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Old 08-05-2011, 01:55 PM   #1
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AC guy vs. AC guy - who's right?


Hi All - I called a company out and the guy was very, very nice. He cleaned our coil and said that the head pressure was 425psi and that the compressor was making a ticking noise. He said that the reason our AC isn't running as efficiently as it once was is because he thought there was a restriction somewhere. He added a new hard start and it didn't make much difference. He said we're going to need a new compressor and to call our warranty company to see if they could help, and if they couldn't, he'd come back out and do it.
Warranty HVAC guy comes out today and is here now. He said that the system has just been overcharged and that if he pulls out a couple of pounds of freon, we should be good to go. He said that whoever serviced it prior to our buying the house put too much in and that's why the compressor is struggling.

Who do I trust, here? We're in this Texas heat wave and I really want to make sure that we're doing the right thing. Clearly I don't want to replace a compressor without really needing it, but I also don't want the unit to die in the middle of the heat with three babies in the house. Warranty guy says it may be an extra $50 over our copay, but the compressor should be fine. Other guy says it'll be $2500 IF the unit doesn't die today. Help!

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Old 08-05-2011, 02:06 PM   #2
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AC guy vs. AC guy - who's right?


There is not enough information to know for sure......

Is there any other data from the service tickets?

425 is way too high for r22 or r410
Hardstarts don't do anything if the compressor is running.

It might die if the 425psig is not taken care of.

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Old 08-05-2011, 02:08 PM   #3
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AC guy vs. AC guy - who's right?


What should the psi be for r22 or r410?
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Old 08-05-2011, 02:11 PM   #4
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AC guy vs. AC guy - who's right?


I found this on my invoice from guy #1:

Suction pressure: 65
Suction line temp: 56
SAT Temp: 35
Superheat 21
Liquid Line Pressure - 425+
"Head pressure climbed steadily to 425 psi before pressure valve kicked it off - compressor has been replaced before no driers installed."
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Old 08-05-2011, 02:21 PM   #5
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AC guy vs. AC guy - who's right?


Guy #2 said that he took out 2lbs r22 and the pressure went down to 310 immediately. He said that the compressor is a little noisy but nothing bad. I feel like a 2 pound weight has been lifted from my shoulders.
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Old 08-05-2011, 02:23 PM   #6
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AC guy vs. AC guy - who's right?


did #2 write down any other numbers? New suction pressure? etc.
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Old 08-05-2011, 02:26 PM   #7
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AC guy vs. AC guy - who's right?


310/68, 36/66 = SH (or SA - sloppy writing), 118/133=15sc, 80/58=22deg TD, compressor better, condenser clean.

I have no idea what to make of that.
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Old 08-05-2011, 03:18 PM   #8
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AC guy vs. AC guy - who's right?


Quote:
Originally Posted by wmdcookes View Post
310/68, 36/66 = SH (or SA - sloppy writing), 118/133=15sc, 80/58=22deg TD, compressor better, condenser clean.

I have no idea what to make of that.

Me neither ...any other numbers? how hot was it today? I am leaning toward the #2 guy......and its the first time I am leaning toward a home warranty company contractor He got the numbers closer....I don't think there is a restriction, but they are not quite right...close....
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Old 08-05-2011, 03:30 PM   #9
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AC guy vs. AC guy - who's right?


It's about 109 today- no end in sight!
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Old 08-05-2011, 04:11 PM   #10
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AC guy vs. AC guy - who's right?


Guy #2 keep it running and see what happens. Be prepared for problems down the road if the compressor was replaced and no driers are in sight.

I wouldn't let #1 back in my house.
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Old 08-05-2011, 04:49 PM   #11
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AC guy vs. AC guy - who's right?


IMO you have problems with the indoor coil,possibly a partially restricted orifice . A 30 degree superheat when it's over 100 out is much too high. Somebody overcharged it to get that number more on target and it showed up with the extreme temps. I wouldn't be surprised if the compressor overheats now.
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Old 08-05-2011, 05:05 PM   #12
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AC guy vs. AC guy - who's right?


grab the copper line out of the condenser with the compressor running and tell us what it feels like...and the days temps might need some gas still removed...if the compressor was changed due to a burn out then the ACID question comes into the picture was it cleaned out but no dryer installed makes the tech wonder ..stick with #2 tech...check for 18F at the air handler between the return and the supply if you can read it..
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Old 08-05-2011, 05:21 PM   #13
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AC guy vs. AC guy - who's right?


I'm thinking improper airflow. Could be a dirty evaporator, too many registers closed, inadequate ductwork etc. and the system was overcharged to compensate for evaporator icing. Seen it too many times. Just my opinion, could be wrong.
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Old 08-05-2011, 06:12 PM   #14
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AC guy vs. AC guy - who's right?


A dirty evap would give him a low super heat.

May indeed have a restriction n ear the metering device, if there are no filters in the system. but that is not a reason to change out a compressor,.

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