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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
1 what is the ansigbi 01-2010 standard what are the five main rating system categories for leed certification2 what
1 what is the igcc and what does it serve to accomplish2 what are the i-codes what is the purpose of the astm
1 why is it important to meet the building standards during new construction rather than waiting until some later time
1 what was the first state to develop a mandatory green building standards code2 the calgreen code is established to do
1 why is the cost of owning a green building often less than the cost of owning a conventionally constructed building2
1 what is the space above the drop-in ceiling in a commercial building used for in the hvacr industry2 what must be
1 what is the most common material used for interior walls of residences2 what material is sometimes required by the
1 how is ductwork location affected by solid wood floor joists2why do contractors often favor a trussed roof system3
1 how does the carrier infinity control system differ from traditional low-voltage control systems2 what type of
1 how is the tubing used in ground-source systems joined2 describe how a solar-assisted heat pump works3 list the steps
1 how does the staging and sequence of operation for a dualfuel heat pump system differ from a traditional heat pump2
1 list the types of loops geothermal heat pumps can use2 what are the main considerations when sizing an air-source
computer systems architecturequestion 1what is polling used for what are the disadvantages of polling what is a better
1 explain the concept of variable air volume in a zoning system2 explain the difference between two-position and
1 explain the reason zone control systems need a method for handling excess air2 list the methods of handling the
1 why are zone control systems used2 list the components found in a basic zone control system3 what two general