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Old 07-01-2015, 04:19 PM   #1
treestand
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Default A/C compressor noise

About one of 20 starts, my home A/C outside unit emits a loud growling type of noise for 10 - 30 seconds. I'm thinking the compressor is going out. Any thoughts?
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Old 07-01-2015, 05:20 PM   #2
krisw
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Might need a hard start kit or whatever they are called now.
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Old 07-01-2015, 05:23 PM   #3
Puggy625
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Mine has done that for the last 4 years at least. Once it's running, it's normal. Just sounds like it's about to blow for a few seconds. I put a hard start kit on it when it first started with no help. Just figured I'll wait for it to die and then replace the compressor.
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Old 07-01-2015, 05:30 PM   #4
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Could just be the position of the txv upon startup. Once it adjusts, the noise will subside. This may or may not be helped with the addition of a start kit. but if it does have a txv, it should have a start kit, so it wouldn't hurt to install one anyway.

Or the end is near. How old is it?
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Old 07-01-2015, 06:53 PM   #5
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Quote:
Originally Posted by bowhntrmatt View Post
Could just be the position of the txv upon startup. Once it adjusts, the noise will subside. This may or may not be helped with the addition of a start kit. but if it does have a txv, it should have a start kit, so it wouldn't hurt to install one anyway.

Or the end is near. How old is it?
What is a txv?

It's a scroll compressor and about 7 or 8 years old.
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Old 07-01-2015, 07:15 PM   #6
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You missing a cat?
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Old 07-01-2015, 07:21 PM   #7
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Quote:
Originally Posted by bowhntrmatt View Post
Could just be the position of the txv upon startup. Once it adjusts, the noise will subside. This may or may not be helped with the addition of a start kit. but if it does have a txv, it should have a start kit, so it wouldn't hurt to install one anyway.

Or the end is near. How old is it?
I concur ! While an expansion valve is fantastic to have for the efficiency value, it can cause a condensing unit to make some odd noises when it is short-cycled.

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What is a txv?

It's a scroll compressor and about 7 or 8 years old.
A TXV ( thermostatic expansion valve ) is a metering device in the refrigerant circuit, normally located on or near the evaporator coil on a residential a/c system.
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Old 07-01-2015, 07:38 PM   #8
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Is it a heat pump? Could be a reversing valve/defrost board acting up.
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Old 07-01-2015, 07:40 PM   #9
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Sounds like the new Copeland tiger model. LOL
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Old 07-01-2015, 07:42 PM   #10
Uncle Saggy
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Quote:
Originally Posted by krisw View Post
Might need a hard start kit or whatever they are called now.

Hard start kit = time for new unit
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Old 07-01-2015, 07:46 PM   #11
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Could be as simple as a fan bearing starting to seize. Not that big of a problem. New fans are simple to replace
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Old 07-01-2015, 07:46 PM   #12
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If it has not been doing this it could also , what we call eating liquid. Not enough air flow across the coil. Dirty filter. This will cause the compressor to flood so on start up it has liquid freon on the top of compressor. So on start up it will sound like a desiel.

This is just one problem. There have been others already given
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Old 07-01-2015, 07:55 PM   #13
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If it has not been doing this it could also , what we call eating liquid. Not enough air flow across the coil. Dirty filter. This will cause the compressor to flood so on start up it has liquid freon on the top of compressor. So on start up it will sound like a desiel.

This is just one problem. There have been others already given

30 years in the industry and never heard the phrase "eating liquid"
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Old 07-01-2015, 08:09 PM   #14
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Quote:
Originally Posted by Uncle Saggy View Post
30 years in the industry and never heard the phrase "eating liquid"
Must be a west Texas thang. How about slugging liquid.

Could be a new phrase. I've only been in it for 24 years. I still remember charging a unit to beer cold. On the suction line

Last edited by enewman; 07-01-2015 at 08:12 PM.
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Old 07-01-2015, 08:13 PM   #15
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Must be a west Texas thang. How about slugging liquid.

Could be a new phrase. I've only been in it for 24 years. I still remember charging a unit to beer cold. On the suction line

Lol

Charge until the big temp drop on the suc line

I understand
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Old 07-01-2015, 08:15 PM   #16
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How about using 30 pounders of 22 and 12 to chill cases of beer?
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Old 07-01-2015, 08:19 PM   #17
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Quote:
Originally Posted by Uncle Saggy View Post
How about using 30 pounders of 22 and 12 to chill cases of beer?
Dang right !!! Folks talk about beer being cold enough to drink after 7 minutes in a cooler full of ice, us old refer hands can show you how to freeze a case in less that 3 minutes
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Old 07-01-2015, 08:20 PM   #18
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Dang right !!! Folks talk about beer being cold enough to drink after 7 minutes in a cooler full of ice, us old refer hands can show you how to freeze a case in less that 3 minutes

Took you 3 minutes?



Lmao
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Old 07-01-2015, 08:22 PM   #19
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Quote:
Originally Posted by enewman View Post
Must be a west Texas thang. How about slugging liquid.

Could be a new phrase. I've only been in it for 24 years. I still remember charging a unit to beer cold. On the suction line

But you stoldt Sparkys Zebra







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Old 07-01-2015, 08:29 PM   #20
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Quote:
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But you stoldt Sparkys Zebra







Hehe yes I did. And he ate great
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Old 07-01-2015, 08:31 PM   #21
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Hehe yes I did. And he ate great

Freaking awesome!!!!!! #fsparky
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Old 07-01-2015, 08:58 PM   #22
peachykeeli
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check the capacitor or start kit
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Old 07-01-2015, 09:12 PM   #23
krisw
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Quote:
Originally Posted by Uncle Saggy View Post
Hard start kit = time for new unit
Nah, I have seen them run a while with them. I will say that when we used to put them on, it seemed like it would die within a couple of years.
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Old 07-01-2015, 09:16 PM   #24
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Quote:
Originally Posted by Uncle Saggy View Post
Took you 3 minutes?



Lmao
Yep, from the time I got the refrigerant drum to the time I was drinking a beer
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Old 07-01-2015, 09:22 PM   #25
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Originally Posted by krisw View Post
Nah, I have seen them run a while with them. I will say that when we used to put them on, it seemed like it would die within a couple of years.
That seems funny. Lot of units come with hard starts from the factory.

But that is not his problem. He never said the compressor never not comes on. He is stating that it makes a noise when starting up some times. That is not a capacitor problem.

If a compressor on start up sounds like a desiel engine for a short time it normally means it has liquid in the compressor.

To the op. After the unit is running for a short time go look at the compressor. The suction line. Big one should be sweating. But the compressor should not. If the compressor is sweating you are running in a flooded state.

You need to get a tech out.

Again this is just one of several problems.

Last edited by enewman; 07-01-2015 at 09:29 PM.
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Old 07-01-2015, 09:25 PM   #26
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Yep, from the time I got the refrigerant drum to the time I was drinking a beer

Lol
Love it!
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