Trane said June 24 it is recalling more than 100,000 Trane XB300 and American Standard Silver SI air conditioning systems because the ground screws used in some units do not have the two threads required to provide sufficient grounding. This recall involves 37 models of Trane XB300 and American Standard brand Silver SI split system outdoor cooling units. The units are gray and have a black grated front. Check model numbers on the Trane website. Consumers should immediately turn off the cooling unit via the main breaker switch and check the model information. Consumers with recalled air conditioning systems should contact Trane or their installer or service dealer for instructions on scheduling a free inspection and repair. Trane toll-free at (888) 731-7561 from 6 a.m. to 11 p.m. CT Monday through Saturday, 7 a.m. to 11 p.m. CT Sunday, or online at www.trane.com/residential and click on "XB300 Product Recall."