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Harpert1 04-12-2013 06:19 PM

Corrosion of condenser fins
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Hi all, new to the forum.

So I was doing a spring service of my AC system. I noticed this corrosion. How much efficiency do you reckon I'm losing? Is this something I can limp along with for a few more years before replacement?

joecaption 04-12-2013 06:38 PM

I'll let the HVAC guys comment on how long you got, but I will mention someone really messed up but just sitting it directly on the gound like that.
Even 6" stand offs would have been better then that.

Technow 04-12-2013 07:04 PM

As long as it works :)

No telling how much efficiency you lost, those holes also cause air to bypass the rest of the good fins.

You have dogs?

ben's plumbing 04-12-2013 08:17 PM


Originally Posted by Technow (Post 1157966)
As long as it works :)

No telling how much efficiency you lost, those holes also cause air to bypass the rest of the good fins.

You have dogs?

hey technow...even if he dosen't someone in the neighborhood does:laughing::laughing::laughing::laughing:

old_squid 04-12-2013 10:08 PM

If it's cooling you're good for now. For how long only depends on luck at this point.

Keep the dog AWAY from the unit, that's what is eatting up the fins on the coil. Put up a wire fence a couple feet away from it.

Very very carefully block off the opening where the fins are missing...... with what and how is up to you, but keep in mind the tubing gets hot when the AC is running. Only block off the hole where the fins are missing so that the fan will pull air through the rest of the coil.

beenthere 04-13-2013 12:27 AM

Kind of depends how many more times the dog/dogs use it for a fire hydrant.

Harpert1 04-13-2013 09:25 AM

Never thought of that. The previous owners did have a dog. I bought it as a foreclosure 3 years ago. There's been lots of fixin, add this to the list.

The unit is on a pad. But it still below grade. When I replace I'll pour another pad to raise it up.

I have a guy coming today to charge it up. I'll repost with his comments.

chitownken 04-13-2013 09:45 AM

If it lost its charge, bet i know where the leak is.

Marty S. 04-13-2013 10:32 AM

The time to think about replacement is now. Spending hundreds of dollars on that to recharge is not a wise move.

Harpert1 04-13-2013 12:27 PM

Update: the system had a full charge. He thinks the hole in the coil is the problem. I commented on a careful spray-foam fix. He wasn't buying that. He said the engineers design the condenser coil to exact specifications so the system needs exactly that much finning.

Given the fact that i had a full charge yet low side not sweating nor is system blowing cold air, I opted to replace this 20 year old system. Ouch!

Thanks for the info guys.

hvac instructor 04-13-2013 05:30 PM

if you do use it. put a peice of sheet metal to block the airflow from going
thru where there is no fins

Harpert1 04-16-2013 06:51 PM

Update for you guys- Installed a Rheem value model 13AJN 13 SEER condensing unit and a new evap coil.

Our contract said a new 3/8 inch line, but he didn't install it. I called him on this and he said it didn't need to be replaced as it is a 13 SEER unit (if it was a 15 SEER unit, he said he would have).

Hmmm.... What think you guys?

beenthere 04-16-2013 07:44 PM

3 ton or bigger needs a 3/8" line.

COLDIRON 04-17-2013 06:06 AM

If it's in the contract it's legally binding and he should have installed the system as specified.
If he didn't he either needs to subtract a fair price for the value of the work not completed and give you back a refund for that portion of the job or do the work.
Please be careful if you need the Contractor to respond to warranty work or a no cooling call you might regret holding him exactly to the contract.

Not saying he would somehow be evil but people are people and they don't get mad they get even.

I would recheck everything to make sure the Contractor did install everything as specified.

ben's plumbing 04-17-2013 05:48 PM

what size is the liquid line.....that he did not change it...or did i miss that

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