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1880 12/31/2005 9:38:59 AM 12/31/2005 TechTalk Staff TechTalk@newellcoach.com air pocket doors The quick answer to when the 110-volt compressor was connected to an inverted circuit is sometime between 1994 and now, but we'll check our records and see if we can identify the date. The reason some air powered items do not operate when the 12-volt compressor is the only source of air is that this compressor is of limited capacity and is plumbed to pressurize only a selected list of components. This list has always included the toilet, but apparently the air doors were not included in 1995. Since then, the air doors have been added to the items powered by the 12-volt compressor. Another key system that operates from the 12-volt compressor is the air seals on slide-out coaches. The whole idea is to provide a reasonable level of functionality even when neither the engine is running nor a primary source of 110-volt power is available.