Published at Monday, March 25th, 2019 - 14:02:09 PM. wiring. By Leona Coste.
Anyone whose job involves servicing electric motors has encountered the problem of a missing nameplate. Other articles in the Motor Doctor series have covered ways of determining the specifications of a motor lacking the nameplate, but what if you are trying to figure out how to wire that motor? For some kinds of motors, principally motors with terminal-based connections, basic wiring is self evident. The terminal board itself usually has markings that indicate where line one and line two are to be connected. But what if you need to reverse that motor, use a different (but available) voltage setting, or have a motor that has nothing more than a bunch of color-coded or numbered leads coming out of it?
Last week we discussed the basics of gas boiler wiring and wiring in general. Now let’s add safety and limit controls for each type of system. I’m going to start with a steam boiler, since it is the least complex and the easiest to understand. A steam boiler uses a pressure control that opens on pressure rise and a low water cutoff (LWCO) that opens when the water drops below a predetermined level. First let’s talk about LWCOs a little. There are two types of LWCOs, float types and probe types. The float type is installed in a water column (on residential boilers, usually the gauge glass); a float opens and closes a switch as the water level changes. The probe type installs into the boiler water and uses the water in the boiler to close the circuit.
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