NATE ICE Heat Pump
A correct statement regarding the outdoor coil of a heat pump is that damage may result if the: -
ANSdefrost water does not drain from the coil.
A dirty air filter in a heat pump operating in the heating mode could result in: - ANSexcessive
head pressure.
A dirty air filter on a heat pump system will result in: - ANShigh head pressure in the heat mode
and low suction pressure in the cool mode.
A fan delay can add cooling efficiency by: - ANSoperating 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: - ANSlow 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: - ANSgo 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: - ANSindoor 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 furnace? - ANSit will reduce the BTUH output of the furnace.
An electric furnace is controlled by a single-stage thermostat. On a call for heat, all connected
circuits function properly; however, the heat rise across the furnace is much lower than design
requirement. Which one of the following actions should the technician take to correct this
problem? - ANSreduce the air volume through the furnace
Coefficient of Performance (COP) is used primarily in the heating/cooling field to compare
heat-pump efficiencies to those of: - ANSelectric heating units.
During the initial startup of a heat pump with a long line set, which of the following is the most
accurate method to charge the system? - ANSput the unit into the cooling mode and charge it
by the superheat method
If the reversing valve were to stick in the halfway position, which one of the following would
service gauges indicate? - ANSlow discharge pressure and high suction pressure
A correct statement regarding the outdoor coil of a heat pump is that damage may result if the: -
ANSdefrost water does not drain from the coil.
A dirty air filter in a heat pump operating in the heating mode could result in: - ANSexcessive
head pressure.
A dirty air filter on a heat pump system will result in: - ANShigh head pressure in the heat mode
and low suction pressure in the cool mode.
A fan delay can add cooling efficiency by: - ANSoperating 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: - ANSlow 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: - ANSgo 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: - ANSindoor 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 furnace? - ANSit will reduce the BTUH output of the furnace.
An electric furnace is controlled by a single-stage thermostat. On a call for heat, all connected
circuits function properly; however, the heat rise across the furnace is much lower than design
requirement. Which one of the following actions should the technician take to correct this
problem? - ANSreduce the air volume through the furnace
Coefficient of Performance (COP) is used primarily in the heating/cooling field to compare
heat-pump efficiencies to those of: - ANSelectric heating units.
During the initial startup of a heat pump with a long line set, which of the following is the most
accurate method to charge the system? - ANSput the unit into the cooling mode and charge it
by the superheat method
If the reversing valve were to stick in the halfway position, which one of the following would
service gauges indicate? - ANSlow discharge pressure and high suction pressure
