laars mini therm flame too high

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  #1  
Old 01-21-12, 06:43 AM
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laars mini therm flame too high

i have a laars propane mini therm boiler that i use as a backup to my wood fired boiler. I ran out of wood and was using the mini therm. It ran for several days until one night the co alarm went off. I went down to check and there were flames pouring out of it so i of course turned it off.
I talked to a heating repair guy and he said to replace the controller which i did. While changing the controller i thoroughly cleaned the burners and looked for any problems which there were none that i could tell. Fired up the boiler and nothing changed.
The pilot light seems to be burning too high and when the boiler ignites the flames are way too high and pour out the front of the unit. It seems the gas pressure is too high so the only other thing i could think of was too much pressure entering the controller so i replaced the secondary regulator coming into the house. That didn't help either.
Can anyone give me some suggestions? I live way out in the bush and a repairman wont come out here. I would have to tear the boiler out and haul it to town to have it fixed and if past experience is an indicator the #%*! thing would probably work fine in thier shop.
 
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Old 01-21-12, 07:29 AM
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Is there anything blocked in the flue or chimney?

By controller do you mean the gas valve?

You need to borrow gas pressure gauge and check the pressures.

Peter
 
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Old 01-21-12, 07:34 AM
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Another thought.

You might have to take the thing out.
I believe that has a copper fin heat exchanger.
They are kown to get clogged up easily, especially with propane.
Once they get sooted/clogged up,
i have read the only way to get them cleared out, is to take out the heat exchanger, bring it to a car wash and blast the junk out.
Unless you have a pressure washer out in the garage.

Good luck, hope that's not the problem,

Peter
 
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Old 01-21-12, 08:39 AM
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dirty exchanger

Looks like it could be the problem. Now i have to figure out how to get them out to clean them. Thanks for the tip.
 
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