The Perils of Overcharging

摘要

Tlhere's an old saying that too much of anything - even a good thing -isn't necessarily a good thing. That certainly holds true for refrigerants. The system check below shows a refrigeration system with an overcharge of refrigerant. The system is a low-temperature thermostatic expansion valve (TXV)/receiver system incorporating R-134a as the refrigerant. Measured Values Compressor Discharge Temperature: 240°F; Condenser Outlet Temperature: 90°; Evaporator Outlet Temperature: 15°; Compressor In Temperature: 25°; Ambient Temperature: 70°; Box Temperature: 10°; Low Side (Evaporator) Pressure: 8.8 psig (5°); and High Side (Condensing) Pressure: 172 psig (120°).