NATE ICE Heat Pump questions and answers
2026\2027 A+ Grade
A correct statement regarding the outdoor coil of a heat pump is that damage may result if the:
- correct answer defrost water does not drain from the coil.
A dirty air filter in a heat pump operating in the heating mode could result in:
- correct answer excessive head pressure.
A dirty air filter on a heat pump system will result in:
- correct answer high head pressure in the heat mode and low suction pressure in the cool mode.
A fan delay can add cooling efficiency by:
- correct answer operating the indoor blower after compressor shut-down
A heat pump that uses a piston-type metering device on the indoor coil has a piston with a larger-than-
recommended orifice. This will result in:
- correct answer low head pressure and high suction pressure in the cooling cycle.
A new 3-ton heat pump installation has an undersized return air duct. In the heating mode, the unit will
most likely:
- correct answer go off on high pressure safety.
A technician has just installed a heat pump. It heats satisfactorily, but will not cool. A possible cause of
this problem is the:
- correct answer indoor check valve is stuck open
An electric furnace has four 5-kW elements that are rated at 240V. The available voltage to operate the
furnace is 208V. Which of the following indicates the effect that this will have on the BTUH output of the
2026\2027 A+ Grade
A correct statement regarding the outdoor coil of a heat pump is that damage may result if the:
- correct answer defrost water does not drain from the coil.
A dirty air filter in a heat pump operating in the heating mode could result in:
- correct answer excessive head pressure.
A dirty air filter on a heat pump system will result in:
- correct answer high head pressure in the heat mode and low suction pressure in the cool mode.
A fan delay can add cooling efficiency by:
- correct answer operating the indoor blower after compressor shut-down
A heat pump that uses a piston-type metering device on the indoor coil has a piston with a larger-than-
recommended orifice. This will result in:
- correct answer low head pressure and high suction pressure in the cooling cycle.
A new 3-ton heat pump installation has an undersized return air duct. In the heating mode, the unit will
most likely:
- correct answer go off on high pressure safety.
A technician has just installed a heat pump. It heats satisfactorily, but will not cool. A possible cause of
this problem is the:
- correct answer indoor check valve is stuck open
An electric furnace has four 5-kW elements that are rated at 240V. The available voltage to operate the
furnace is 208V. Which of the following indicates the effect that this will have on the BTUH output of the
