Hi There I would like to know the history of the ANSI fire service that when phase one fire key 1 sw is on and phase 2 is switched off on other than alternate or designated fire floor you will come back to fire main floor on phase 1, but if phase one is off on main floor and you are one phase 2 you have to go back to main floor to turn phase 2 off.

*WHAT YEAR DID THEY MAKE THIS CHANGE. *WHY DO THEY HAVE THAT OPERATION. *WHAT DO YOU DO IF YOU HAVE EXISTING SOLID STATE US 1220 CONTROL OR OTHER TO MAKE IT COMPLY WITH LATEST A17.3 * DO YOU MAKE CONTROL CHANGE OR PUT STICKER ON DISCONECT OF VINTAGE OF EARLIER FIRE SERVICE OPERATION.

Thanks Jim

-- jim (elevator555@hotmail.com), August 21, 2003