Two wire/two insulated wire pumps have the starter switch built into the pump. Just a plain pressure switch to control operation. The more reliable three wire pump moves the starter switch up into a relay box mounted near the pressure switch. The three wire pump also allows varible speed control via Frankilin Mono Drive or Mono Drive XT. Instead of the pump pounding on and off while water is being used. The pump speed is varied during water demand. When demand slows to a dribble or stops. The pump stops and the system goes to standby similar to the old systems with a bladder tank. If the old pump has quit. You are on borrowed time just replacing a coupling etc. If you have to yank everything out. It's time to replace the motor,pump, wiring, hoses and pitless adapter. Or you will get to look at all these parts again real soon.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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