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central a/c compressor not turning on
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reader
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PostPosted: Mon Jun 13, 2005 12:02 am    Post subject: central a/c compressor not turning on Reply with quote

Question to the cooling gurus here:

The compressor for my central a/c system isn't turning on. The fan inside
the compressor housing runs, there is 230V coming out of the contactor and
going to the compressor, and there is 24V coming to the contactor from the
thermostat.

Is this a symptom of a compressor gone bad, or could it be caused by low
freon in the system?

Thanks
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HvacTech2
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PostPosted: Mon Jun 13, 2005 12:02 am    Post subject: central a/c compressor not turning on Reply with quote

Hi reader, hope you are having a nice day

On 12-Jun-05 At About 18:06:27, reader wrote to All
Subject: central a/c compressor not turning on

r> From: "reader" <reader@swbell.net>

r> Question to the cooling gurus here:

r> The compressor for my central a/c system isn't turning on. The fan
r> inside the compressor housing runs, there is 230V coming out of the
r> contactor and going to the compressor, and there is 24V coming to the
r> contactor from the thermostat.

r> Is this a symptom of a compressor gone bad, or could it be caused by
r> low freon in the system?

It could be a bad compressor but it needs to be checked to verify this. you
should call a local company to verify everything



-=> HvacTech2 <=-


... "A friend of mine is in jail for counterfeiting pennies..."- s.w.

___ TagDude 0.92+[DM]
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
spam protection measure, Please remove the 33 to send e-mail
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reader
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PostPosted: Mon Jun 13, 2005 12:03 am    Post subject: Re: central a/c compressor not turning on Reply with quote

"Dr. Hardcrab" <drhardcrab@hotmail.SPAMcom> wrote in message
news:PN3re.2357$kj5.272@trnddc03...
Quote:

"reader" <reader@swbell.net> wrote in message
news:Td3re.291$Nz2.144@newssvr11.news.prodigy.com...
Question to the cooling gurus here:

The compressor for my central a/c system isn't turning on. The fan inside
the compressor housing runs, there is 230V coming out of the contactor
and going to the compressor, and there is 24V coming to the contactor
from the thermostat.

Is this a symptom of a compressor gone bad, or could it be caused by low
freon in the system?

Could be several things. One being burnt wire going to compressor, bad
capacitor, compressor locked up. You are best to have someone to look at
it. If it's more that 12 years old, you may want to consider getting a new
one........

It's no more than 7-8 years old, the wiring is in good condition. Would low
freon in the system prevent this compressor to turn on? Does it have a
pressure switch built in?

It's a Lennox Elite Series HS29-036-1P
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Dr. Hardcrab
Guest





PostPosted: Mon Jun 13, 2005 12:03 am    Post subject: Re: central a/c compressor not turning on Reply with quote

"reader" <reader@swbell.net> wrote in message
news:Td3re.291$Nz2.144@newssvr11.news.prodigy.com...
Quote:
Question to the cooling gurus here:

The compressor for my central a/c system isn't turning on. The fan inside
the compressor housing runs, there is 230V coming out of the contactor and
going to the compressor, and there is 24V coming to the contactor from the
thermostat.

Is this a symptom of a compressor gone bad, or could it be caused by low
freon in the system?

Could be several things. One being burnt wire going to compressor, bad
capacitor, compressor locked up. You are best to have someone to look at it.
If it's more that 12 years old, you may want to consider getting a new
one........
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Stretch
Guest





PostPosted: Mon Jun 13, 2005 1:01 am    Post subject: Re: central a/c compressor not turning on Reply with quote

Lennox HS29-036 is a 3-ton, 11 to 12 SEER AC. It could be a wire burnt
off the compressor or a bad capacitor, If the compressor shell is hot,
most likely the compressor overheated and the internal overload is
open. If the compressor overheated, could be a stuck compressor, bad
capacitor or low Freon (Freon cools the compressor motor). It could
also be bad windings. Charging a system is beyond most homeowners,
requires EPA certification to do it legally.

Stretch
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Dr. Hardcrab
Guest





PostPosted: Mon Jun 13, 2005 1:01 am    Post subject: Re: central a/c compressor not turning on Reply with quote

"reader" <reader@swbell.net> wrote in message
news:kY3re.307$Nz2.85@newssvr11.news.prodigy.com...
Quote:

"Dr. Hardcrab" <drhardcrab@hotmail.SPAMcom> wrote in message
news:PN3re.2357$kj5.272@trnddc03...

"reader" <reader@swbell.net> wrote in message
news:Td3re.291$Nz2.144@newssvr11.news.prodigy.com...
Question to the cooling gurus here:

The compressor for my central a/c system isn't turning on. The fan
inside the compressor housing runs, there is 230V coming out of the
contactor and going to the compressor, and there is 24V coming to the
contactor from the thermostat.

Is this a symptom of a compressor gone bad, or could it be caused by low
freon in the system?

Could be several things. One being burnt wire going to compressor, bad
capacitor, compressor locked up. You are best to have someone to look at
it. If it's more that 12 years old, you may want to consider getting a
new one........

It's no more than 7-8 years old, the wiring is in good condition. Would
low freon in the system prevent this compressor to turn on? Does it have a
pressure switch built in?

How do you know the wiring is good? Did you "open up" the compressor to see
if all the wires were secure on the terminals? Seen many a wire that was
"burned" off the terminal (mostly due to loose connection) and that will
keep the compressor from coming on.

Yes, most models have a high and low pressure "limit" that will keep the
compressor from coming on if the refrigerant level gets too high or low.
Sometimes those limit switches can go bad, too (with the same results). If
the capacitor is bad, it will do the same thing.. Most have dual capacitors
and if it's bad, either the fan or compressor or neither will come on.

Ask your friends or neighbors who they would call if they had a problem with
their unit. Call them early in the day and have them come out during regular
business hours and the bill will be less painful.....
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Stormin Mormon
Guest





PostPosted: Mon Jun 13, 2005 1:01 am    Post subject: Re: central a/c compressor not turning on Reply with quote

I doubt t here is a pressure switch -- perhaps a high pressure cutoff. Since
there is 220 VAC to the compressor, that's aparently not a concern. A
pressure switch would more likely prevent the AC to the compressor.

What's the amperage? I'm thinking either locked compressor (entire
compressor needs replacing) or bad run capacitor.

--

Christopher A. Young
Learn more about Jesus
www.lds.org
www.mormons.com


"reader" <reader@swbell.net> wrote in message
news:kY3re.307$Nz2.85@newssvr11.news.prodigy.com...


It's no more than 7-8 years old, the wiring is in good condition. Would low
freon in the system prevent this compressor to turn on? Does it have a
pressure switch built in?

It's a Lennox Elite Series HS29-036-1P
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reader
Guest





PostPosted: Mon Jun 13, 2005 2:02 am    Post subject: Re: central a/c compressor not turning on Reply with quote

"Stretch" <sixfoot7@sccoast.net> wrote in message
news:1118623003.266109.232940@o13g2000cwo.googlegroups.com...
Quote:
Lennox HS29-036 is a 3-ton, 11 to 12 SEER AC. It could be a wire burnt
off the compressor or a bad capacitor, If the compressor shell is hot,
most likely the compressor overheated and the internal overload is
open. If the compressor overheated, could be a stuck compressor, bad
capacitor or low Freon (Freon cools the compressor motor). It could
also be bad windings. Charging a system is beyond most homeowners,
requires EPA certification to do it legally.

Stretch


Here's an update:

I left the system off for a couple of hours, and turned it back on this
evening. It's running now and cooling.

So, I would guess the heat during the day (over 90 deg F.) and low freon
caused the compressor to overheat, and the overload switch opened. Do you
guys agree?

I'll have it serviced tomorrow and checked for the leak location.
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reader
Guest





PostPosted: Mon Jun 13, 2005 3:01 am    Post subject: Re: central a/c compressor not turning on Reply with quote

Quote:
How do you know the wiring is good? Did you "open up" the compressor to
see if all the wires were secure on the terminals? Seen many a wire that
was "burned" off the terminal (mostly due to loose connection) and that
will keep the compressor from coming on.

Yes, I opened the housing and checked all terminals. No corrosion or loose
wires. Unless you meant the motor winding was burnt - that I couldn't check
obviously.
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reader
Guest





PostPosted: Mon Jun 13, 2005 3:01 am    Post subject: Re: central a/c compressor not turning on Reply with quote

Quote:
What's the amperage? I'm thinking either locked compressor (entire
compressor needs replacing) or bad run capacitor.


I didn't measure the amperage. It's running now (cooled off in the evening),
so it's not locked up.

What's the prodcedure for checking the capacitor?
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Stormin Mormon
Guest





PostPosted: Mon Jun 13, 2005 4:02 pm    Post subject: Re: central a/c compressor not turning on Reply with quote

Switch off power, and then remove the cap. Use a VOm that has a scale for
farads.

Since it seems to over heat, perhaps your system isn't releasing heat as
efficiently as possible.

Heating up and dying is one of the variations of "locked up".

--

Christopher A. Young
Learn more about Jesus
www.lds.org
www.mormons.com


"reader" <reader@swbell.net> wrote in message
news:oR5re.333$Nz2.261@newssvr11.news.prodigy.com...

Quote:
What's the amperage? I'm thinking either locked compressor (entire
compressor needs replacing) or bad run capacitor.


I didn't measure the amperage. It's running now (cooled off in the evening),
so it's not locked up.

What's the prodcedure for checking the capacitor?
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Stormin Mormon
Guest





PostPosted: Mon Jun 13, 2005 4:02 pm    Post subject: Re: central a/c compressor not turning on Reply with quote

Disconnect power. Disconnect wires from compressor. Test with VOM on "ohms"
setting. A HVAC tech can check this.

Sounds like you're about at the limit of your training. How abotu call a
HVAC repairman?

--

Christopher A. Young
Learn more about Jesus
www.lds.org
www.mormons.com


"reader" <reader@swbell.net> wrote in message
news:8P5re.332$Nz2.14@newssvr11.news.prodigy.com...
Quote:
How do you know the wiring is good? Did you "open up" the compressor to
see if all the wires were secure on the terminals? Seen many a wire that
was "burned" off the terminal (mostly due to loose connection) and that
will keep the compressor from coming on.

Yes, I opened the housing and checked all terminals. No corrosion or loose
wires. Unless you meant the motor winding was burnt - that I couldn't check
obviously.
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bubba
Guest





PostPosted: Mon Jun 13, 2005 5:05 pm    Post subject: Re: central a/c compressor not turning on Reply with quote

Quote:
What's the prodcedure for checking the capacitor?

Switch off power, and then remove the cap. Use a VOm that has a scale for
farads.

actually, no

a capacitor with high leakage may check good this way and still be bad
just replace the capacitor, it is easy, the capacitor is likely worn out,
and they only cost about $8 at Johnstone
bring the old one with you to match up, and make a drawing of what wires
went where, colors, etc. before removing old one.

PS - a capacitor can shock the hell out of you, short terminals with a
screwdriver after removal, and wear latex gloves during removal


Quote:
Heating up and dying is one of the variations of "locked up".


no, "locked up" is locked up! a locked compressor won't be running ever
again unless it is rebuilt

I vote that the capacitor is the likely culprit
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PrecisionMachinisT
Guest





PostPosted: Mon Jun 13, 2005 5:06 pm    Post subject: Re: central a/c compressor not turning on Reply with quote

"Stormin Mormon" <cayoung61-#spamblock*-@hotmail.com> wrote in message
news:tBhre.11625$g5.43@twister.nyroc.rr.com...
Quote:
Switch off power, and then remove the cap. Use a VOm that has a scale for
farads.


You dont have a vom with a scale reading in Farads, and doubtfull youve ever
seen a cap as large as 1 farad.

Set to midrange ohms and watch for needle swing....after initial charge-up
it will swing twice as far on reversal of the leads until you discharge the
cap.


Quote:
Since it seems to over heat, perhaps your system isn't releasing heat as
efficiently as possible.

Heating up and dying is one of the variations of "locked up".


SVL
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Dr. Hardcrab
Guest





PostPosted: Mon Jun 13, 2005 5:06 pm    Post subject: Re: central a/c compressor not turning on Reply with quote

"Stormin Mormon" <cayoung61-#spamblock*-@hotmail.com> wrote in message
news:tBhre.11625$g5.43@twister.nyroc.rr.com...
Quote:
Switch off power, and then remove the cap. Use a VOm that has a scale for
farads.

Since it seems to over heat, perhaps your system isn't releasing heat as
efficiently as possible.

Heating up and dying is one of the variations of "locked up".

I had a dog once........

;-]
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