In addition to adjusting the box thermostat, for a direct expansion multiple-evaporator refrigeration system, a chill box may be converted to a freeze box by performing what action?
• Operation of a direct expansion multiple-evaporator system • Function of a back pressure regulating valve versus a solenoid valve • How evaporator pressure and temperature are related in refrigeration systems
• Which component in the system is specifically used to maintain a higher minimum pressure/temperature in a chill box compared to a freeze box? • If you want the chill box to get colder than normal, which control in the suction/return line would you need to change or bypass so the evaporator can pull down to a lower pressure? • Which option, if used incorrectly, would likely cause floodback to the compressor or unstable operation rather than simply changing the box’s operating temperature range?
• Identify which device is designed to hold back suction pressure from certain evaporators to keep them warmer than others • Verify which valve is used only for on/off liquid flow control rather than pressure/temperature control • Confirm which action would safely allow the chill box evaporator to operate at the same low pressure as a freeze box evaporator
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