Heat exchangers

The connections between a furnace and duct system are rarely considered as a cause of cracked heat exchangers. Commonly repeated mistakes with return and supply duct connections significantly impact airflow and the length of time before you’re back for repairs. Let’s look at some these issues that may be killing airflow and the heat exchangers …
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CO - What Do You Know?

Many HVAC professionals assume the leading cause of carbon monoxide (CO) poisoning is a cracked heat exchanger. This assumption leads to inaccurate test methods that pass on from technician to technician. They try to assure customer safety, but unknowingly rely on misinformation. No one wins in this scenario — both the contractor and customer have …
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Avoid sharp turns

Flex ducts could be in imminent danger. A few months ago, I wrote about a recent proposal to severely limit the use of flexible (flex) ducts. Due to poor installation methods, the International Association of Plumbing and Mechanical Officials (IAPMO) is proposing to limit use of flexible duct to only five feet in length. How …
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Carbon monoxide (CO) poisoning is one of those scary issues that most HVAC professionals hope to never encounter. As with many frightening things we want to avoid, this doesn’t make those issues go away. The threat is very real even though contractors often turn a blind eye to it. With all the stories and reports …
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Flex duct cost savings

Flex duct versus metallic duct: for decades many considered duct material the key to how well an HVAC system delivers airflow to the conditioned space. You should start paying closer attention to this discussion. Events unfolding over the next few months could ultimately determine how much flexible duct you will be allowed to use when …
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Airflow has its own Bermuda Triangle

Airflow. It’s in our ventilation sytems. It’s the media through which our weather works. Off the South-Eastern coast of the United States, bounded by Miami (in Florida), San Juan (in Puerto Rico), and the north-Atlantic island of Bermuda, is an area known as the Bermuda Triangle. For years many ships and planes inexplicably disappeared when …
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When I was a kid, I didn’t know what my beliefs were, so I had a habit of constantly asking why. I questioned my mom and dad repeatedly on the things I didn’t understand. They patiently answered my questions and encouraged me to keep asking. If you’re a parent, you’ve no doubt experienced this with …
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Picture yourself troubleshooting the following CO call and think about the pattern that’s followed. Remember, you’re going to be the hero on this call! The Call Long-time customers of yours, the Smith family, have recently moved into a new home. The previous homeowners replaced their old furnace with a direct-vent 90% efficient condensing furnace before …
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There is so much more to installing a static pressure testing port than meets the eye. It involves drilling – a scary thing for both your service technicians and homeowner customers. The art of installing these ports involves more than the hardware and technology required to do it. There is a psychology to it. It …
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The Thermostatic Expansion Valve (TEV) has become the refrigerant metering device of choice for most HVACR manufacturers in the past decade. Over time, countless valves have been needlessly replaced because of low airflow affecting their operation. A basic understanding of TEV operation helps tie the effects of low airflow to proper operation of the valve. …
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