UNIT 85 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX
85-1) What are three important items to consider in the design of commercial
refrigeration systems?
85-2) Refrigeration is divided into four broad areas based on the evaporator coil
temperature. What are these?
85-3) Food items like milk, cheese, and fresh fruit and vegetables are usually stored
at what temperatures?
85-4) Medium temperature refrigeration coil temperatures ranging from 32°F down
to 0°F are generally used for what applications?
85-5) A deep freeze would be an example of what coil temperature application?
85-6) List the essential components required for a basic refrigeration system.
85-7) List the important accessories common to commercial refrigeration systems
85-8) What type of system makes possible using a single compressor to control a
number of different case or fixture temperatures?
85-9) What would be installed in the suction line from the lowest temperature coil
in a multiple evaporator system?
85-10) List the three ways that evaporator temperature can be controlled
85-11) What type of system would be used when the refrigeration load varies over
a wide range, such as in a supermarket?
85-12) Explain a method used on walk-in coolers and freezers to help prevent
warm air from entering the case when the door is opened.
85-13) Why do commercial refrigeration systems need a defrost system?
85-14) List the ways an evaporator can be defrosted.
85-15) What are the three methods by which a defrost cycle can be terminated?
85-16) List some of the loads that must be considered when sizing the BTU
requirements of a walk-in cooler or freezer.
85-17) What are the four separate loads used to calculate the heat load for a
walk-in coolers or freezers?
85-18) What is the first step in selecting commercial refrigeration equipment for
new installations?
85-19) What are the approximate ventilation requirements for air-cooled
condensing units located in an indoor environment?
85-20) When locating an air cooled condenser outdoors, why must the system be
modified?
85-21) List at least three requirements when installing an evaporator coil in a
walk-in cooler or freezer.
1) The air pattern of the evaporator must envelop the entire room. 2) Never
install an evaporator above a door. 3) Do not install an evaporator coil in