In a refrigeration system, where multiple evaporators are operating at different temperatures, and serviced by a single compressor and condenser, the control of individual evaporator coil temperature minimums should be carried out by adjustment of which individual valve?
• Multiple evaporators on one compressor and how pressure is controlled for each coil • Difference between a thermostatic expansion valve (TXV) and an evaporator pressure regulating (EPR) valve • How evaporating pressure relates to evaporating temperature in a refrigeration system
• Which component directly limits or maintains the minimum pressure/temperature in an individual evaporator when all are sharing the same suction line? • Does a TXV normally control superheat or coil pressure/temperature? What about an EPR valve? • If you want to keep one coil from getting too cold (to avoid frost or product damage), which valve setting would you adjust on that coil?
• Identify which valve is installed in the suction line at the outlet of the evaporator versus in the liquid line at the inlet • Confirm which device’s primary function is maintaining a minimum evaporating pressure rather than controlling box air temperature • Make sure you distinguish between controlling superheat, controlling coil pressure/temperature, and controlling box air temperature—each function belongs to a different device
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