Esco Heat pump exam

Esco Heat pump exam 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); - correct answersC: reversing valve. 2. What is the difference between "demand defrost" and "timed defrost?" - correct answersD: demand defrost only happens when needed, and time defrost is on timed temperature 3. The thermostat that controls the auxiliary electric heat according to the outdoor temperature is called the; - correct answersC: 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; - correct answersA: initial balance point. 5. At what temperature is an outdoor ambient thermostat normally set? - correct answersB: 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: - correct answersD: outdoor fan is inoperative 7. In order to determine a heat pumps' balance point, you must first calculate; - correct answersA: the building's heat load. 8. Heat pumps are sized to handle the; - correct answersA: cooling load. 9. a high efficiency heat pump system designed to function from high or low ambient conditions below 10F may have; - correct answersC: auxiliary heat exchanger injected with a ethylene glycol solution. 10. Room thermostats for heat pumps should be installed; - correct answersB: as near to the main return air grill as possible. 11. When the heat pump compressor has malfunetioned, the cus tomer has the option to switch the system into; - correct answersB: emergency heat mode. 12. Start-up with a night set back digital thermostat requires the technician to always; - correct answersD: teach the customer to program the thermostat. 13. The heat pump defrost board can be manipulated by the technician to; - correct answersC: simulate the defrost cycle