UNIT 86 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX
86-1) What is the most common type of system used in “traditional” supermarkets?
86-2) How many compressors are typically found on a compressor rack?
86-3) An un-even parallel rack of one ten and two twenty horsepower compressors will
provide for what horsepower combinations? –
86-4) What type of pressure control can be used for rooftop air-cooled condensers?
86-5) How does a pulse width modulated expansion valve operate?
86-6) What types of defrost methods can be used for refrigerated case coils?
86-7) Explain how an adaptive defrost cycle operates.
Adaptive defrost systems initiate the defrost system based upon measured
86-8) What is the advantage of a case coil secondary loop system?
86-9) What types of fluids are used for secondary loop systems?
86-10) How is a distributed system arranged in a supermarket?
86-11) What is the advantage to variable frequency drive motors?
86-12) Secondary loop fluid Potassium Formate is compatible with which piping
materials?
86-13) Do enclosed display cases use more or less energy than open cases?
86-14) How does a series heat reclaim system operate?
86-15) What is the disadvantage of a parallel heat reclaim system that has the reclaim
coil located in the air handler?
86-16) How do open display cases maintain the temperature within the case without
any doors?
86-17) The temperature is monitored in an open display case at what location?
86-18) How many air curtains are used in a multi-deck open display freezer?
86-19) What are the advantages of CO2 as a refrigerant?
86-20) What are the disadvantages of CO2 as a refrigerant?