Unit 43 #3

System overshoot and temperature swing are controlled by a device known as a(n)

• anticipator.

• regulator.

• moderator.

• Capillary tube

The term "balance point" is best described as

• the lowest temperature at which a heat pump system can heat a structure without the aid of any supplementary heat.

• the lowest temperature at which a heat pump's electric strip heaters can heat a structure.

• the point where the heating and cooling capacities of a heat pump system are equal to each other.

• the point where the heat pump's supplementary heating capacity exactly offsets the system's cooling capacity.

In the emergency heat mode, what percentage of the heat pump system's electric strip heaters will be energized?

• 50%

• 100%

• 75%

• 25%

Which of the following statements is true regarding SEER and HSPF?

• SEER is an efficiency rating for cooling, while HSPF is an efficiency rating for heating.

• SEER is an efficiency rating for heating, while HSPF is an efficiency rating for cooling.

• Both SEER and HSPF are efficiency ratings for cooling.

• Both SEER and HSPF are efficiency ratings for heating.

Which of the following is true regarding package-type heat pump systems?

• They are charged at the factory and bench-tested before they are shipped.

• They are shipped with a holding charge of dry nitrogen.

• All field-installed refrigerant lines must be insulated.

• Only the larger of the two field-installed refrigerant lines must be insulated.

Which of the following best describes the operation of second-stage heat on a heat pump system?

• Last on, last off

• First on, last off

• First on, first off

• Last on, first off

Which of the following statements is true regarding the cooling cycle of a heat pump system?

• The compressor cycles on when the thermostat's selector switch is set to the cooling mode and the reversing valve's coil energizes and deenergizes depending on the space temperature.

• The coil on the reversing valve is energized when the thermostat's selector switch is set to the cooling mode and the compressor cycles on and off depending on the space temperature.

• Both the compressor and the reversing valve's coil are energized when the thermostat's selector switch is set to the cooling mode and the reversing valve's coil energizes and deenergizes depending on the space temperature.

• Neither the compressor nor the reversing valve's coil are energized when the thermostat's selector switch is set to the cooling mode, but they are both energized and deenergized depending on the space temperature.

Why is defrost required on some heat pump systems?

• The outside ambient air is warmer than the condenser coil.

• The evaporator coil is warmer than the air in the occupied space.

• The evaporator coil is colder than the outside ambient air.

• The outside ambient air is colder than the evaporator coil.

During the defrost cycle of an air-to-air heat pump system

• the reversing valve coil is energized and the compressor cycles off.

• the reversing valve coil is deenergized and the compressor cycles off.

• the reversing valve coil is energized and the outdoor fan cycles off.

• the reversing valve coil is deenergized and the outdoor fan cycles off.

How can a system be easily identified as a heat pump by simply looking at the thermostat?

• Heat pump thermostats have an emergency heat setting.

• Heat pump thermostats have a FAN-ON, FAN-AUTO feature.

• Heat pump thermostats have an automatic changeover feature.

• Heat pump thermostats have both heating and cooling settings.