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45-12) What are the major disadvantages of a stand-alone air-conditioning unit?
45-13) Why are heat pumps often used on split systems?
45-14) What are some advantages of mini-split systems?
45-15) What is the concern about radon gas?
45-16) Explain why split systems were developed.
For many air conditioning systems, it is not practical to place all components
45-17) Why is a quality installation one of the most important phases of the
manufacturing process?
45-18) Name the four major components of a condensing unit.
45-19) Describe why it is important to replace a fan motor with one of the exact same
RPM.
Some operate around 1000 rpm while others may operate around 800 rpm.
45-20) In a condenser coil why is the coil tube depth limited?
UNIT 46 REVIEW QUESTIONS ANSWER KEY GO BACK TO INDEX
46-1) List ways that mini-split systems differ from traditional ducted split systems.
Traditional split systems split the unit into two parts. They are intended to
46-2) List the types of indoor units available for use in mini-split systems.
46-3) Where is the metering device usually located on a mini-split system?
46-4) Why are both lines of a mini-split system insulated?
46-5) How are the refrigerant lines of a mini-split system connected to the unit?
46-6) What is the difference between a flare made for older refrigerants, such as
R-22, and a flare made for R-410a?
46-7) Why do many mini-split system installations require a condensate pump?
46-8) Describe how a two-piece condensate pump works.
46-9) How are a mini-split systems typically wired?
46-10) What type of controls do most mini-split systems use?
46-11) What is the difference between a mini-split system and a multisplit system?
46-12) Why can a multispilt system be considered a form of zoning?
46-13) Explain the concept of load diversity.
Load diversity describes how the heat load shifts through the day and through
46-14) What type of metering device do most multisplit systems use?
46-15) How does the compressor on a multisplit system manage to change
capacity between feeding a single indoor coil and feeding four indoor coils?
46-16) On a multisplit system, why is it acceptable for the total installed indoor
unit capacity to exceed the capacity of the outdoor unit?
46-17) How does a VRF system differ from a multisplit system?
46-18) How does the outdoor unit of a VRF system connect to all the indoor units?
46-19) What is the difference between a heat pump VRF system and a heat
recovery VRF system?
46-20) Why should brazing be done using a nitrogen purge?
46-21) Why should manufacturer-recommended branch fittings be used instead of
standard tees when installing a VRF system?
46-22) How should a branching tube be positioned?
46-23) What is the purpose of a branching box?
46-24) What three lines are used with a three-pipe heat recovery system which
uses individual branch selectors?
46-25) What are the three lines which travel between the outdoor unit and the
multiplexed branch selector in a three-pipe multiplexed heat recovery system?
46-26) What are the two lines that travel between the outdoor unit and the
multiplexed branch selector in a two-pipe heat recovery system?
46-27) Describe the power wiring of a VRF system.
VRF systems are commercial systems. The outdoor units are normally
46-28) Describe the control wiring for a VRF system.
VRF systems use communicating controls, which normally require only two
control wires. The controls may be daisy chained from one indoor unit to the
