I’m new to the SS Car Wash. My timers do not have a buzzer on them. How do I add one? The timer is inside the equipment room and the option selector is in the coin box at the wash bay.
You need a timer with a "last minute" alert. There are GinSan timers that have it built in, so you can either directly replace what you have as long as you have an unused wire to connect the horn in the bay, or you can move the timer to the bay. I'd recommend Dixmor display timers in the bay, which will also give you a display of time remaining and future upgradability to adding a credit card system with count-up.
If you don't wish to replace coin box face plates for display timers...
IDX makes a "L" version of their AT411E timer.
You'll need an available wire from the timer to each coin box and 24 volt AC horns.
We programmed our PLC dog wash with a grace period that counts down on the large touchscreen display. I think a "grace period" has proven to be worthwhile IMHO. Especially in combination with some kind of display showing the grace time!