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1 how is the overcurrent protection sized for an electric furnace2 discuss the effect of reduced voltage on electric
1 list three ways of checking the heating elements of an electric furnace2 describe how a clamp-on ammeter can be used
1 what are the two main types of defrost controls used on heat pumps today2 describe what happens during the defrost
1 what is the standard ceiling height in a residence name the two most common problems with basements2 name the
1 how is the water flow through a water-source heat pump measured2 what steps must be taken when installing
1 what are the indications a check valve has stuck closed on an outside coil2 name the four most predominant defrost
1 when installing a new valve it should be protected from getting too hot what is the maximum temperature the valve
1 why is the cooling temperature difference often different from the difference between the indoor and outdoor
1 what would the htm be for a building panel with a u value of 08 and a temperature difference of 40degf2 what is meant
1 list the factors to consider when choosing a supply register2 what are the noise criteria curves3 using figure 71-25
1 tell why actual motor voltage and amperage should be field measured and logged under full load conditions2 in a
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