I have purchase carrier ac 1.5 ton in may 2011, bt from last 10 days i m continously having a problem of water leakage from inddo unit. pls help me

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.

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

Hope this information helps.

the 'rule of thumb' is 1 ton of AC for every 600 sq feet of a well insulated space (400 sq ft if not well insulated)- for example if the space to be cooled is 1200 sq ft - and is well insulated - you would require a 2 HP unit. 1200 divided by 600 = 2

if the space was not well insulated - you would require a 3 HP unit. 1200 divided by 400 = 3

note; 1 ton of air conditioning - is sometimes referred to as 1 HP or 12000 Btu. Whether you call it 1 HP or 1 Ton or 12000 Btu - they all three mean exactly the same thing.

take this example - 2 tons of air conditioning can also be referred to as 2 HP or 24000 Btu.

fyi - it doesn't matter what 'brand' - they all work off the same principle.

hope this helps

the water comes from the coil, start there make sure there is no obstruction coming out to your condensate line and make sure its properly pitched.

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.

Draim pans do get dirty and partialy block drain pan. If possible take a shop vac and gently **** out the drain line. This will pull the restriction out of the line and help clean drain pan. Rusty

It's a 2 1/2 ton unit

3 1/2 ton unit the 042 tells me.

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.

Yes you can sell this unit. You would have better luck posting on ebay or craigslist.