Published at Monday, March 25th, 2019 - 00:24:02 AM. wiring. By Stephanie Mathieu.
The room thermostat senses room temperature and opens and closes a circuit as necessary. It is wired in series with the safety controls to control the flow of gas. Figure 10 shows our steam boiler with the thermostat and pressure control installed. There are many types of thermostats on the market today. All low-voltage thermostats have heat anticipators built in. This device allows the thermostat to allow for the heat generated by the wires in the thermostat. On a forced-air furnace, the flue damper, spill switch, and rollout switch will be the same as the steam boiler. The operating control is a combination fan and limit switch.
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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