Published at Tuesday, March 26th, 2019 - 19:18:31 PM. wiring. By Fawnia Leroy.
For example, let’s say the red probe of the voltmeter is initially connected before the CR contact to read line voltage, which is 115 V in this example. If the CR contact is electrically closed when the red probe is placed after the CR contact, the voltmeter should again read 115 volts. If the voltmeter reads 0 V, the CR contact is electrically open. This process can be repeated for all of the switches in the circuit. Again if line voltage is read before a switch and after the switch, the switch is electrically closed.
Bob and Tim are at a job where a technician from another company could not figure out the electrical, so he just put the panel back on the electrical compartment and left the job. It is a heat pump and the compressor wiring is all loose. They need to figure out how to wire it back and find out the problem. The homeowner said the original call to the other service company was because of ice build up on the outdoor coil. Bob and Tim talked to the homeowner and explained that because the weather was cold and damp, ice buildup was expected on any heat pump in this kind of weather, but they would check the unit and see what was going on. The heat pump compressor was not running and the home was being heated with the auxiliary heat, so the first order of business was to get the heat pump operating. They went outside and noticed the ice had melted from the outdoor unit due to an above freezing day. The compressor was not running; however, the fan was running. They looked at the compressor and discovered the wires to the compressor were all disconnected, and the ends were taped to make them safe. “
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