Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

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Need tonnage of old carrier Model #38GS030310

Installed in my house in 1974, outside unit is egg shaped.

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Posted on Jan 02, 2017

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SOURCE: Carrier air handler tonnage?

That is a fairly large difference. It is usually ok to have the inside evap. coil and blower up to 1 ton larger than the outside condenser. That will make the unit slightly more efficient as well as less likely to freeze up on low airflow situations. It is not recommended to install a new condenser on an old evap coil. There has been a lot of changes to the design of the coils in the last little while. For example a 10 year old 2 ton coil may only have 3 cubic feet of volume but a new 2 ton coil may have 4 cubit feet of volume.

There are many factors that may have infulenced the decision on what size condenser to install. Many of which can only be done by visiting the home and doing alot of work, checking the duct sizing bioth supply and return, inspecting the insulation and windows of the home etc. etc. Most of the time that never gets done. You can blame the contractor for not doing a complete check, but at the same time you can blame the customer because many contractors that are that good loose the job to a cheaper bid that did not no any of the research. It is a catch 22 for everyone involved.

There is ALOT more to sizing equipment that many people think, sadly that also includes many HVAC contractors. Way too many people use "rule of thumbs" or flat out "guess".

Sorry for the rant but your queston can only be answered by a good well educated HVAC contractor visiting your home. That type of a contractor is getting hard to find these days in such a price competetive world.

Posted on Oct 14, 2008

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SOURCE: Tonnage of my Carrier AC Unit

3 1/2 ton unit the 042 tells me.

Posted on Dec 11, 2008

jgwhomeequip
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SOURCE: My Carrier AC fan will not turn, only blows out warm air.

Breaker has popped either at breaker box or at the safety shut off switch. Fuses are blown or the sending unit has popped.

Posted on Apr 30, 2009

james3751
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SOURCE: How to find tonnage for my Carrier AC

3.5 ton unit

Posted on Jun 14, 2009

  • 4736 Answers

SOURCE: what tonnage is my new

The AC unit you inquired about is 3.5 ton unit. With a 10 seer rating.

Hope this information helps.

Posted on Mar 01, 2011

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1 Answer

What tonnage are unit Carrier A/C Model FB4ANF30000ACAA ?


Tonnage is not used much as a rating anymore. That model is a 3 ton. The rating used now is either BTU or SEER.

Jan 10, 2016 | Carrier Heating & Cooling

1 Answer

I have a Carrier Weathermaker model #38tdb060300 A/C system. How many tons is that? It is 11 yrs old, capacitor exploded and compressor is blown. Needing to replace.


Looks like a 5 ton unit. However, you might be better off finding a R-22 condensing unit to replace the entire outside unit. Reason being, if you just replace the compressor, you get a one year warranty. If you replace the whole outside unit, you get a 5 year warranty. You can replace the outside unit with any manufacturer, as long as it is the same tonnage and type (heat pump/air conditioner/single stage/ 2 stage ...).

Oct 13, 2014 | Heating & Cooling

1 Answer

Pa12NA048-d. How many tons is this unit? It's 7 years old and went out. Needs replacing.


Hi, the tonnage is a 4 ton unit. It says in the model number, the 048. There is 12,000 btu's per ton of cooling. So, on your unit 4x12=48= a 4 ton unit.
Good Luck,
Shastalaker7
A/C Contractor

Aug 27, 2011 | Carrier Heating & Cooling

1 Answer

Hi there I have a model number for my carrier a/c unit. I need to find out the tonnage. 38ykc042300 Please any help I will be very greatful.


This is a 3 and 1/2 ton unit.
The 042 in the model number is the tonnage of your carrier unit.
AC tonnage is based on 12,000 btu per ton.
12,000.....1 ton
18,000.....1 and 1/2 ton
24,000.....2 ton
30,000.....2 and 1/2 ton
36,000.....3 ton
42,000.....3 and 1/2 ton
48,000.....4 ton
60,000.....5 ton.
There is no 4 and 1/2 ton unit.

Apr 09, 2011 | Heating & Cooling

1 Answer

I have found this model number on the side of the AC unit outside my house and I need to know the tonnage rating. I know it is only 10 seer but can't find this info on the tag.


Did you include the make and model information?
I only see your question worded this way:

I have found this model number on the side of the AC unit outside my house and I need to know the tonnage rating. I know it is only 10 seer but can\'t find this info on the tag.

Tell us more-- or go on line and do a search for the make and model-- Can you do that?

Mack B.

Dec 28, 2010 | Heating & Cooling

1 Answer

Can I mix brands/tons when installing AC unit to existing coils?


First off - the 'rule of thumb' is 600' per ton of Air Conditioning. In other words your old unit is a 2 ton unit. So - 2 tons x 600' = 1200'. As you can see if you install the 2.5 ton unit - you will be installing a AC that 'could' cool a 1500 sq ft house (2.5 x 600' =1500 sq ft.). Slightly more than what you need; and the 3.5 ton unit is 'way to big,' (3.5 x 600' = 2100 sq ft.).

Note: fyi - many in the AC business will sometimes refer to tonnage in btu's, i.e. 1 ton = 12000 btu - hence a '2 ton unit' can also be referred to as a 24000 btu unit and vice versa.

So... from the above - you can easily see that "2 tons" of Air conditioning is what is required to cool the 'average' home of 1100 sq ft. "roughly speaking."

Note: it is always best to have a professional 'size' your cooling/heating needs.

One of your questions was could you 'mix tonnage?'

The answer is 'usually you don't mix the tonnage of your outside/inside units.' However, professionals sometimes do (mix the tonnage) in certain situations, and installing a 2.5 ton outside unit with an existing 2 ton inside unit is often done, however, there are some 'tech issues' here and - I would "again" recommend that you call a Service Tech to help you with the sizing/mixing of your cooling/heating needs.

hope this has helped

Jun 20, 2010 | Carrier 38CKC036 Air Conditioner

2 Answers

Tonnage of unit


Listed at Carrier at 2,330 Kilos so math says 2,330 X 2.2 = 5,126 lbs or about 2.5 tons though they listed it as a 3.5 ton max back when they sold this model.

May 12, 2009 | Carrier 38CKC042 Air Conditioner

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