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Old 12-21-2010, 11:18 AM   #1
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Damaged fins on furnace EVAP coil


I pulled of the evap coil panel on my furnace today to get a real good look to see if I had a plugged up coil that was popping my limit switch a couple of times the last 2 weeks. I didn't see any dirt/dust that was out of the ordinary. However I saw that someone previously must have tried to service the coil or damaged it when it was installed. Im the second owner of the house for a year now. here is the damage to the fins



My evap coil setup is like this

/\/\/\

the damge is a 2"x 3" area on this coil part

/\/\/\

The damage is towards the front. I used a fine soft bristle hair come to straighten out what i could of the fins.

Is this enough to limit air flow?

My temperature within the first 2 feet of the supply plenum is about 130 degrees.

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Old 12-21-2010, 03:52 PM   #2
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Damaged fins on furnace EVAP coil


Sounds okay. Subtract the return temp to get the temp rise Ie 130-70 = 60. Check the rating plate for allowable temp rise. You can carefully straighten those fins with a pocket screwdriver if you have patience.

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Old 12-21-2010, 03:56 PM   #3
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Damaged fins on furnace EVAP coil


Yeah. it'll be fine.
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Old 12-21-2010, 03:58 PM   #4
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Damaged fins on furnace EVAP coil


Unlike my customer who took a pressure washer to his condensor coil.
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Old 12-21-2010, 04:01 PM   #5
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Damaged fins on furnace EVAP coil


that was just not cool...
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Old 12-21-2010, 04:10 PM   #6
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Damaged fins on furnace EVAP coil


Quote:
Originally Posted by yuri View Post
Sounds okay. Subtract the return temp to get the temp rise Ie 130-70 = 60. Check the rating plate for allowable temp rise. You can carefully straighten those fins with a pocket screwdriver if you have patience.
40-70 is my heatrise. I may have just found out my short cycling problem, cracked inducer housing

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