By Natuche Adam. wiring. Published at Tuesday, March 26th, 2019 - 08:18:43 AM.
In the example shown, line 5 has the numbers 5 and 11 printed to the right of the line. This means that the load (HR) controls a set of contacts in lines 5 and 11. The contact in line 5 is normally open and the contact in line 11 is normally closed. Many times there are also small numbers printed next to each of the electrical components on the diagram. In our example, we have colored these numbers blue. These smaller numbers represent the manufacturer’s numbers stamped on the actual electrical component. For example, the compressor overload OL2 has the numbers 3 and 4 printed next to it. This means that the wiring shown on the diagram will be physically connected to terminals 3 and 4 on the actual overload. This allows a technician to more easily locate an exact point in the wiring of the system. Lastly, some diagrams will also have a circled number shown next to a line on the diagram. These circled numbers are used to identify the actual wires used on the system.
In power engineering, a one-line diagram or single-line diagram (SLD) is a simplified notation for representing a three-phase power system. The one-line diagram has its largest application in power flow studies. Electrical elements such as circuit breakers, transformers, capacitors, bus bars, and conductors are shown by standardized schematic symbols.[
One other way to wire multiple zones is with the use of zone valves. A zone valve is a motorized solenoid valve with an end switch. The thermostat for each zone is wired through a 24-V transformer to the zone valve. A mechanical end switch is wired to the thermostat terminals of the boiler operating controls. When choosing a transformer for zone valves, make sure that the VA (volt amps) rating of the transformer is sufficient to run the zone valves attached to it.
The first things we need to do are check the compressor electrically and make sure it is safe to start; after making sure the compressor is safe to start, we need to reconnect it and see if it will start — the start assist (PTC) device may be defective; and when and if the compressor starts, we need to give the system a thorough check up to see why the technician was even doing what he was doing to cause him to disconnect the compressor,” Bob replied. “How can we make sure the compressor is safe to start?” Tim asked. “We want to make sure that it is safe to apply power to the terminals, Bob said. ”Use the Ohmmeter set on RX10K (10,000 Ohms). Second, fasten one lead to a good ground, scrape any scale or paint off the suction line, for example, and firmly hold the lead to the bare spot. Then, touch the other lead to one of the compressor terminals and record any reading. There should not be a reading. If there is a reading, the compressor has a ground circuit in the compressor. A circuit from the motor windings to ground. ”To illustrate how your meter works, you should be able to read a slight reading through your body if you hold one lead in each hand,” Bob continued. ”
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