HVAC NATE Heat Pump Exam (New 2024/ 2025 Update) Questions and Verified Answers 100% Correct | A Grade
QUESTION
In order to troubleshoot a load
... [Show More] controlled by a control string, what should the technician check first?
Answer:
Proper voltage applied across the load.
QUESTION
The technician suspects that an outdoor thermostat used to bring on auxiliary heat may be out of calibration. The thermostat is a close-on-fall type that is adjustable. What is one method for checking the thermostat calibration?
Answer:
Manually rotate the shaft until the thermostat closes and compare the dial setting to an accurate outdoor temperature reading plus 10°F
QUESTION
When must the installer must be certain to plumb the cabinet so its sides are vertical?
Answer:
When changing out an evaporator coil.
QUESTION
What is the recommended maximum external static pressure used for heating and cooling equipment with blowers for 5 ton of cooling or less?
Answer:
0.1 in W.C
QUESTION
When a balancing check of a newly installed duct what needs to happen?
Answer:
Dampers should be open completely in all rooms.
QUESTION
Why is operating sound is a consideration in the location of a condensing unit?
Answer:
Because excessive noise could be disruptive to the customer
QUESTION
A technician has determined a supply in a flexible duct system is leaking. What should be checked?
Answer:
All connections inner and outer layers.
QUESTION
What is sensible heat ratio?
Answer:
sensible removed ÷ total heat removed
QUESTION
Service site conditions are:
• House feels "drafty" in cooling
• 3½ ton split system
• High supply face velocities
• Ductwork is properly sized
• Total CFM 1400
What does this indicate?
Answer:
These readings indicate the system is operating normally but the supply registers are too restrictive
QUESTION
When a wet bulb reading is very close to the dry bulb reading from the same instrument, what does this indicate?
Answer:
Relative humidity is high.
QUESTION
What measurements would be needed to properly evaluate a complaint of "drafty" operation with a heating system?
Answer:
System TD, Drop, and Static Pressure
QUESTION
What kind of energy does the condenser remove from the refrigerant?
Answer:
Sensible heat and Latent heat
QUESTION
Where does refrigerant boil?
Answer:
In the Evaporator.
QUESTION
What is the common suction line on a heat pump connected to?
Answer:
The indoor coil and the compressor.
QUESTION
What are the two generally used methods for changing capacity on demand in a heat pump?
Answer:
Two speed compressor. Two stage thermostat
QUESTION
What are the three things that happen when a heat pump is cycled into the defrost mode?
Answer:
Reversing valve switches to cooling mode, Outdoor fan is shut off, and auxiliary heat is energized. [Show Less]