NATE Heat Pump Exam
A client is worried that during the heating season heavy ice builds up on one aspect of the
concrete device pad and coil. The rest of the coil is clear of ice and the warmth pump is
assembly the heating wishes of the residence. What is most likely the motive of the hassle?
A: High winds on that facet of the out of doors unit
B: The outside unit isn't always degree
C: There is more refrigerant on that facet of the coil
D: A defrost problem exists - ANS-B: The outside unit isn't degree
A heat pump defrosts even if there is no ice at the outdoor coil. Which of the subsequent is
maximum likely the problem?
A: The defrost time clock is set for too brief a cycle
B: The out of doors coil is grimy and the gadget makes use of a pressure differential kind of
defrost initiation
C: The sensing bulb of the defrost control is hooked up too close to the lowest of the outdoor
coil
D: Each of those should cause the problem - ANS-D: Each of those may want to reason the
problem
A heat pump is operating within the heating mode. The lower the outdoor air temperature, the:
A: More efficient the heat pump turns into
B: Higher the SEER rating
C: Higher the compression ratio
D: Lower the stability factor - ANS-C: Higher the compression ratio
A warmness pump working in the cooling mode could be predicted to have a return-to-supply air
temperature differential inside the variety of:
A: five to six tiers
B: five to eight ranges
, C: 8 to twelve stages
D: 18 to 22 stages - ANS-D: 18 to 22 stages
A heat pump running usually in the heating mode could be expected to have a supply air
temperature within the variety of:
A: 70 to eighty ranges
B: 80 to 90 levels
C: 85 to one hundred and five levels
D: a hundred to one hundred thirty tiers - ANS-C: eighty five to one hundred and five levels
A technician places a warmness pump into the auxiliary electric powered heating mode with the
compressor de-energized. He measures a temperature rise between the return and deliver air of
40 degrees. The measured voltage at the electrical factors is precisely 222 volts and the
measured amperage of the heaters is 60 amps. Using the equation CFM = BTU divided by
using 1.08 x TD, what is the CFM of the system?
A: 825 CFM
B: 950 CFM
C: 1055 CFM
D: 1500 CFM - ANS-C: 1055 CFM
222 x 60 = thirteen,320watts
thirteen,320 / a thousand = thirteen.32 Kw
btuh = 13.32 x 3415 = 45,488
cfm =((forty five,488 / (1.08 x forty))
cfm = 45,.2 = 1052.Ninety five
A thermistor is an:
A: Electronic temperature sensor that adjustments its resistance with modifications in
temperature
B: Electronic pressure sensor that changes its resistance with changes in stress
C: Electromechanical thermostat used to terminate the defrost cycle whilst outdoor coil is
obvious of ice and frost
A client is worried that during the heating season heavy ice builds up on one aspect of the
concrete device pad and coil. The rest of the coil is clear of ice and the warmth pump is
assembly the heating wishes of the residence. What is most likely the motive of the hassle?
A: High winds on that facet of the out of doors unit
B: The outside unit isn't always degree
C: There is more refrigerant on that facet of the coil
D: A defrost problem exists - ANS-B: The outside unit isn't degree
A heat pump defrosts even if there is no ice at the outdoor coil. Which of the subsequent is
maximum likely the problem?
A: The defrost time clock is set for too brief a cycle
B: The out of doors coil is grimy and the gadget makes use of a pressure differential kind of
defrost initiation
C: The sensing bulb of the defrost control is hooked up too close to the lowest of the outdoor
coil
D: Each of those should cause the problem - ANS-D: Each of those may want to reason the
problem
A heat pump is operating within the heating mode. The lower the outdoor air temperature, the:
A: More efficient the heat pump turns into
B: Higher the SEER rating
C: Higher the compression ratio
D: Lower the stability factor - ANS-C: Higher the compression ratio
A warmness pump working in the cooling mode could be predicted to have a return-to-supply air
temperature differential inside the variety of:
A: five to six tiers
B: five to eight ranges
, C: 8 to twelve stages
D: 18 to 22 stages - ANS-D: 18 to 22 stages
A heat pump running usually in the heating mode could be expected to have a supply air
temperature within the variety of:
A: 70 to eighty ranges
B: 80 to 90 levels
C: 85 to one hundred and five levels
D: a hundred to one hundred thirty tiers - ANS-C: eighty five to one hundred and five levels
A technician places a warmness pump into the auxiliary electric powered heating mode with the
compressor de-energized. He measures a temperature rise between the return and deliver air of
40 degrees. The measured voltage at the electrical factors is precisely 222 volts and the
measured amperage of the heaters is 60 amps. Using the equation CFM = BTU divided by
using 1.08 x TD, what is the CFM of the system?
A: 825 CFM
B: 950 CFM
C: 1055 CFM
D: 1500 CFM - ANS-C: 1055 CFM
222 x 60 = thirteen,320watts
thirteen,320 / a thousand = thirteen.32 Kw
btuh = 13.32 x 3415 = 45,488
cfm =((forty five,488 / (1.08 x forty))
cfm = 45,.2 = 1052.Ninety five
A thermistor is an:
A: Electronic temperature sensor that adjustments its resistance with modifications in
temperature
B: Electronic pressure sensor that changes its resistance with changes in stress
C: Electromechanical thermostat used to terminate the defrost cycle whilst outdoor coil is
obvious of ice and frost
