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1 do enclosed display cases use more or less energy than open cases2 how does a series heat-reclaim system operate3
1 how is a distributed system arranged in a supermarket2 what is the advantage to variable-frequency drive motors3
1 explain how an adaptive defrost cycle operates2 what is the advantage of a case coil secondary-loop system3 what
1 what type of pressure control can be used for rooftop aircooled condensers2 how does a pulse-width modulated
1 what is the most common type of system used in traditional supermarkets2 how many compressors are typically found on
1 when locating an air-cooled condenser outdoors why must the system be modified2 list at least three requirements when
1 what are the four separate loads used to calculate the heat load for walk-in coolers or freezers2 what is the first
1 outline a method of isolating an electrical fault using the process of elimination2 describe the process of
1 list some common questions customers ask service technicians2 explain what is meant by a systems approach to
1 why is it safer to cut out refrigeration components for removal rather than debraze them2 why are suction-line
1 why should a cleanup filter drier always be used after performing a system flush2 which refrigeration system
1 list the system characteristics that are checked when taking system baseline performance2 list the stages of system
1 what are the most common sources of refrigeration system contamination2 explain how contaminants from a previous
1 what are the most common types of refrigeration system contaminants introduced because of improper installation2 how
1 what side of an air-conditioning a coil generally needs cleaning2 how does the technician know which way to install
1 how can a worn belt be identified how is a temperature-pressure-relief valve on a hot water boiler tested2 describe
1 the supply voltage to a system drops below the minimum voltage when the unit is operated what could be causing this2
1 how does planned maintenance improve system reliability2 how can the technician determine what the system voltage
1 list operational checks to make during an air-conditioning planned maintenance service call2 why should caution be
1 list the four phases of a planned maintenance service call2 what is the purpose of checking the supply voltage both
1 what factors must be considered in equipment placement2 outline the correct brazing procedure for hard copper
1 list the associations that establish national standards for the hvacr industry2 what is the function of ahri3 what
1 is the motor operating at high speed or low speed when it is connected in series delta in parallel wye2 describe the
1 the rotating magnetic field of a two-pole motor travels 360 electrical degrees how many mechanical degrees does the
consider n - n1n2 identical cells each of emf e and internal resistance r suppose n cells are joined in series to form