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Nate Heat Pump exam/46 Questions and Answers A+ Graded
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Nate Heat Pump exam/46 Questionsand Answers A+ Graded
R-22 vapor line diameters and lengths are typically specified for a - -Vapor
pressure drop that does not exceed 6 - 7 psi or 6°F
-The primary purpose of using flux when soldering copper or brass parts is
to - -Prevent oxidation
-The water that results from a defrost cycle of an air to air heat pump
(runoff) must - -Drain off and away from the outdoor coil to prevent
excessive ice can build up on the bottom of the coil and reduce capacity
-The component used to reduce sound transmission and prevent water leaks
of a packaged heat pump installed on a roof is - -The curb gasket
-On some installations, a heat pump indoor coil can be installed on an
existing, operable, fossil fuel furnace.
When this type of installation is done you need to add a control so that - -
The furnace and heat pump do not operate at the same time in normal
heating
-When under a deep vacuum, a hermetic refrigeration compressor's motor
windings could be - -Damaged if energized
-In order for an evacuation to be considered complete - -A heat pump
refrigerant circuit should be evacuated to a vacuum pressure of 500 microns
or below
-A system is supplied from the factory with charge for a: 15 foot line set.
The data plate shows the required system charge to be 5 pounds 10 ounces.
The line set uses a 3/8 inch liquid line and is 25 feet long.
The manufacturer's instruction sheet specifies 0.6 ounces of refrigerant to be
added for each added foot of refrigerant line length so - -The total
refrigerant charge for the system would be
6 pounds
-Drive slips are typically installed on the - -Shorter sides of rectangular duct
-To properly set a heat anticipator it is necessary to - -Check the heating
control circuit amperage draw
-A heat pump operating in normal ice free conditions maintains a certain
temperature difference between the outdoor coil temperature and the
, surrounding outdoor ambient - -This temperature difference is referred to as
coil TD
-The smallest refrigerant leak that an electronic leak detector should be
capable of sensing is - -0.05 oz. per year
-When checking the pressures in an operating system with a manifold gauge
set - -Refrigerant oil in a hose will have no effect on the gauge reading
-At sea level, a gauge pressure of 35 psig
is equal to an - -Absolute pressure of 49.7 psia
-A technician measures the return air temperature of a 100,000 Btu output
furnace to be 65°F and the supply side air temperature is 135°F - -The CFM
would be 1323
-A residential supply diffuser that is noisy because of a loose vane is best
serviced by - -Replacing the diffuser
-When performing preventive maintenance on a heat pump the technician
should check the outdoor fan to be certain that the - -Fan runs freely with no
binding
-What is the effect of 170 volts supplied to a 208/230 volt compressor - -
Would cause a current increase and the motor may trip on overload
-On a service call for a cooling problem with a heat pump, your inspections
find a liquid line that has condensation on it - -The most likely cause would
be the liquid line is restricted.
-A reason for cool air complaints when a heat pump is operating in the
heating cycle - -Excessive supply air velocities
-The following measurements are recorded on an operating heat pump
system. The heat pump is operating with the compressor only with no
auxiliary heat
~Heat pump only supply air temperature 92°F
~Heat pump only return air temperature 70°F
~Outdoor temperature 54°F
~Supply air temp. /auxiliary heat ON 115°F
~Return air temp. /auxiliary heat ON 70°F
~CFM 1228 - -The heating capacity of the unit in Btu/h would be 29,177
Btu/h
-A dirty or clogged air filter in an operating heat pump system can cause by
- -Inadequate heating
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