86 6 what types of defrost methods can be used for

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86-6) What types of defrost methods can be used for refrigerated case coils?
86-7) Explain how an adaptive defrost cycle operates.
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?
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