Published at Monday, March 25th, 2019 - 13:24:09 PM. wiring. By Georgitte Lecomte.
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.
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.
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