What can be done to prevent refrigerant from being drained or migrating back to the compressor during the off cycle?
What will be an ideal response?
Traps in the discharge piping may be required as well as suction line accumulators and crankcase heaters. A hard shutoff expansion valve and liquid line solenoid can keep the liquid refrigerant in the high side of the system.
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What type of diagrams are the simplest drawings used in the process industries?
A) Process Flow Diagrams (PFDs) B) Block Flow Diagrams (BFDs) C) Engineering Flow Diagrams (EFDs) D) Piping and Instrumentation Diagrams (P&IDs)
What type of transformer does the NEC require in all distribution circuits except those circuits assigned to autotransformers?
What will be an ideal response?
A relay control system requires:
A) Adjustable relays, which can compensate for voltage drop in the control signals. B) A wire for each system function. C) A communication bus for all the relay operation. D) A separate control board for each relay on the system.
When installing a double riser in a commercial refrigeration system, which of the following statements is true?
A) The combined areas of the risers should be greater than the area of the suction line. B) The combined areas of the risers should be less than the area of the suction line. C) The combined areas of the risers should be equal to the area of the suction line. D) Both of the risers should be the same size.