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Pool Timers
Most pool pump motors are wired to run at 230 volts (actually 208-270 depending on your local service) and 60 Hz, and this is important in your selection of timers.
The most popular timer is the Intermatic T100 series featuring a weatherproof metal box and easily configured timer.
Repair parts are readily available and most importantly, this device is long-lived and highly reliable. To adjust, simply pull firmly on the yellow wheel and rotate either way until the silver arrow points to the correct time. Metal 'on' and 'off' trippers mark the desired hours of operation.
Note the five wire connections on any 240 volt timer.
2 connections are marked as 'Line'.
Two 'hot' 115 volt lines coming from the breaker box are connected here.
Two 'Loads' connect the two wires running out to the pump. The green ground wire in this box is connected at 8 o'clock just off the timer wheel.
This 32 year old timer has ceased working, but the metal box is still sound and firmly planted and you'll understand exactly what that means when you try to get one of these boxes off a block wall.
In this case, replace only the guts of the timer.
Available through an electrical supply house or you may have to purchase the entire unit through a hardware or home supply and simply transfer the inner workings.
Note the top clip that is pressed up. Lift the plate slightly to clear two snap sites on each side of the plate.
Be absolutely sure the electric breaker feeding this box is turned 'off' before you touch anything behind the plastic insulator cover (shown above, pushed aside to the left in the photo) .
Why you should consider adding another set of trippers or making one timer slave to another are just two more of the hundreds of problems you will find fully explained in the 680 page Pool School PRO CD.
