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1 what type of heat pump is the most common and why2 what is the relationship between air-to-air heat pump heating
1 where is the permanent suction line always located on a reversing valve2 where is the permanent discharge line always
weight reduction in a bicycle crank arm for world record attempt hpvintroductionthe bicycle crank is the device that
1 list the physics principles that make heat pump operation possible2 why do most heat pumps have two metering devices3
1 what is the difference between a cop and an hspf2 why are the coils in an air-source heat pump referred to as the
1 why are accumulators andor charge compensator tanks necessary in air-source heat pumps2 describe the operation of the
1 list the types of heat pumps available by combinations of heat source and heat sink2 why is a heat pump called a heat
1 how can overlubricating a blower motor be detrimental2 what are the two general types of sequencers used on electric
1 what should always be checked when replacing a transformer2 explain how a stuck heating sequencer can keep the fan
1 a technician reads 240 v across the thermal overload to the first strip heater on an electric furnace what does this
1 a pressure-time-temperature defrost system goes into defrost with very little frost on the bottom of the coil
1 what are the indications a check valve has stuck closed on an outside coil2 name the four most predominant defrost
1 when a heat pump system is in the heating mode and there is an increase in the temperature rise what does this
1 how can heat be considered a form of pollution2 how is heat transferred in a heat pump ground loop3 what type of
1 why are the insulated water tanks for heat pump systems referred to as buffer tanks2 where is the compressor located
1 what site conditions should be taken into account when considering the installation of a ground-source heat pump2
1 why dont water-source systems have a defrost cycle2 explain the difference between an open loop and a closed loop3
1 how does a heat pump hot-water heater work2 what is the difference between a mini-split system and a traditional
1 describe the operation of a dual-fuel heat pump operating below the balance point2 what is the difference between
1 what is the purpose of the outdoor air thermostat2 what determines which metering device is active3 where in the
1 why must a heat pump indoor coil be able to withstand higher pressures than a regular air-conditioning evaporator
1 what are the two main types of defrost controls used on heat pumps today2 describe what happens during the defrost
1 name three pollutant areas that would be category2 what are the two most common pollutant pathways3 what is the best
1 define iaq what needs to be addressed to achieve acceptable iaq2 what is amplification explain the technicians role