This for me was a difficult job. Rarely did I condemn a furnace on pressure switch only. Carrier furnaces had some that the secondary would fail due to the coating coming loose. Can’t see or will it pass co. Switches are measured in inches so sucking or blowing will not give a good example. Cracked heat exchanger can be visible and yet not pass co. Certain furnaces were prone to fail and the only thing showing is a failed switch but you better have checked all line and were using a manometer with the correct capacity. Age becomes a problem also. I have also been to units that visibly had cracked and the owners would not change. Laws now dictate what can be left on but it sounds like the tech was not real thorough. Second opinions are always best unless you trust the company doing the work. References are good.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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