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Low HVAC Airflow Hurts TEV Operation

May 11th, 2016 | Posted by David Richardson in David Richardson | Home - (0 Comments)

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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air conditioning, Airflow, Contracting, energy savings, HVAC, HVACR, Measure, mechanical systems technology, National Comfort Institute, NCI, Performance-based contracting, Pressure Testing, Superheat, TEVs, Thermostatic Expansion Valves, Valves

Confronting A Restrictive HVAC Air Filter

May 11th, 2016 | Posted by David Richardson in David Richardson | Home - (0 Comments)

It is often taught that to diagnose a restrictive air filter is as simple as a visual inspection to see if it’s plugged. Then, if the filter is dirty, replace it. Once this obvious defect is fixed, everything is assumed to work correctly. Could there be more to it? What if the new air filter …
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air conditioning, Contracting, heating, HVAC, Measure, mechanical systems technology, National Comfort Institute, NCI, Performance-based contracting, Pressure Drop, Pressure Testing, Static Pressure, Testing Port

Low HVAC Airflow Hurts TEV Operation

Confronting A Restrictive HVAC Air Filter

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