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We have a 16 yr old basic 4 ton Carrier unit. Coolant was a little low when started it up this spring. Had it recharged but now believe there is a slow leak in the coil. Is this usually repairable? Could the compressor get damaged if it runs to low on coolant? And can the coolant leak fumes be harmful when inside the house? Thanks

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  • Kelvin Hawkins Apr 25, 2010

    Thanks for the tip. Also, can I use my auto ac guages to check pressures on home ac unit, or are the hookup fittings different? And what are the typical ranges I should see for the high and low side? Thanks

  • Kelvin Hawkins Apr 25, 2010

    Yes, this was helpful. Thanks

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If it has a small leak, it might be a pain to find but it is possible and yes it can damage the compressor. Also it can be harmful as it will displace oxygen. It's not combustible though.

Posted on Apr 25, 2010

  • Paul Apr 25, 2010

    As for the high side and low side, Im not sure exactly as I am not familiar with this model exactly. I am more familiar with modern refrigerators.

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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
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Aug 27, 2011 | Carrier Heating & Cooling

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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.

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1 Answer

I have a 5 year old Carrier 2 Ton hvac system and heard that the CK5B N Coil has been know to have issues. I had the system looked at a year ago and the coolant was low. They added coolant but never...


We have noticed some of these same problems in TEXAS.. the coils have a potential to leak earlier than their expected lifetime but the problem is not severe enough for government to force a recall unfortunately... Maybe in 10 years... grrr right ? .. That price is good for materials and labor to change the part under warranty and most system checks for service agreements do not include looking for a leak.. usually just cover a pound or two of refrigerant.. I hope this helps.. the new coils are awesome..

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My adp coil already failed in my only 2.5 yr. Old Carrier ac unit. I am now looking at an estimated $1500.00 repair. Coil is under warranty so the above cost reflects labor only. Adp serial #7107A07780....


Sorry, I don't have any solution but I'm in the process of replacing my 2 AC systems (4 tons by York). My RUUD dealer has provided RUUD ac and gas furnace with ADP coil and not using RUUD coil. Should I insist on using RUUD coil rather than ADP coil?
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What is the blower model for the Carrier Unit FC4BNF042. My unit sounds like something is loose or flapping around the blower and up into the duct work. I believe it is the blower. I took the blower unit...


Hi, when you have a little play from side to side just shows very little bearing wear on the blower motor. In and Out play is normal. Spin the wheel to see if it is true. If the blower wheel has a lot of dirt build up on the blades it will cause it to be out of balance.If it is clean, but warped, take it to a motor repair shop along with the model and serial numbers. Call you're local wholesale a/c parts house with all of your info and they will look this up for you.The numbers that you have listed shows you have a 042 which is a 31/2 ton and 048 which is a 4 ton unit. More then likely, the wheel is out of balance and should be replaced, and they can look up the info you are requesting. Good Luck,
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1 Answer

New Goodman condenser unit run almost contiously using too much e


I'm not sure of the kilowatts. The 10 min on and 5 off is telling me there is to much heat by the thermostat or you house needs more insulation. The new compressor is designed for more efficient run time. The other thing is the unit to big for your house? It should run 10 -15 min when low humidity is in the house. Otherwise longer if its pretty warm inside.

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Is an old unit worth fixing?


I recommend going with a new one. Both the coleman and the carrier are excellent and a whole lot more efficient that the 16 year old dometic.

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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.

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