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Become A Top Selling Salesman

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  1. Mentality Of A Top Salesman

  2. Waking Up In The Morning
  3. Driving To Work
  4. Being On Time
  5. Reading The Job History
  6. Pre-Screen Call Using Zillow
  7. Walking Up To The Home
  8. Mentality Quiz
    1 Quiz
  9. Sales & Estimate Process
    Why To Buy Today
  10. Setting The Stage
  11. Building Urgency Early
  12. Attic Inspection
  13. Measurements
  14. How To Use Presentation Book
  15. Going Over Options
  16. Step Financing Explained
  17. How To Reset The One Legger
  18. Selling Your Company
  19. How To Peak A Customers Interest
  20. Install Incentive Close
  21. Asking For Their Business
  22. Post Close
  23. Explaining A Single Stage Furnace
  24. Explaining A Single Stage AC System
  25. Explaining A Variable 2 Stage AC System
  26. Explaining A Variable Stage Furnace
  27. Sales & Estimate Quiz
    1 Quiz
  28. IAQ & Ducting
    Drawing Their Duct System
  29. Insulation Level Check
  30. Attic Inspection
  31. Duct Inspection
  32. Dampers Explained
  33. Greyflex Ducting
  34. Asbestos Ducting
  35. Mylar Ducting
  36. Explaining A UV Light
  37. IAQ & Duct Quiz
    1 Quiz
  38. How To Build Urgency
    4 Reasons To Replace Your Ducts
  39. Turning Over A System To A Salesman
  40. Turning Over A System To Yourself
  41. Shoulder Season
  42. Next Day Installation
  43. Creating Urgency With A Poor Condition Heat Exchanger
  44. Building Urgency Quiz
    1 Quiz
  45. MISC
    Inspecting Tubular Heat Exchanger
  46. Explaining Tubular Heat Exchanger
  47. Inspecting Serpentine Heat Exchanger
  48. Explaining Serpentine Heat Exchanger
  49. Inspecting Lennox Duracurve Heat Exchanger
  50. Explaining Clamshell Heat Exchanger
  51. Heating Sequence Of Operation
  52. Drawing A System
  53. Rat Check
  54. Ladder Drop Attic Access
Video 48 of 54
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Explaining Serpentine Heat Exchanger

Alright, everyone, in this section, we’ll dive into serpentine heat exchangers and how to identify and inspect them. The name “serpentine” comes from their snake-like design, which you’ll notice when viewing them from the side. This unique design is not just for show; it plays a crucial role in how the heater operates. When the direct ignition gas valve opens, it sends flames into the front cells, directly heating this serpentine chamber. The design’s primary purpose is to slow down the heat as it moves through the exchanger, going from larger areas at the bottom to smaller ones at the top, enhancing heat transfer efficiency.

However, this design is also prone to certain failure points due to the very process of compressing a large, hot area into a tighter space, thereby concentrating the heat. The most common areas for failure include the bends where the metal twists slightly. It’s at these points, along the edges and where the metal is dimpled, that we often find cracks or signs of stress. Additionally, failures can occur at the rivets, where two pieces of metal are joined and secured together. Over time, the continuous expansion and contraction from heat exposure can lead to overheating, stressing these joints and sometimes causing the rivets to pop out.

An interesting field trick to diagnose issues with these exchangers involves tapping the side of the exchanger. A distinctive ringing sound can indicate that the rings have become loose, and I remember wearing them like a necklace as a memento from jobs where I found them.

For inspecting a serpentine heater, the most accessible approaches are either through the high limit switch, using a mirror or camera, or by physically removing the exchanger for a comprehensive inspection. There are three primary areas to focus on for potential failure: any spot with a tight bend, which can become exceptionally hot and prone to stress; areas around the dimples, which are also susceptible to cracking; and any rivets, which may fail due to the metal’s repeated expansion and contraction.

One of the advantages of serpentine heat exchangers is their modular design, allowing for individual cell replacement if necessary. However, it’s crucial to consider that a failure in one cell often indicates broader issues with the heater, such as an undersized return or a clogged coil, which could lead to further failures. Therefore, while individual cell replacement is an option, I strongly advise discussing the possibility of replacing the entire heater with your customer, ensuring a comprehensive and professional solution.

I hope this overview enhances your understanding of serpentine heat exchangers. Given their prevalence in the market, becoming proficient in identifying and addressing their common issues will be invaluable in your work.


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