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Inverter Driven: Signal Wire

By Dan Applegate Though at first quickly evolving, the DFS/mini-split equipment has settled into a near-standardization: many of the systems work very much (and look very much) like the other. Of course there are variations amongst products, so always consult with your manufacturer (i.e. read the installation and service manuals) but there are some areas that have become common ground. Wiring from the outdoor unit to the indoor unit, for example, has become rather standard… Read More

Carbon Monoxide: Leaking Gas Valves

By David Richardson With the floods affecting central Kentucky right now, I thought it would be a good idea to revisit what happened here over 20 years ago. During that event, some HVAC technicians cleaned out water-logged gas valves as they tried to get furnaces running again. I’m sure many of you are shaking your heads since you know those valves could fail in the open position, spewing gas into the equipment and building. Read More

How to Improve Indoor Air Quality Part 2: Purification

By Katie Conigliaro, excerpted from CE News In our last blog post, we discussed sterilization as an effective method for improving indoor air quality by removing contaminants and debris from existing HVAC systems. However, sterilization is not the only means of improving indoor air quality, especially in commercial and residential spaces. More and more often these days, we see commercial building owners and homeowners install robust air purification systems to cut down on contaminants… Read More

Inverter Driven: No Gauges, Part 2

By Dan Applegate The old-school method for checking these compressors was pretty simple. Sometimes a slug of liquid oil or refrigerant would make its way back to the compressor, and if there were no suction accumulator it would be drawn into the compressor. Dan Applegate Compressors are pneumatic, not hydraulic; when the compressor piston would reach top dead center the compressor piston-to-valve clearance would be at its minimum, and since liquids can’t be compressed, the… Read More

Carbon Monoxide: The Importance of Light-Off CO

By David Richardson Many technicians who work on fuel-fired equipment will admit they have scorched their eyebrows when watching a burner light. It is a rite of passage among most seasoned technicians. What if there was a safer way to check ignition instead of sticking your face in front of a burner? Fortunately, there is, and it involves using a combustion analyzer. Anyone who has had the flame roll out or the doors… Read More

How to Improve Indoor Air Quality Part 1: Sterilization

By Katie Conigliaro, excerpted from CE News With people spending more time indoors than ever before, concerns over indoor air quality and its potential effects on health and wellness have also grown. Oftentimes, when you hear about improving indoor air quality, you hear about air purification and filtration systems. However, another solution to consider is air sterilization. By understanding how sterilization works and how it can benefit those working from home and in commercial… Read More
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