Published at Tuesday, March 26th, 2019 - 08:12:57 AM. wiring. By Karla Regnier.
Another problem I ran into with probe-type LWCOs is foaming. Remember I said that probe-type LWCOs use the water in the boiler to close a circuit? Well, if you didn’t clean the boiler water according to the manufacturer’s instructions, instead of water, you can have foam in the boiler. Oil and dirt are in the water and as it boils, it sends the water rushing into the steam pipes; what’s left in the boiler foams up and the boiler thinks it has water and keeps running. This usually leads to a cracked boiler. The moral to this story: No matter what kind of LWCO you use, clean the boiler or get the homeowner to clean it. Personally I like float types, but either LWCO works if the boiler water is clean.
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.
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