Back to Training

Become A Top Selling Salesman

0% Complete
0/0 Steps
  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 50 of 54
In Progress

Explaining Clamshell Heat Exchanger

Alright, everyone, in this section, we’re going to delve into the world of clamshell heat exchangers. Clamshell heat exchangers represent one of the oldest types of heat exchangers, consisting essentially of two pieces of metal joined together and welded along the top. We’re focusing on a slightly more modern iteration of the clamshell design, yet its foundational structure remains the same: two pieces of metal connected to form the heat exchanger. Specifically, we’re looking at a model that I believe to be a Lennox, identifiable by its distinct curve. Lennox introduced the DuraCurve unit for a period, aiming to enhance efficiency by incorporating a curve designed to decelerate the heat movement within the exchanger before it exits through the flue pipe.

However, this design has shown a propensity for failure, leading Lennox and other manufacturers to eventually move away from this model. The bending of the metal, integral to creating the curve, inherently weakens it, making the metal thinner at the bends. This process concentrates heat at these points, leading to heightened thermal stress.

The primary points of failure in this heater are located at these bends. Extracting the heat exchanger for inspection is challenging and generally not recommended. Instead, I advocate for a hydro scan for thorough examination. This involves using a Hudson sprayer filled with a soap and water solution, removing the blower motor for access, and spraying the mixture into the chamber, focusing particularly on the rear corner—the hottest part of these clamshell exchangers. The flames direct towards the back, concentrating heat away from the areas where air flows up the middle.

You’ll want to inspect these “turbs,” or turbulence-inducing areas, for the majority of failures. The simplest method is to spray the water and soap mixture underneath and observe. If you spot water inside the chamber through a camera or flashlight positioned where the burners enter, it indicates a failure. This is a clear sign that the heater needs to be shut off and red-tagged for safety.

Occasionally, you might encounter a clamshell heat exchanger that is a single, solid piece welded together. However, discovering a crack in the firebox typically means it’s time to discuss replacement options with the customer. Given that clamshell units can be 20, 30, or even 40 years old, replacement is often the most viable solution. The American Gas Association recommends replacing the heat exchanger or the entire heater upon failure, and finding replacement parts for such aged units can be challenging.

This situation often presents an opportunity for a straightforward sale, provided you’ve established trust and credibility with your customer. Emphasize the simplicity of working on clamshell heat exchangers despite their age; many competitors may shy away from them due to their complexity. However, with careful reassembly and a thorough understanding of their structure, you’ll find they are not as daunting as they appear.


Your email address will not be published. Required fields are marked *