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 - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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