Published at Tuesday, March 26th, 2019 - 00:40:26 AM. wiring. By Leola Dupond.
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.
Wiring diagrams can aid a technician in many ways. They allow a technician to systematically troubleshoot a problem. By analyzing the system’s wiring diagram, a technician can see where the common junction is located that could affect the components that aren’t working. The technician can then start at that point without having to check the entire system. For example, a technician arrives on the job and finds that the compressor is the only component of the system that is not running. By studying the wiring diagram, it can be quickly determined from where power is applied to the compressor and which components are wired in series with it. When possible, it is a good practice for a technician to keep on hand wiring diagrams of the equipment most frequently serviced
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