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HVAC NATE HEAT PUMP ACTUAL EXAM
PREP 2026 ALL QUESTIONS AND CORRECT
DETAILED ANSWERS | RATED A+ | NEW
AND REVISED
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. How much
refrigerant is needed to completely charge the system? - ANSWER- 6lbs
Where are drive slips typically installed? - ANSWER- On the shorter
sides of rectangular duct.
What is a necessary check to properly set a heat anticipator? -
ANSWER- 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. What is this temperature referred to as? -
ANSWER- Coil TD.
What is the smallest refrigerant leak that an electronic leak detector
should be capable of sensing? - ANSWER- .o5oz per year.
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When checking the pressures in an operating system with a manifold
gauge set, will refrigerant oil in a hose will have an effect on the gauge?
- ANSWER- No
What is the absolute pressure at sea level if a gauge pressure is 35 psig?
- ANSWER- 49.7psia
100,000 BTUH output furnace.
Return air temp is 65F.
Supply air is 135F.
What is the CFM? - ANSWER- 1323CFM
What is the best method of repair when a residential supply diffuser is
noisy because of a loose vane? - ANSWER- Replace the diffuser.
When performing preventive maintenance on a heat pump what should
the technician check and why? - ANSWER- Outdoor fan. To be certain
it runs freely with no binding.
What is the effect of 170 volts supplied to a 208/230 volt compressor? -
ANSWER- Would cause the current to increase and the motor may trip
on overload.
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On a service call for a cooling problem with a heat pump, your
inspections find a liquid line that has condensation on it. What is most
likely to cause this? - ANSWER- Restriction in the liquid line.
What is a reason for cool air complaints when a heat pump is operating
in the heating cycle? - 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. /auxiliary heat ON 115°F
• Return air temp. /auxiliary heat ON 70°F
• CFM 1228
What is the heating capacity in BTUH? - ANSWER- 29,177 BTU/H
HVAC NATE HEAT PUMP ACTUAL EXAM
PREP 2026 ALL QUESTIONS AND CORRECT
DETAILED ANSWERS | RATED A+ | NEW
AND REVISED
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. How much
refrigerant is needed to completely charge the system? - ANSWER- 6lbs
Where are drive slips typically installed? - ANSWER- On the shorter
sides of rectangular duct.
What is a necessary check to properly set a heat anticipator? -
ANSWER- 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. What is this temperature referred to as? -
ANSWER- Coil TD.
What is the smallest refrigerant leak that an electronic leak detector
should be capable of sensing? - ANSWER- .o5oz per year.
,2|Page
When checking the pressures in an operating system with a manifold
gauge set, will refrigerant oil in a hose will have an effect on the gauge?
- ANSWER- No
What is the absolute pressure at sea level if a gauge pressure is 35 psig?
- ANSWER- 49.7psia
100,000 BTUH output furnace.
Return air temp is 65F.
Supply air is 135F.
What is the CFM? - ANSWER- 1323CFM
What is the best method of repair when a residential supply diffuser is
noisy because of a loose vane? - ANSWER- Replace the diffuser.
When performing preventive maintenance on a heat pump what should
the technician check and why? - ANSWER- Outdoor fan. To be certain
it runs freely with no binding.
What is the effect of 170 volts supplied to a 208/230 volt compressor? -
ANSWER- Would cause the current to increase and the motor may trip
on overload.
, 3|Page
On a service call for a cooling problem with a heat pump, your
inspections find a liquid line that has condensation on it. What is most
likely to cause this? - ANSWER- Restriction in the liquid line.
What is a reason for cool air complaints when a heat pump is operating
in the heating cycle? - 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. /auxiliary heat ON 115°F
• Return air temp. /auxiliary heat ON 70°F
• CFM 1228
What is the heating capacity in BTUH? - ANSWER- 29,177 BTU/H
