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1 although air-handler cabinets may be made of galvanized steel there are still areas that may be subject to corrosion
1 if the rooftop unit is subjected to a corrosive environment and cannot be installed in an area away from the
1 list some electronic temperature-sensing elements2 what acts as the primary control for all hvacr functions in a ddc
1 what can happen if the pressure drop through a heating or cooling coil control valve is excessive2 list some of the
1 why are direct digital control ddc systems sometimes referred to as energy-management systems2 what could cause
1 how does a refrigeration air dryer operate2 how would a humidity control operate what is an important consideration
1 what is the purpose of a high-pressure switch in a packaged air handler2 what will an air-quality sensor typically
1 what are the common types of preheaters2 what are the three common classifications for commercial air-distribution
1 what is an advantage of face and bypass control dampers2 what is the difference between a draw-through air system and
1 what is the purpose of a filter status differential pressure switch2 why are steam or electric reheaters inefficient3
1 utilities can be run to the rooftop unit in what two ways2 what code specifies the correct way for electrical
1 what are the two possible duct configurations for a rooftop unit2 if using a heat pump rooftop unit why is proper
1 describe one method to determine if a ladder is correctly set up2 besides the manufacturer where can the rooftop unit
1 describe the difference between a flooded and a dry direct expansion type cooler2 what are some advantages and
1 what is the function of a purge recovery unit2 what precaution should be taken whenever leak testing a lowpressure
1 why is a cooler shell and suction line insulated on a unit that is located indoors2 explain the operation of lead and
1 what type of capacity control is used for a centrifugal compressor that is driven by a constant-speed motor2 what can
1 what happens to the flash gas formed in a chiller economizer2 what is the purpose of an oil-return system for a
1 define hydronics what was the common choice for hydronic piping in the past and how is that changing2 what are the
1 why is it important when working on electrical components such as pump motors to make sure that all of the water in
1 what are the advantages of radiant floor heating2 describe a series loop single-circuit hot-water piping system3 what
1 what is the advantage to a two-pipe system direct return2 how does a two-pipe system reverse return differ from a
1 how is the water returned from a zone to the boiler2 how does a motorized zone control valve work 18 what are mixing
1 what is the typical return-water temperature for a gas-fired boiler2 what is the working pressure for a low-pressure
1 what is the working pressure for medium- and high-pressure boilers2 what materials are boilers commonly made from3