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I have a 2.5 ton carrier a/c on a roof with a 15 ft drop and a 200ft lineset is 7/8 and 3/8 going to work for this app

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Normally the maximum lineset that can be used with a residential air conditioning unit is 50 feet. If the lineset is longer than this, it must be sized accordingly and without the model and serial number I am unable to do this.

Posted on Nov 13, 2009

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Posted on Jan 02, 2017

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2 Answers

1904 sq feet how do I convert this to linear feet for roofing


I have done tons of roofing and we always use square feet .length X width= sq ft .like 50 ft long by16 =800 then double to get both sides of roof is 1600 sq ft

Feb 12, 2015 | Cars & Trucks

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How many tons needed for 20,000 sq. ft.


There are so many variables that you should seek professional advice. The number of windows, insulation value and a number of other variables will all play into what size of cooler you are going to need.

Jan 26, 2015 | Carrier Heating & Cooling

2 Answers

With a typical line set, how much R-22 should a ckl30-1 2.5 ton a/c need?


the refrigeranterant charge is stamped on the unit data plate in ounces of freon. take this number and multiply it by 16 and get the pounds and the decimal point will need to be converted back to ounces. example 138 ounces equals 8.625 lbs of freon which is about 8 lbs and 8 0r 9 ounces. this is for a 15 foot lineset. measure your lineset and substract 15 , then take this number and add .6 per foot. .6 ounces of freon per foot of refrigerant line over 15 feet. you will have to use a quality digital scale to weigh in this total charge

May 23, 2014 | Goodman CKL30AR30 Air Conditioner

1 Answer

How 2 add r22


The best way is weigh in a charge. of course the type of unit will come into play as split systems have enough refrigerant factory for up to 15 ft lineset or so, depending on units make etc. If a charge exists already and requires adjusting due to lineset length, or repairs etc, youcan simulate a 95 degree day ambient outdoors by restricting the air flow a bit to artificaially raise the head pressure as do low ambient controls, thus bringing the head to around 270lbs in a r 22 system or ambient plus 30 degrees , converted to prressure, so a 95 deg day plus 30=125 deg converted to pressure is 269 lbs, the indoor air temp being clse to 80 degreees helps, the indoor coil will be 40 degrees cooler than the indoor ambient if all is normal and design conditions are met by God or you. If the indoors 75, go to a 35 d
eg coil temp this is ball park, as the subcooling (15 deg)and superheat (10 at the evap coil, 20 at compressor) will need to be monitered along with amp draw and Delta T or temp differntials suply vs return.2_25_2012_2_55_05_am.png

Feb 24, 2012 | Heating & Cooling

2 Answers

Ac won't go down past 78 F while operating the presures are 15/ 150 psi. I think it needs charge. But how much charge what pressure does the low side need to be at?


The temperature outside and pressure chart are needed to accurately determine the proper charge. (temperature pressure charts to calculate heat gain) However the low side of the unit should read around 70 and the high around 210. This is a really broad generalization and I do not recommend you charge your unit just on this info. It will get you close if you are using R-22 and the unit is properly cleaned. A dirty evaporator coil will cause a severe low pressure reading on the low pressure side.

Jun 28, 2010 | Carrier 38CKC036 Air Conditioner

1 Answer

In a residential system that presently has a 3/8 -5/8'' lineset 30 ft long on a R22 system, can a 2.5 ton 410A system work on that size lineset?


Look at the manufacturer's instructions and it will tell you how much line set the factory charge is good for. Don't plan on using the same line set that was hooked to the R22 unit as R22 and R410a use different types of oil that are not compatible. Hope this helps.

May 04, 2010 | Heating & Cooling

1 Answer

Have a model 38TRA018330 condenser keep losing compressors. Run is 223ft with 1/2 suction line and 1/2 liquid line. Can you help? I know the compressor is only rated at 200ft and i can shorten the run will...


Too long of a lineset for sure. You can put a suction line trap in and add 1.5 ounces more oil to new compressor. This should keep compressor better lubricated.

Mar 29, 2010 | Carrier Heating & Cooling

1 Answer

Air conditioner replacement--new size required?


567C024RCU In this model number is the # 24. That stands for 24,000 btu's. This is a two (2) ton unit. Has this two ton unit cooled ok in the past? if so replace with the same size. But make sure yo change the indoor coil to match the size "and" efficiancy of the ew unit.

Apr 14, 2009 | Carrier 38CKC042 Air Conditioner

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