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Hot Time in the Summer - New AirCon Unit?
None | 06/21/12 | GRRRRR

Posted on 06/21/2012 4:37:32 PM PDT by GRRRRR

It is summer for sure. Colorado is experiencing 90-100 degree F days in the north east plains. Forest fires, high winds and dust complicate the time we can have the windows open as even at 80Deg in the house, the low humidity makes it comfy.

The Carrier AC unit for this house (3,500+sq ft, 4BR, high ceilings) has had issues since I moved in. Refrigerant leaks and an electrical issue. Now, with the heat of the summer coming back, the AC unit can't keep up again.

I've cleaned the unit outside, replaced the inside filter and am still getting some freeze up on the line going into the plenum.

Air temp coming out varies from 60-70 DegF.

I think the unit is under rated. Can't find out what tonnage it is either. Model is 24AB300 which I can't find either.

So, what's the best AC unit out there? Trane, Carrier, Lennox or ??

Pricing on line ranges from $3-$8K as defined by size and install costs...LOL!

Finally, would they have to replace the exchanger in the furnace too?

Thoughts? Tks. G.


TOPICS: Chit/Chat
KEYWORDS: airconditioners; airconditioning; cooling; heat; hvac; summer; vanity

1 posted on 06/21/2012 4:37:40 PM PDT by GRRRRR
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To: GRRRRR

I live in Florida, where your A/C is a matter of life and death, and I will only buy Trane.

3500+ sq ft??? Are you the governor of Colorado? :-)


2 posted on 06/21/2012 4:48:01 PM PDT by Bryanw92 (Sic semper tyrannis)
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To: Bryanw92

Thanks, naw...I finished of the basement, it’s pretty big...


3 posted on 06/21/2012 4:50:28 PM PDT by GRRRRR (He'll NEVER be my President, FUBO! Treason is the Reason! Impeach the Kenyan)
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To: GRRRRR

What exactly do you mean by a freeze-up? And how did you determine that?


4 posted on 06/21/2012 4:51:01 PM PDT by Kirkwood (Zombie Hunter)
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To: Kirkwood

Hey ! The coolant line to the furnace has about 8 inches of bare copper pipe and ice freezes on the outside surface.

The outside unit copper pipe was missing some insulation (FIXED) and it had solid ice on it too.

Today, reached 98DegF and the air output temp at the register was running 61-65 DegF. Pretty decent I guess..

G


5 posted on 06/21/2012 4:53:55 PM PDT by GRRRRR (He'll NEVER be my President, FUBO! Treason is the Reason! Impeach the Kenyan)
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To: GRRRRR

Make sure the registers are NOT wide open.


6 posted on 06/21/2012 4:59:52 PM PDT by Hoosier-Daddy ( "It does no good to be a super power if you have to worry what the neighbors think." BuffaloJack)
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To: GRRRRR

Freeze-ups usually indicate it is large of a system. It is cooling too fast, so it runs too little, and this prevents the humidity from being taken out of the air. You could probably add an extra dehumidifier in the house and this could help. I would also run ceiling fans to help circulate the air.

I have a large house like you have and have a 5 ton and a 2 ton. The 5 ton is a Trane (put in in 2006) that takes care of most of the house and the 2 ton is a Carrier that covers the bedrooms at night. Both are good systems, but I might replace the Carrier with a Trane if it ever breaks down. When I put in the Trane I replaced the entire system with new including all of the lines and the condenser because I didn’t want to be dealing with pinhole leaks.


7 posted on 06/21/2012 4:59:52 PM PDT by Kirkwood (Zombie Hunter)
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To: GRRRRR

Hubby and I own a HVAC company, but Chattanooga is a little far for us to make a service call :/

Hubby says the inside coil needs to be cleaned, its in a closet or the attic, you need to open the unit and clean them. A slant coil is easy to see / an A frame will have a panel you have to remove to clean. A HVAC parts house like CC Dickson should sell you a bottle of Green coil cleaner. Put some in a pump up sprayer and clean it up. If this still has the lines freezing up, call a service company to check freon levels, and MAKE them leak detect or add a stop leak sealant to the line set... Some service companies make lots of money ripping homeowners off not fixing leaks

The tonnage is is hidden in the model number, its 2 1/2 tons . This unit would work for about half your house. The unit is terribly undersized for 3,500 sq ft. This would not cool your whole home even working at top performance

I will answer anyones AC questions...


8 posted on 06/21/2012 5:02:19 PM PDT by backinthefold
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To: Kirkwood

Great info, thanks very much from a fellow Zombie Hunter @5.56

G


9 posted on 06/21/2012 5:02:27 PM PDT by GRRRRR (He'll NEVER be my President, FUBO! Treason is the Reason! Impeach the Kenyan)
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To: GRRRRR

Sorry... I meant to say that I think you have too large of a system installed now.

Also check your drains. If it is pulling out water, it needs to go outside the house by a drain. If water just sits in the tray inside your house, it causes problems with both comfort and freezups due to excess humidity.


10 posted on 06/21/2012 5:04:23 PM PDT by Kirkwood (Zombie Hunter)
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To: backinthefold

Hey, thank you, but I don’t have such a coil set-up. I can pull off the side panel and will look the plenum coil.

We’ll see how it does now with the clean filter etc. over the weekend we’re targeting 102 or more!!

G


11 posted on 06/21/2012 5:05:29 PM PDT by GRRRRR (He'll NEVER be my President, FUBO! Treason is the Reason! Impeach the Kenyan)
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To: Kirkwood

I thought so1 Excellent observation on the water...it is putting out water to the drain located in the dedicated utility room.

G


12 posted on 06/21/2012 5:07:33 PM PDT by GRRRRR (He'll NEVER be my President, FUBO! Treason is the Reason! Impeach the Kenyan)
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To: GRRRRR

Checked the coolant pressure? Mine used to freeze up when the freon got low.


13 posted on 06/21/2012 5:08:15 PM PDT by ArmstedFragg (hoaxy dopey changey)
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To: Kirkwood

~~I meant to say that I think you have too large of a system installed now~~

The unit is undersized for the size of his house...

When you replaced your unit in 06, if the refrigerant type was changed from R-22 to R-410A, the line sets would have to be changed...


14 posted on 06/21/2012 5:10:21 PM PDT by backinthefold
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To: Kirkwood

OK if you only have 2.5 tons, it is too small and not able to pull out enough humidity. There is an optimum size for a system and if it is too small or too large, you will have humidity issues. You need to find the sweet spot for your space.

I spent $5000 for a complete 5 ton Trane Puron system plus larger ducting in the house and a heating system. I think it is 16 SEER. The price included installation in 2006. I’m not sure what it would cost now.


15 posted on 06/21/2012 5:13:23 PM PDT by Kirkwood (Zombie Hunter)
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To: Hoosier-Daddy
Make sure the registers are NOT wide open.

Actually, that is exactly the opposite of what an HVAC guy will tell you - if you have a sufficient unit to cover your square footage.

In addition to lessening whole-house cooling efficiency, you're at risk of blowing out some of the ductwork, if you go around closing off unused rooms.

16 posted on 06/21/2012 5:13:32 PM PDT by ErnBatavia (A conservative, a liberal and a moderate walked into a bar; barkeep said "Hi Mitt")
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To: GRRRRR

One last thing...

~~So, what’s the best AC unit out there? Trane, Carrier, Lennox or ??~~

Overrated... we install Nordyne equipment, made in America, 10 year warranty, and good quality equipment


17 posted on 06/21/2012 5:14:49 PM PDT by backinthefold
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To: ErnBatavia

~~Actually, that is exactly the opposite of what an HVAC guy will tell you - if you have a sufficient unit to cover your square footage.~~

Bingo! This HVAC gal agrees with you


18 posted on 06/21/2012 5:17:08 PM PDT by backinthefold
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To: backinthefold

That’s right. I was going to service the old system at first but after I got an estimate, I just told them to replace everything with new.


19 posted on 06/21/2012 5:19:56 PM PDT by Kirkwood (Zombie Hunter)
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To: GRRRRR

There are a couple reasons why the line set freezes up. If there is not enough air flow through the coils, the line set will freeze. Check your air return to make there are no blockage.

The other problem is a faulty TXV valve.

Thats all i know. I am on the commercial side so my advice might be skewed.


20 posted on 06/21/2012 5:21:54 PM PDT by Psycho_Runner (I never voted for change, I prefer folding money.)
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To: GRRRRR

24AB300 This does not look like the entire model number for a Carrier. If it is a 2.5 ton it is too small for the house. It was most likely sized for the house before you finished the basement. Close the basement ducts and only try to cool the main living area. Do not use one of the pleated filters as they are too thick and restrict air flow. Use the cheap old fashion filter and change it more often.


21 posted on 06/21/2012 5:23:08 PM PDT by virginia lurker
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To: GRRRRR
Thanks for the thread! I have a TRANE and it too shows some freeze-up occasionally. It's a bit over-engineered for my little place in northern Idaho and isn't often needed - we had our first warm day of the year today at a blistering 85 Fahrenheit and a lot of us were checking the aircon for the first time in awhile.

I did discover a secret to running the auto air conditioner efficiently when I was ten miles down the road and sweating.

It has to be turned on.

BTT

22 posted on 06/21/2012 5:27:34 PM PDT by Billthedrill
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To: GRRRRR

did a cross check closest i could come was

24ABB3 Comfort™ 13

Air Conditioner
with Puron® Refrigerant
1.5 to 5 Nominal tons

Carrier Comfort™ 13 Air Conditioner with Puron Refrigerant, Model 24ABB3, is available in 1.5-5 ton nominal-sized units.

Standard Features

Energy Efficiency
13 SEER / 11 EER
Sound
Sound as low as 74 dBA with accessory sound blanket
Reliability, Quality and Durability
Scroll Compressor
Field-installed Filter Drier
Front-seating Service Valves
Internal Pressure-Relief Valve
Internal thermal overload
Baked-on powder paint
Dense wire coil guard—Standard

Natural for them to freeze up in high use situations thats why they cover them with insulation but it could mean also you have a vacuum leak and are pulling moist air into the system if sot the compressor will freeze up and it wont work at all if it ws built in the 70 or 80 id get a new one replace the whole system i like carrier but i like trane better they see\m to last longer and have a heavier duty on off cycle

was the house built onto since this unit was installed ? if so it might be overworked !


23 posted on 06/21/2012 5:32:28 PM PDT by ATOMIC_PUNK (Any man may make a mistake ; none but a fool will persist in it . { Latin proverb })
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To: ATOMIC_PUNK

Hey AP, thanks man, good to hear ya!

House built in 2006, original HVAC. Only change is the full finished basement, er...lower level.

All vents down there are shut.

Carry Onward and UP!!


24 posted on 06/21/2012 5:43:39 PM PDT by GRRRRR (He'll NEVER be my President, FUBO! Treason is the Reason! Impeach the Kenyan)
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To: GRRRRR

I live in Texas hot weather - 100-108 degrees and I have a Trane. Keeps house cool.


25 posted on 06/21/2012 5:53:01 PM PDT by Marcella (God wouldn't vote for Romney so I won't, either.)
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To: Bryanw92

Hahaha!


26 posted on 06/21/2012 6:11:40 PM PDT by Copenhagen Smile
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To: GRRRRR

If you’re having problems with freezing you’re probably low on freon. But if you want to replace it I can highly recommend Trane.


27 posted on 06/21/2012 6:13:47 PM PDT by Lurker (Violence is rarely the answer. But when it is, it is the only answer.)
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To: GRRRRR

I live in Colorado 2,300 sq foot home down just north of Denver. My air unit went out and I replaced with a 4 ton with 5 ton exchanger. Bought a Lennox paid right at $4,000 through Costco. On hot days, maybe the house heats up to 75 if I have the air set to 72. Way better than my old unit.

For your size house I would say your needs are closer to 5 ton with a 6 ton exchanger. You might also want to look into the possibility of a dual zone with two 3.5 ton units but that would require you split your air handling.


28 posted on 06/21/2012 6:41:40 PM PDT by taxcontrol
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To: GRRRRR

bttt


29 posted on 06/21/2012 6:49:59 PM PDT by deweyfrank
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To: GRRRRR
Had a Bryant ( heat pump ) since the mid 90s but it died recently. Lasted years longer than average. Replaced with a Goodman. They make many of the parts for the major established old brand names and have the best warranty out there. Power bill went down by > 30%.
30 posted on 06/21/2012 6:56:55 PM PDT by Hillarys Gate Cult (Liberals make unrealistic demands on reality and reality doesn't oblige them.)
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To: Bryanw92
3500+ sq ft??? Are you the governor of Colorado?

As energy cost rise, so will the popularity of smaller homes in nice areas. In fact, it's already happening.

31 posted on 06/21/2012 6:57:16 PM PDT by dragnet2 (Diversion and evasion are tools of deceit)
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To: GRRRRR

I would go with a Lennox. Made in Marshalltown Iowa for 110 years. We have a Lennox heat pump that was installed in 1995. It runs 12 months a year here in Greenville TX and we have never even had it serviced.


32 posted on 06/21/2012 7:02:14 PM PDT by KMG365
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To: GRRRRR

Carrier is good. Also York has some good products.

Everything really needs to be sized right. The blower and a/c coil need to be the right size. If the blower is too strong air will be too warm, going over coil too fast. If too weak, the coil will ice up and no cooling.

Often having both units be from the same company makes things easier and if they are both replaced at the same time one part won’t be older and closer to replacement.


33 posted on 06/21/2012 7:19:09 PM PDT by Secret Agent Man (I can neither confirm or deny that; even if I could, I couldn't - it's classified.)
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To: GRRRRR
Good to hear from you too buddy the best to you and yours

Ya gotta remember cold air falls if you have ceiling fans reverse them to pull the cold air up off the floors and keep lower levels doors closed

get into where your A coils is that's the keys shut off your unit and let it thaw out take a squirt bottle of Windex and spray down the coils then use a strong shop vac with a brush attachment gingerlycleanall the dust out of the coils Windex will loosen it up so it will pull free from the coils ...

Next if you can unplug the squirrel cage and pull it out clean the dust off the blades real good dog and cat dander can really slow down the cage speed hence it will not cool your house efficiently i recommend doing this twice a year for the cage and change your filters once a month ....

Hope this helps it will keep your house allot cooler

remember don't smash down those fins on the A coils because smooth airflow through those coils is a must for a cold house in summer !

catcha on the flip

34 posted on 06/21/2012 8:14:41 PM PDT by ATOMIC_PUNK (Any man may make a mistake ; none but a fool will persist in it . { Latin proverb })
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To: GRRRRR

I read yours and others comments more closely and saw you had a two and a half ton a/c for a 3500 sq ft house. That is way, way undersized. I had a 2.5 ton prior in my house that was undersized for my house and mine is less than half the size of yours. I now have a 3.5 ton and it’s good. You’d need a 5 or 6 ton unit.


35 posted on 06/21/2012 9:42:38 PM PDT by Secret Agent Man (I can neither confirm or deny that; even if I could, I couldn't - it's classified.)
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To: ArmstedFragg

It also can freeze up if the blower is set too low, the cooling coil will freeze up as the air isn’t flowing by it fast enough.


36 posted on 06/21/2012 9:44:15 PM PDT by Secret Agent Man (I can neither confirm or deny that; even if I could, I couldn't - it's classified.)
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To: ATOMIC_PUNK

Happy Fried Day to AP and ALL!

Mercury hit 105 at the house today and the AC seems to be handling it just fine.

Cleaning the filter and stuff seems to have helped very much. AC output air temps ranged from 61-64 DegF all day, house stayed nice and cool.

Thanks for everyone’s input and have a FINE WEEKEND!

G


37 posted on 06/22/2012 4:26:07 PM PDT by GRRRRR (He'll NEVER be my President, FUBO! Treason is the Reason! Impeach the Kenyan)
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