Published at Monday, March 25th, 2019 - 10:11:42 AM. wiring. By Voletta Roche.
For wiring a single-phase motor, the most important objective is to distinguish the starting circuit from the main winding. These two circuits are isolated from one another electrically if the lead wires are separated and not in contact with each other. Initially, the ohmmeter can be used to determine which wire belongs to which circuit as well as checking continuity between leads. You should be able to isolate into two groups any leads which have continuity with one another. The starting circuit is likely to isolate to two leads, the running circuit may have two or more leads that show continuity. If the running circuit has more than two leads, you will need to determine how those leads are to be used for voltage or speed changes.
Bob checked on each side of each heater and found three of the five heaters were drawing current; therefore they were heating. He said, “I can see why the system was not heating the building. It is very cold outside and will probably require all of the heaters to keep the building warm. Now, I need to find out why two of the elements are not working, and there are so many wires that I don’t really know where to start.” Bob looked at the diagram and said, “I can see that the thermostat starts the timed fan control and sequencer #1. Now what happens?”
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