Deck 27: Heat Pumps

Question 1

Which type of geothermal system uses lakes and wells as the water source?

A) closed-loop system
B) open-loop system
C) continuous-loop system
D) series loop system

Answer 1

B

Question 2

Heat pump theory is based on the fact that heat transfers from cold to hot.

Answer 2

False

Question 3

In the heating mode, a heat pump compressor pumps the refrigerant in reverse.

Answer 3

False

Question 4

Where is the accumulator located on a heat pump system?

A) between the evaporator inlet and the evaporator outlet
B) between the evaporator outlet and the reversing valve
C) between the compressor suction and the reversing valve
D) between the compressor discharge and the reversing valve

Question 5

When troubleshooting an air-to-air heat pump, the technician notices that the outdoor fan motor is not operating, but the compressor is operating during a call for heat. What is the most likely problem?

A) defective room thermostat
B) defective defrost fan control
C) defective reversing valve
D) defective outdoor contactor

Question 6

In a heat pump system, the evaporator is described as the __________ coil and the condenser is described as the __________ coil.

Question 7

List four heat pump classifications.

Question 8

A vertically-piped geothermal system uses __________ to __________ feet of piping per ton of refrigeration.

A) 100, 300
B) 200, 400
C) 300, 500
D) 600, 800

Question 9

What is the flow rate per ton of refrigeration for geothermal heat pumps?

A) 3-7 gpm
B) 7-10 gpm
C) 10-15 gpm
D) 15-22 gpm

Question 10

When using a heat pump thermostat, the first stage is always the __________.

A) heat pump
B) electric heating elements
C) fossil fuel system
D) any of the above

Question 11

A heat pump system could have two liquid line driers instead of using a bidirectional drier.

Question 12

Solid-state defrost systems use which type of temperature sensors?

A) sensing bulb
B) bimetal
C) thermistors
D) mercury tubes

Question 13

An air-to-air heat pump system can need to be defrosted when the ambient air temperature is as high as 50 degrees F.

Question 14

Which item is NOT a special heat pump component?

A) bidirectional drier
B) reversing valve
C) check valve
D) condenser

Question 15

Heat pump defrost is necessary in which mode of operation?

A) heating
B) cooling
C) either a or b
D) Defrost is never necessary for a heat pump system.

Question 16

Explain how defrost is accomplished on a heat pump system.

Question 17

When troubleshooting an air-to-air heat pump, the technician notices that warm air is coming out of the indoor coil during a call for cooling. What is the most likely problem?

A) defective room thermostat
B) defective reversing valve
C) defective compressor
D) defective defrost control
E) a or b

Question 18

List the three methods in which defrost can be initiated or terminated on a heat pump system.

Question 19

How many feet of pipe are required for each ton of refrigeration for a horizontally-piped geothermal system?

A) 100 to 300
B) 200 to 400
C) 300 to 500
D) 500 to 700

Question 20

Which type of geothermal heat pump system uses the earth itself as its heat sink?

A) open-loop system
B) closed-loop system
C) continuous-loop system
D) series-loop system

Question 21

List the three types of closed-loop configurations used for geothermal systems.

Question 22

__________ (HSPF) is used to measure heating efficiency. The HSPF is a comparison of the __________ compared to the __________.

Question 23

The __________ (COP) is a measure of the amount of energy output per unit of energy input.

Question 24

If a heat pump had a Btu rating of 36,000 and used 3000 watts of energy to remove the Btus, what would the SEER rating be?

Question 25

What does the acronym SEER stand for when referring to heat pumps?