Heat Pump Exam with Right Solutions

1. An air-to-air heat pump has many of the same components as an air conditioning system. The major difference is that a heat pump also has a (an); - C: reversing valve. 2. What is the difference between "demand defrost" and "timed defrost?" - D: Demand defrost happens only when needed and timed defrost is based on time whether it is needed or not. 3. The thermostat that controls the auxiliary electric heat according to the outdoor temperature is called the; - C: outdoor ambient thermostat. 4. The outdoor temperature at which the heat pump provides the same amount of heat as the heat loss of the conditioned space without auxiliary heat is known as the; - A: initial balance point. 5. At what temperature is an outdoor ambient thermostat normally set? - B: At or slightly above the initial balance point. 6. The outdoor coil is frozen solid on a "no heat" service call. The most likely reason is: - D: none of the above. 7. In order to determine a heat pumps' balance point, you must first calculate; - A: the building's heat load. 8. Heat pumps are sized to handle the; - A: cooling load. 9. On a heat pump, which coil is considered the evaporar? - D: Depends on the mode of operation. 10. Room thermostats for heat pumps should be installed; - B: as near to the main return air grill as possible. 11. When the heat pump compressor has malfunctioned, the customer has the option to switch the system into; - B: emergency heat mode. 12. Start-up with a night set back digital thermostat requires the technician to always; - B: teach the customer to program the thermostat. 13. The heat pump defrost board can be manipulated by the technician to; - C: simulate the defrost cycle. 14. The air-to-air heat pump outdoor unit is most efficient if located; - C: in a moderate climate zone.