Hey, BAC systems are usually microprocessor controlled and normally can be set from the controller with the different times and days the bell would be used. My school ditched their old analogue Simplex controller and retrofitted it with an Entek TC2100 digital time clock controller. I would contact Simplex and ask them for the manual for the control system. Or do what I did, PLAY WITH IT!
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(939)645-6515email: doctorclock123@gmail.com We fix Simplex Time since 1988 ALBERT GARCIA
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