A/C Learning Center – Part II

A/C Learning Center – Part II

The red boxed area is the Serial Number for this type of unit.  The “L” indicates the month of the manufacture.  “L” being the 12th  letter of the alphabet and the ‘01” being the last 2 numbers of the year, thus meaning this is a December 2001 manufacture date. This is the area where the data or information from above was obtained.  The exterior portion of the AC system called the compressor.

 Congratulations on learning how to determine the age of an Air Conditioning Compressor.  The air handler’s age is determined much the same way.  The air handler is located within the interior of the residence most of the time it is in a closet, garage or attic area.  This applies to the MAJORITY of AC units in SW Florida.  Other types are present, but this will allow you to determine the age of many of the AC systems.

 How to determine the size (called tonnage) of an Air Conditioning system:

First of all the size of an AC unit is called a ton or tonnage.  A recap of tonnage is Tonnage  The unit of measure used in air conditioning to describe the cooling capacity of a system. One ton of cooling is based on the amount of heat needed to melt one ton (2000 lbs.) of ice in a 24 hour period. One ton of cooling is equal to 12,000 Btu/hr.

The number to remember is 12,000 BTU’s or more simply 12.  If 12,000 BTU’s is equal to 1 (one) ton of AC then 18,000 is equal to 1.5 tons and 24,000 is equal to 2 tons and so on.

Look at the model number (Located on the data plate stamped on the actual side of the compressor) on the compressor and there should be a number divisible by 12.  It should start at 18 and not be more than 60 for residential AC units.  18 to equal 1.5 tons and 60 to equal 5 tons of cooling.

Look at the model number below and you determine the AC compressor size.

The 36 in the model number in the first picture above it means that the AC compressor is equal to 3 tons of cooling.

Once again, size is very important and detrimental to the proper operational status of an Air Conditioning System.

Comprehensive Building Consultants
Phone: 239-481-3977
E-mail: russell@bestinspector.com

Posted on October 15, 2013, in Inspections and tagged , , , , , , , , , . Bookmark the permalink. Leave a comment.

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