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Articles by John Tomczyk
The thermostatic expansion valve (TXV or TEV) is a metering device located between the liquid line and the evaporator.
John Tomczyk, Professor of HVACR at Ferris State University and co-author of Refrigeration and Air Conditioning Technology, discusses refrigerant undercharge.
Clear, concise, and accurate communication between service technicians, parts suppliers, customers, and the home shop is rapidly gaining importance as the HVACR field transitions and becomes more technically oriented.
During the off cycle, or especially during a long shutdown, refrigerant will want to travel, or migrate, to a place where the pressure is the lowest.
When a refrigeration system has lost most of its refrigerant charge in a short period of time, the leak is probably significant and should be easy to find.
Compressor overheating is usually caused from high compression ratios. High compression ratios can be caused from a combination of high condensing pressures (temperatures) and low suction (evaporating) pressures.
The evaporator is a major component in the refrigeration system, and an efficient evaporator plays a key role in saving energy.