Question about Carrier 38CKC036 Air Conditioner

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The plenum that houses my coils sweated repeatedly and the coils seemed to freeze. An agent told me that my unit was leaking at the fittings to the outside unit as well as the coils . The unit he used to detect the leak beeped almost all the time including when he wasn't sniffing at the sites. The evaporative coils and the AC unit are 6 years old . How likely is it that the coils are really leaking?

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Hello JBESTER Defrost the unit completely and see if the pressures are low.If more than half the charge/freon(3+)lbs has to be added you have a leak.Make sure the air filters are new as poor air flow can cause ice also.The sniffer I use beeps all the time BUT when near a leak goes crazy!The coil can leak after 6 yrs.You will always will need a recharge untill leak is resloved.

Posted on Aug 25, 2010

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1 Answer

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check that the drain plug is tight in the bottom
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The "A" coil will generally be larger than the outside coil as far as the tonnage goes. When a unit has an expansion valve the charge should be based on subcooling instead of superheat. The reason for this is that the expansion valve acts to maintain a constant level of superheat. The best solution may be to have all the refrigerant recovered, then weighed back into the system. The length of lineset should also be checked. Units come precharged with enough for 25' of lineset and the charge will need to be adjusted for more or less that 25'.

Dec 11, 2010 | Heating & Cooling

1 Answer

We had 2 new units installed 2 yrs ago and now it's sweating


1st of all the pan under your unit should not have water in it unless the primary drain from the evaporator coil is plugged.

2nd the secondrary drain pan underneath the unit should go to some kind of drain, along with the drain
from the evaporator coil. They should not be hooked
together until they reach the proper drain.

Check to see if they are hooked up together, if one is
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It could very well be that they did not insulate the plenum, if it is sweating on the outside, insulate it.

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1 Answer

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Seems like your blower motor is burning up. Its the motor that blows cool air across the refrigeration coil. If it is a whole house ac unit, probably your main blower motor for the furnace. If you are getting sweat, that means the compressor is compressing the refrigerant, and you should not smell anything from the outdoor unit, only from the furnace. Hope this helps.

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1 Answer

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Usually when the indoor coil freezes up you either have dirty filters or coil but if you had this unit replaced last year your coil and filters are probably OK so you probably have a leak in the unit and are low on refrigerant.

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1 Answer

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1) locate the A-Coil (A-frame) inside the furnace. It is usually located in the furnace supply plenum located on the "down" side of the furnace plenum. If it is very dirty, there will be poor air flow generally in the house. This can cause the A/C to "freeze up" as the refrigerant is not getting enough heat to convert the refrigerant to a gaseous state.

2) The unit may be low on freon (or whatever refrigerant you are using). Contact a serviceman to check the unit.

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