NATE Heat Pump Exam and Answers
An electronic leak detector can typically detect a leak rate as small as? - ✔✔1/2 ounce per year
Heat pumps are typically sized for the conditioned space based on the? - ✔✔Cooling load
Which of the following is used to make accurate residential load calculations - ✔✔Acca manual
J
When changing out a indoor coil the installer must be certain to: - ✔✔Plumb down the cabinets
so it is vertical
What are the effect of 170 volts supplied to a 208/230 volt compressor - ✔✔Current increases
and the motor may trip on overload
Refrigerant subcooling is a measurement of the difference between - ✔✔Condensing
saturation temperature and liquid line temperature
The voltage most often used to power the outdoor unit in a residential system - ✔✔240V single
phase
To properly set a heat anticipator it is necessary to check - ✔✔B. Heating control circuit
amperage draw
What can cause a lower than normal suction pressure - ✔✔D. A restricted drier
What is a primary consideration when bending soft copper tubing into a bend of any radius -
✔✔The cross-sectional are of the tube must not be significantly reduce
, When is the vapor line of a residential heat pump in cooling mode a concern - ✔✔Touting
refrigerant line within a wall
Bent vanes on a direct drive blower wheel in a air handler can cause - ✔✔Loss of
airflow,excessive blower motor wear, and increased noise
A technician measures the return air temperature of a 100,000 btu output furnace to be 65f
and the supply side air 135f. What is the scfm - ✔✔1323
What would cause a voltage reading across a closed contact in a 24v circuit? - ✔✔Pitted or dirty
contacts
A reason for cool air complaints when a heat pump is operating in heating - ✔✔Excessive
supply air velocity
What is used to measure duct static pressure - ✔✔Differential pressure gauge
What are the first two checks typically made on an electrical control - ✔✔Presence of proper
input signals and proper output voltages
To more accurately sense the refrigerant temperature of horizontal suction line that are 1 1/2
or larger, a thermostatic expansion valve sensing bulb should be mounted in which position -
✔✔4 or 8 o'clock
The technician suspects that an outdoor thermostat used to bring on auxiliary heat may be out
of calibration. The thermostat is close-on-fall type that is adjustable. One method for checking
the thermostats calibration is to - ✔✔Manually rotate the shaft until the thermostat closes and
compare the dial setting to an accurate outdoor temperature
An electronic leak detector can typically detect a leak rate as small as? - ✔✔1/2 ounce per year
Heat pumps are typically sized for the conditioned space based on the? - ✔✔Cooling load
Which of the following is used to make accurate residential load calculations - ✔✔Acca manual
J
When changing out a indoor coil the installer must be certain to: - ✔✔Plumb down the cabinets
so it is vertical
What are the effect of 170 volts supplied to a 208/230 volt compressor - ✔✔Current increases
and the motor may trip on overload
Refrigerant subcooling is a measurement of the difference between - ✔✔Condensing
saturation temperature and liquid line temperature
The voltage most often used to power the outdoor unit in a residential system - ✔✔240V single
phase
To properly set a heat anticipator it is necessary to check - ✔✔B. Heating control circuit
amperage draw
What can cause a lower than normal suction pressure - ✔✔D. A restricted drier
What is a primary consideration when bending soft copper tubing into a bend of any radius -
✔✔The cross-sectional are of the tube must not be significantly reduce
, When is the vapor line of a residential heat pump in cooling mode a concern - ✔✔Touting
refrigerant line within a wall
Bent vanes on a direct drive blower wheel in a air handler can cause - ✔✔Loss of
airflow,excessive blower motor wear, and increased noise
A technician measures the return air temperature of a 100,000 btu output furnace to be 65f
and the supply side air 135f. What is the scfm - ✔✔1323
What would cause a voltage reading across a closed contact in a 24v circuit? - ✔✔Pitted or dirty
contacts
A reason for cool air complaints when a heat pump is operating in heating - ✔✔Excessive
supply air velocity
What is used to measure duct static pressure - ✔✔Differential pressure gauge
What are the first two checks typically made on an electrical control - ✔✔Presence of proper
input signals and proper output voltages
To more accurately sense the refrigerant temperature of horizontal suction line that are 1 1/2
or larger, a thermostatic expansion valve sensing bulb should be mounted in which position -
✔✔4 or 8 o'clock
The technician suspects that an outdoor thermostat used to bring on auxiliary heat may be out
of calibration. The thermostat is close-on-fall type that is adjustable. One method for checking
the thermostats calibration is to - ✔✔Manually rotate the shaft until the thermostat closes and
compare the dial setting to an accurate outdoor temperature
