pm

Sting wrote:Why would you want to do this again please?


Trying to maintain Draft in the summer, and possibly get a more complete burn. Mostly to avoid the summer out fires.
plumber
 
Stoker Coal Boiler: EFM 350

Re: wiring combustion fan to run 24/7

PostBy: Flyer5 On: Thu Mar 06, 2014 4:18 pm

What are you running for idle times?
Flyer5
 
Stoker Coal Boiler: Leisure Line WL110
Hot Air Coal Stoker Stove: Leisure Line Pioneer

Re: wiring combustion fan to run 24/7

PostBy: kstills On: Thu Mar 06, 2014 4:20 pm

plumber wrote:
Sting wrote:Why would you want to do this again please?


Trying to maintain Draft in the summer, and possibly get a more complete burn. Mostly to avoid the summer out fires.


I don't think the fan will help with draft. I've found that the new fan I have on has to be throttled back in between cleanings, as higher air flow into the burn chamber starts to negatively affect the draft going out.
kstills
 
Stoker Coal Boiler: WL 110
Stove/Furnace Make: Leisure Line

Re: wiring combustion fan to run 24/7

PostBy: Matthaus On: Mon Mar 10, 2014 1:43 am

Draft issue for summer operation are best handled with a draft inducer such as the Field Controls DI-1 that our dealers sell which has been made to operate with a speed control. Just remember this unit must be installed in the flue pipe between the barometric damper and chimney. :idea:
Matthaus
 
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

Visit Leisure Line Stove