Published at Monday, March 25th, 2019 - 11:01:22 AM. wiring. By Laverne Gerard.
Bob checked on each side of each heater and found three of the five heaters were drawing current; therefore they were heating. He said, “I can see why the system was not heating the building. It is very cold outside and will probably require all of the heaters to keep the building warm. Now, I need to find out why two of the elements are not working, and there are so many wires that I don’t really know where to start.” Bob looked at the diagram and said, “I can see that the thermostat starts the timed fan control and sequencer #1. Now what happens?”
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.
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