NATE Heat Pump
R-22 vapor line diameters and lengths are typically specified for a vapor pressure drop
that does not exceed... - ANS-6-7 psi or 6°F
The primary purpose of using flux when soldering copper or brass parts is to... -
ANS-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... - ANS-Prevent excessive ice can build up on the
bottom of the coil and reduce capacity
The component used to reduce sound transmission and regent water leaks of a
packaged heat pump installed on a roof is... - ANS-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... - ANS-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... - ANS-Be damaged if energized
In order for evacuation to be considered complete, a heat pump refrigerant circuit
should be evacuated to a vacuum pressure of... - ANS-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 o be 5 pounds 10oz. The line set uses a 3/8 inch
liquid line and is 25 feet long. The manufacturer's instruction she specifies 0.6 oz of
refrigerant to be added for... - ANS-each added foot of refrigerant line length so the total
regrigerrant charge for the system would be 6 pounds
Drive slips are typically installed on... - ANS-the shorter sides of rectangular duct
To properly set a heat anticipator it is necessary to check... - ANS-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... - ANS-coil TD
The smallest refrigerant leak that an electronic leak detector should be capable of
sensing is... - ANS-0.05 oz. per year
When checking the pressure in an operating system with a manifold gauge set... -
ANS-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 ... - ANS-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... -
ANS-1323
A residential supply diffuser that is noisy because of a loose vane is best serviced by... -
ANS-replacing the filter
When performing preventive maintenance on a heat pump the technician should... -
ANS-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 ... - ANS-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 inspection find a liquid
line that has condensation on it. The most likely cause would be... - ANS-the liquid linen
is restricted
A reason for cool air complaints when a heat pump is operating in the heating cycle is...
- ANS-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 / aux heat on 115(F)
- Return air temp / auxillary heat on 70(F)
R-22 vapor line diameters and lengths are typically specified for a vapor pressure drop
that does not exceed... - ANS-6-7 psi or 6°F
The primary purpose of using flux when soldering copper or brass parts is to... -
ANS-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... - ANS-Prevent excessive ice can build up on the
bottom of the coil and reduce capacity
The component used to reduce sound transmission and regent water leaks of a
packaged heat pump installed on a roof is... - ANS-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... - ANS-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... - ANS-Be damaged if energized
In order for evacuation to be considered complete, a heat pump refrigerant circuit
should be evacuated to a vacuum pressure of... - ANS-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 o be 5 pounds 10oz. The line set uses a 3/8 inch
liquid line and is 25 feet long. The manufacturer's instruction she specifies 0.6 oz of
refrigerant to be added for... - ANS-each added foot of refrigerant line length so the total
regrigerrant charge for the system would be 6 pounds
Drive slips are typically installed on... - ANS-the shorter sides of rectangular duct
To properly set a heat anticipator it is necessary to check... - ANS-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... - ANS-coil TD
The smallest refrigerant leak that an electronic leak detector should be capable of
sensing is... - ANS-0.05 oz. per year
When checking the pressure in an operating system with a manifold gauge set... -
ANS-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 ... - ANS-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... -
ANS-1323
A residential supply diffuser that is noisy because of a loose vane is best serviced by... -
ANS-replacing the filter
When performing preventive maintenance on a heat pump the technician should... -
ANS-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 ... - ANS-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 inspection find a liquid
line that has condensation on it. The most likely cause would be... - ANS-the liquid linen
is restricted
A reason for cool air complaints when a heat pump is operating in the heating cycle is...
- ANS-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 / aux heat on 115(F)
- Return air temp / auxillary heat on 70(F)
