Outdoor wood boiler problems

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Old 11-23-15, 04:01 PM
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Outdoor wood boiler problems

I have a homemade outdoor wood boiler. With a taco 007 pump. Plumbed with 1 inch pex line. The water lines run approximately 140 feet from feed to return. I have a 100,000 btu heat exchanger in my plenum of the furnace. i can only pull 90 degree hot air out of my register vents. I tried hotter water but still can only get 90 degrees. Im running 120- 145 water temp. My heat loss is about 20 degrees. Im 95% sure all the air is out. Im looking for advice on why i cant get more heat out of the vent. My propane pushes 110 to 120 degrees out of the vent. Ive wondered if i need a bigger pump? I hope i have provided enough info. Thank you for any advice
 
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Old 11-23-15, 05:12 PM
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so it's home made, we will never know what the btu it's producing.
What is the water going into the coil and the water coming out of the coil ?

If it's more than 25 degrees than you need more pump, you most likely will need to reduce the fan speed on the furnace when your on wood energy as my first guess is that you are not making enough BTU from your boiler, and this is why the air temp is cooler
 
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Old 11-23-15, 07:45 PM
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The 1" piping can carry about 70K of heat unless you really oversize the pump than the piping can make noise. The oo7 circulator looks like a good size if there is no other fittings or the duct coil. Add in these items and the 007 is too small for the 10 gpm of flow you need for your 100k heat.
My heat loss is about 20 degrees
Not sure what this means,I believe you mean delta-T and if that is correct your airflow is OK for amount of water you are moving now.
I also agree with we have no idea what the wood boiler is producing.
 
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Old 11-24-15, 03:00 PM
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I don't think the water is hot enough... but you said you tried hotter and no difference, so I don't know what's going on there.
 
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Old 11-24-15, 03:01 PM
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Plumbed with 1 inch pex line. The water lines run approximately 140 feet from feed to return.
INSULATED? and underground? Or, are you planning to have a walkway to the boiler that you don't have to shovel?
 
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Old 11-24-15, 04:00 PM
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too much air flow across a coil will net you low air temp.
So, how big is the coil, is it single row, 2 row 3 row ?

What houses the blower ? is it a modern furnace, old air handler ?

We are just guessing at this point, we don't have enough info to be definitive
 
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Old 11-24-15, 04:28 PM
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Thank you for the advice. The lines are insulated from the stove to the house and back. When the water returns back to the wood stove after going through the heat exchanger it is only about 15 to 20 degrees cooler. What i called heat loss. My furnace is a newer goodman furnace i think it is 6 years old. The radiator is a 3 row. The temp of the water entering the heat exchanger is usually about 2 degrees cooler than the water leaving the stove.
 
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Old 11-24-15, 05:59 PM
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Outdoor wood furnace

I had a outdoor wood furance for years, the first year was a learning curve. Is the exchanger putting enough heat into yourboiler? What is the boiler temp? My unit was around 170_185
 
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Old 11-24-15, 06:43 PM
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Im running 120- 145 water temp
The OP posted that in his first post.



i can only pull 90 degree hot air out of my register vents. I tried hotter water but still can only get 90 degrees
That doesn't make sense. Hotter water would have to raise the exchanger temperature.
 
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Old 11-25-15, 05:00 AM
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First thing, I would like to see the wood boiler running between 160 and 180.

The coil being 3 row will transfer a lot of heat but needs hotter water to do it.

You might need a reverse aquastat to turn the circ pump on when the boiler hits 160, or use a thermic valve to control the water flow.

Please give model number of the goodman.
 
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