Name: 
 

Chapter 18



True/False
Indicate whether the sentence or statement is true or false.
 

 1. 

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

 2. 

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

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 3. 

When using a heat pump thermostat, the first stage is always the ____.
a.
heat pump
c.
fossil fuel system
b.
electric heating elements
d.
any of the above
 

 4. 

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
 

 5. 

What is the flow rate per ton of refrigeration for geothermal heat pumps?
a.
3-7 gpm
c.
10-15 gpm
b.
7-10 gpm
d.
15-22 gpm
 

 6. 

A vertically-piped geothermal system uses ____ to ____ feet of piping per ton of refrigeration.
a.
100, 300
c.
300, 500
b.
200, 400
d.
600, 800
 

 7. 

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 would be the most likely problem?
a.
defective room thermostat
c.
defective reversing valve
b.
defective defrost fan control
d.
defective outdoor contactor
 

Completion
Complete each sentence or statement.
 

 8. 

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

 

Short Answer
 

 9. 

Explain how defrost is accomplished on a heat pump system.
 

 10. 

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



 
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