Published at Tuesday, March 26th, 2019 - 00:24:46 AM. wiring. By Leola Dupond.
The book also includes end of section review questions and exercises that can be torn out and handed into the instructor for grading. A separate instructor supplement containing the answers to the end of section exercises is also available.
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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