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Old 06-23-2016, 09:13 AM   #1
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Electrician looking for some help with home AC


Hey guys, took the day off to relax (doing a lot of overtime currently) and hoping to fix or at least know what to do with my AC unit. I verified both the fan and condenser unit are running (well fan is moving and condenser is making noise) with a solid 240v on the incoming side. So the common capacitor problem is taken care of. I also swapped in a new filter (although the last one was about 2 months old) and did some dusting by the return vents. It's blowing 'cold' air but feels more like a fan blowing air coming out of my duct rather than the chilled air that comes out of a vehicles AC vents.

I'm pretty handy and can try test things out but I'm limited on specific AC tools. I'm willing to call a tech but just trying to narrow it down and fix it if I can.

Any help would be greatly appreciated! Thanks in advance!
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Old 06-23-2016, 09:32 AM   #2
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Re: Electrician looking for some help with home AC


If your compressor is running, grab the auction line at the condensor. That's the larger line of the two. Is it cold or warm? If it's warm you have a refrigerant issue.
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Old 06-23-2016, 09:44 AM   #3
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Re: Electrician looking for some help with home AC


Take a temperature reading in the supply and return duct at the furnace. Let us know.
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Old 06-23-2016, 01:19 PM   #4
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Re: Electrician looking for some help with home AC


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Originally Posted by BayouRunner View Post
If your compressor is running, grab the auction line at the condensor. That's the larger line of the two. Is it cold or warm? If it's warm you have a refrigerant issue.
The big line that runs down to my main blower or the one that runs to the coils?

The big one that runs down to my main blower is colder than ambient air but I wouldn't call it close to freezing cold. If I had to guess like 50 degrees.
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Old 06-23-2016, 01:21 PM   #5
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Re: Electrician looking for some help with home AC


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Originally Posted by Bitters View Post
Take a temperature reading in the supply and return duct at the furnace. Let us know.
I can't find my digital thermometer to get an exact reading. The return feels about ambient and the feed feels about 10 degrees cooler. Definitely doesn't feel like cold air coming out of the vents. I can't notice a difference between just the fan running and the AC being turned on.
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Old 06-23-2016, 02:37 PM   #6
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Re: Electrician looking for some help with home AC


Little confused, you have a refrigerant line running down to the blower compartment?? Check the one that goes to the evaporator coil.

Last edited by Bitters; 06-23-2016 at 02:38 PM. Reason: correction
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Old 06-23-2016, 02:56 PM   #7
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Re: Electrician looking for some help with home AC


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Little confused, you have a refrigerant line running down to the blower compartment?? Check the one that goes to the evaporator coil.
The evaporator coil line is cold to the touch outside but around 50 degrees if I had to guess. Not super cold like I would imagine it to be.

Sorry I've been doing a little bit of reading as I go and learning. I probably don't use the correct terms. When I said blower compartment I meant the air handler.
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Old 06-23-2016, 03:03 PM   #8
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Re: Electrician looking for some help with home AC


OK gotcha. Did you see any condensate on the pipe outside?
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Old 06-23-2016, 03:23 PM   #9
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Re: Electrician looking for some help with home AC


50*f suction temp is decent, without knowing the pressure.

Are you getting the usual volume of air out of the registers?

When you do find your thermometer, measure that pipe, then just before the distributor. It'll be in the air handler. (or after the txv if it's external to the air handler) Take an amp draw of the Compressor while it's running. What is the FLA/RLA on the rating plate.

Cheers!
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Old 06-23-2016, 03:26 PM   #10
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Re: Electrician looking for some help with home AC


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OK gotcha. Did you see any condensate on the pipe outside?
Negative. I have some insulation around the line after it leaves the outside unit and I pulled a little bit of that back as well to really look at it and no condensation on that either.

To further describe the temperature I would say it feels about how how your faucet tap feels during the summer as its turned to the cold setting. I imagine you would want it to feel more like winter water running through the tap feels. Close to freezing. I don't know if this is helping ha.
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Old 06-23-2016, 03:45 PM   #11
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Re: Electrician looking for some help with home AC


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50*f suction temp is decent, without knowing the pressure.

Are you getting the usual volume of air out of the registers?

When you do find your thermometer, measure that pipe, then just before the distributor. It'll be in the air handler. (or after the txv if it's external to the air handler) Take an amp draw of the Compressor while it's running. What is the FLA/RLA on the rating plate.

Cheers!
Yeah the volume is good. I swapped out the filter just to see if helped.

I've got some pictures I'm uploading now that might tell a better story.
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Old 06-23-2016, 04:35 PM   #12
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Re: Electrician looking for some help with home AC








Just a side note on this last picture that it is just one leg of the circuit so the combined current is double that reading.
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Old 06-23-2016, 04:53 PM   #13
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Re: Electrician looking for some help with home AC


Hmm.... It wont be double that reading it's just pulling 9amps.
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Old 06-23-2016, 06:31 PM   #14
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Re: Electrician looking for some help with home AC


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Hmm.... It wont be double that reading it's just pulling 9amps.
Since there is no neutral I think you're correct. The second leg ends up acting like a neutral to carry the unbalanced load back to the source. Damn it's been too long since I've been in school haha. Either way the reading is 9 amps. Does that help out at all?
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Old 06-23-2016, 06:33 PM   #15
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Re: Electrician looking for some help with home AC


Also it's 84 degrees in my house now...yuck! I'm going to message a few friends and see if they have an hvac guy they know and trust.
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