Sanden AC compressor units are some of the most reliable AC compressor on the
market and understanding the terminology of how to purchase the correct one is
vital. R-12 Sanden ac compressors use a specific numbering system and the R12
Sanden ac compressors use "SD" to signify the Sanden name. Then the units have a
3 digit code such as 709 for the R-12 Sanden AC compressors.
The Sanden compressors that are designated for the R-134 Freon use a slightly
different code then the R-12 Sanden compressors. The code is easy to determine
and follow a code like SD7H15HD can be broken down into its parts. The SD stands
for Sanden the maker of this air conditioning compressor. The 7 is the number of
cylinders in the Sanden compressor, H stands for the port location (H if it is
on the head and B if it is on the block) the 15 is the displacement in cubic
centimeters. The HD stands for heavy duty and there can also be SHD for sealed
heavy duty clutch.