NATE ICE Heat Pump
A correct statement regarding the outdoor coil of a heat pump is that damage may result
if the: - ANS-defrost water does not drain from the coil.
A dirty air filter in a heat pump operating in the heating mode could result in: -
ANS-excessive head pressure.
A dirty air filter on a heat pump system will result in: - ANS-high head pressure in the
heat mode and low suction pressure in the cool mode.
A fan delay can add cooling efficiency by: - ANS-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: - ANS-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: - ANS-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: - ANS-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 furnace? - ANS-it 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? - ANS-reduce 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: - ANS-electric heating units.
A correct statement regarding the outdoor coil of a heat pump is that damage may result
if the: - ANS-defrost water does not drain from the coil.
A dirty air filter in a heat pump operating in the heating mode could result in: -
ANS-excessive head pressure.
A dirty air filter on a heat pump system will result in: - ANS-high head pressure in the
heat mode and low suction pressure in the cool mode.
A fan delay can add cooling efficiency by: - ANS-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: - ANS-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: - ANS-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: - ANS-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 furnace? - ANS-it 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? - ANS-reduce 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: - ANS-electric heating units.
