HVAC NATE HEAT PUMP 171 2026 EXAM
REVIEW STUDY GUIDE BUNDLED QUESTIONS
AND ANSWERS PREMIUM
◉ Drive slips are typically installed on... Answer: the shorter sides of
rectangular duct
◉ To properly set a heat anticipator it is necessary to check...
Answer: 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... Answer: coil TD
◉ The smallest refrigerant leak that an electronic leak detector
should be capable of sensing is... Answer: 0.05 oz. per year
◉ When checking the pressure in an operating system with a
manifold gauge set... Answer: 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 ... Answer: 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... Answer: 1323
◉ A residential supply diffuser that is noisy because of a loose vane
is best serviced by... Answer: replacing the filter
◉ When performing preventive maintenance on a heat pump the
technician should... Answer: 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 ... Answer: 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... Answer: the liquid linen is restricted
◉ A reason for cool air complaints when a heat pump is operating in
the heating cycle is... Answer: 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)
- CFM 1228
The heating capacity of the unit in BTUh would be... Answer: 29,177
BTUh
◉ A dirty or clogged air filter in an operating heat pump system
can... Answer: be caused by inadequate heating
◉ To minimize noise problems in residential duct systems, what is
the range (recommended to maximum) of design air velocity in the
rectangular main supply trunk... Answer: is 700 to 900 fpm
◉ Proper ductwork connections and sealing is critical to good
system performance...
Conditions are:
- Return side air leak of 15% in a ventilated attic
REVIEW STUDY GUIDE BUNDLED QUESTIONS
AND ANSWERS PREMIUM
◉ Drive slips are typically installed on... Answer: the shorter sides of
rectangular duct
◉ To properly set a heat anticipator it is necessary to check...
Answer: 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... Answer: coil TD
◉ The smallest refrigerant leak that an electronic leak detector
should be capable of sensing is... Answer: 0.05 oz. per year
◉ When checking the pressure in an operating system with a
manifold gauge set... Answer: 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 ... Answer: 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... Answer: 1323
◉ A residential supply diffuser that is noisy because of a loose vane
is best serviced by... Answer: replacing the filter
◉ When performing preventive maintenance on a heat pump the
technician should... Answer: 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 ... Answer: 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... Answer: the liquid linen is restricted
◉ A reason for cool air complaints when a heat pump is operating in
the heating cycle is... Answer: 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)
- CFM 1228
The heating capacity of the unit in BTUh would be... Answer: 29,177
BTUh
◉ A dirty or clogged air filter in an operating heat pump system
can... Answer: be caused by inadequate heating
◉ To minimize noise problems in residential duct systems, what is
the range (recommended to maximum) of design air velocity in the
rectangular main supply trunk... Answer: is 700 to 900 fpm
◉ Proper ductwork connections and sealing is critical to good
system performance...
Conditions are:
- Return side air leak of 15% in a ventilated attic
