. The model is determined by a model number which is usually located on the unit data plate or rating plate. Database contains 1 Lennox GCS16-240 Manuals (available for free online viewing or downloading in PDF) User's information manual. HS26 060 1P GCS16 090 350 2Y Lennox June 20th, 2018 - tonnage to the Btuh capacities found in model numbers Old Nomenclature CHA Single package air conditioner condensing amp evap coil and blower in same unit. GCS16024, 030, 036, 048, 060 GCS20024, 030, 036, 048, 060 GCS20R024, 030, 036, 042, 048, 060 504,558M 82002 Supersedes 22002 See unit nameplate for manufacturer and address. . Email Print. This designation is the last letter in the unit model number.