By Pierrette Poulain. wiring. Published at Tuesday, March 26th, 2019 - 23:36:21 PM.
One time I had a buddy with 90 “defective” boilers; this was the guy who forgot to check the gas meters. The next time he called me he had 265 defective boilers. Of course, my first question was, “Do you have gas?” After I got called some nasty names, we proceeded with the questioning. I asked him if he had 110 V to terminal L1 and L2. This is always our starting point, making sure the electricity is turned on. I got the classic answer: “How do I know, I’m only a plumber.” I asked to speak to the electrician, who confirmed that he had power to L1 and L2. I asked what the voltage was; sometimes you have lower voltage and the system won’t work. He confirmed that he had 120 V. Next, I asked him if he had continuity through the control circuit. His answer was, “I’m a union electrician, I put power to the boiler and hook up thermostats; I don’t know about boiler wiring.” It was time for a field visit.
The room thermostat senses room temperature and opens and closes a circuit as necessary. It is wired in series with the safety controls to control the flow of gas. Figure 10 shows our steam boiler with the thermostat and pressure control installed. There are many types of thermostats on the market today. All low-voltage thermostats have heat anticipators built in. This device allows the thermostat to allow for the heat generated by the wires in the thermostat. On a forced-air furnace, the flue damper, spill switch, and rollout switch will be the same as the steam boiler. The operating control is a combination fan and limit switch.
Many system problems encountered by technicians are electrical in nature. Either the problem is an electrical defect, such as a defective switch or motor, or it can be traced electrically to the system problem itself, such as an open low-pressure switch as a result of a low system charge. In order to be proficient in troubleshooting a system problem, a technician must be able to efficiently troubleshoot the electrical components of a system. An excellent method of troubleshooting an electrical circuit is to use a procedure referred to by some technicians as “hopscotching.”
It is also a problem for manufacturers when misunderstood equipment is returned under warranty with no defect, as well as for homeowners when they don’t get the performance they expect. ”A lot of manufacturers still have a big metal box and one terminal strip with 17, 18, or even 19 wires,” Porter said. His dual-fuel control has three strips – one for the furnace, one for the outdoor unit, and one for the indoor thermostat – and the wires are clearly identified, he said.
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