By Georgitte Lecomte. wiring. Published at Monday, March 25th, 2019 - 13:22:24 PM.
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.
The HVACR Wiring Troubleshooting Trainer Program is a module designed to help teach HVACR students how to troubleshoot heating and cooling control systems. It contains an interactive computer program, instructor’s manual, student workbook, student assessment, PowerPoint presentations, and the instructions on how to build instructor and/or student hands-on trainers. This module training program covers five areas of study: symbols, sequence of operation, series and parallel circuits, relays (coils and contacts), and troubleshooting. The interactive computer program uses a basic heating and cooling control ladder wiring diagram. The module can be taught in a four-hour block time frame or spread out over the instructor’s whole lesson plan.
The importance of understanding and using wiring diagrams to troubleshoot refrigeration systems cannot be overemphasized. Most system problems can be divided into two broad categories: electrical or mechanical. However, the majority of system problems are electrical. Mastering the use of wiring diagrams enables a technician to better troubleshoot the system electrically, which will facilitate troubleshooting the entire system with more accuracy and precision.
Being able to efficiently interpret ladder (line) diagrams is an important part of electrically troubleshooting many HVACR systems. These diagrams are drawn in such a format that it is quite easy to understand the electrical configuration of the system. The ease in reading these diagrams is accomplished by drawing each load and any switches that control that load on a separate horizontal line. For example, if a load is not energized when it should, a technician should be able to easily identify which switch or switches control that load and then start to troubleshoot the cause. Ladder diagrams are also drawn with other helpful identifiers to aid a technician in electrically troubleshooting a system.
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