That's right. you can only use timers that cycle no more than once an hour. In other words if it turns off at 5 it can't turn back on until atleast 6. This is to give the pump time to cool back off before it is turned back on. Think of it as a metal halide bulb if you turn it off it won't come right back on.
It voids the warranty and will destroy the pump. Unlike a standard impeller pump which can spin clockwise or counterclockwise and still work a prop pump only works if it spins the right way. Because of this their is a clutch system that stops a backward spin and it gets shredded by on and off use and eventually the motor overheats because no water is going through to cool the pump once the clutch stops engaging the prop.
The electronic pumps never use the brakes- in fact newer ones don't even have them. The electronics control the start up and monitor pump function and this type of motor construction allows a true soft start.
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