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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); - ANSWER ✔✔C: reversing valve.
2. What is the difference between "demand defrost" and "timed defrost?"
- ANSWER ✔✔D: 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; - ANSWER ✔✔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; - ANSWER ✔✔A: initial balance point.
5. At what temperature is an outdoor ambient thermostat normally set? -
ANSWER ✔✔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: - ANSWER ✔✔D: outdoor fan is inoperative
7. In order to determine a heat pumps' balance point, you must first
calculate; - ANSWER ✔✔A: the building's heat load.
8. Heat pumps are sized to handle the; - ANSWER ✔✔A: cooling
load.
9. a high efficiency heat pump system designed to function from high or
low ambient conditions below 10F may have; - ANSWER ✔✔C:
auxiliary heat exchanger injected with a ethylene glycol solution.
10. Room thermostats for heat pumps should be installed; -
ANSWER ✔✔B: 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; - ANSWER ✔✔B:
emergency heat mode.
12. Start-up with a night set back digital thermostat requires the
technician to always; - ANSWER ✔✔D: teach the customer to
program the thermostat.
13. The heat pump defrost board can be manipulated by the technician
to; - ANSWER ✔✔C: simulate the defrost cycle.
14. The air-to-air heat pump outdoor unit is most efficient if located; -
ANSWER ✔✔C: in a moderate climate zone.
15. Which of the following are innovations that may be found on new
high efficiency units? - ANSWER ✔✔D. ECM motors
16. How may a lockout (impedance) relay be reset? - ANSWER
✔✔C: Simply disconnect power to the unit momentarily.
17. The temperature difference between the 1t and 2od bulbs for heating
on a heat pump thermostat is; - ANSWER ✔✔C: approximately 2°F
18. SEER calculated by: - ANSWER ✔✔B. BTUs removed by the
watts consumed during the cooling season
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