Heat Pump Troubleshooting
Heat Pump Troubleshooting
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Question 1 |
If the compressor will not operate in the cooling mode, the best thing to do is _____.
A | check to see if the compressor runs in the heating or defrost mode |
B | immediately replace the compressor |
C | make sure the compressor is getting voltage |
D | check the refrigerant charge |
Question 2 |
Which of the following conditions is likely to exist in the defrost mode?
A | The outdoor fan motor is on and the auxiliary heater is off. |
B | The indoor and outdoor fan motors are both off. |
C | The outdoor fan motor is on and the auxiliary electric heater is on. |
D | The outdoor fan motor is off and the auxiliary heater is on. |
Question 3 |
If a heat pump operates normally in the reverse cycle heating mode, but does not run in the cooling
mode, a likely cause is the _____.
A | compressor |
B | compressor contactor |
C | reversing valve |
D | circuit breaker |
Question 4 |
If you wanted to determine if the thermostat is sending a signal to the reversing valve, which
terminal would you check for voltage?
A | O |
B | Y |
C | R |
D | W |
Question 5 |
If a heat pump system shows low suction pressure and high superheat during cooling operation,
but operates normally in the heating mode, a likely cause is _____.
A | the reversing valve solenoid is defective |
B | it is too cold outside |
C | the outdoor check valve is stuck open |
D | the outdoor check valve is stuck closed |
Question 6 |
If a heat pump works in the cooling mode, but the reversing valve does not switch over when there
is a call for defrost, a likely cause is a defective _____.
A | reversing valve |
B | compressor contactor |
C | defrost control |
D | compressor |
Question 7 |
If the outdoor fan of a heat pump operates normally in the reverse cycle heating mode, but does not
shut off during defrost, a likely cause is a defective _____.
A | defrost relay |
B | fan motor |
C | thermostat |
D | reversing valve |
Question 8 |
In which of the following modes would you expect to find hot, high-pressure refrigerant flowing
through the outdoor coil?
A | Cooling and defrost |
B | Heating only |
C | Cooling only |
D | Heating and defrost |
Question 9 |
If all stages of the auxiliary electric heaters of a heat pump fail to operate on demand in both the
heating and defrost modes, but all other functions work normally, a likely cause is a _____.
A | defective thermostat |
B | blown fuse |
C | defective defrost relay |
D | defective heat relay |
Question 10 |
In the heating mode, the reversing valve will normally be _____.
A | back seated |
B | front seated |
C | energized |
D | de-energized |
Question 11 |
When the emergency heat feature of a heat pump thermostat is turned on, the usual effect on the
heat pump is _____.
A | the electric heaters operate only if the compressor is unable to handle the heating load |
B | both the compressor and the electric heaters operate regardless of the load |
C | the blower is disabled |
D | only the electric heaters and blower operate |
Question 12 |
A ground source heat pump is one in which the _____.
A | heat source is well water |
B | heat is extracted from the earth by a coil buried in the ground |
C | outdoor coil sits directly on the ground, rather than on a pad or stand |
D | heat sink is well water |
Question 13 |
Refrigerant temperatures and pressures in the cooling mode of a heat pump are _____.
A | about the same in both the suction side and the discharge side of the system |
B | very different from those in the heating mode |
C | about the same as they are in the heating mode |
D | very different from those in a comparable cooling-only unit |
Question 14 |
Each of the following occurs in the reverse cycle heating mode of a heat pump, except _____.
A | refrigerant flows through the outdoor TXV |
B | the reversing valve is de-energized |
C | the outdoor TXV check valve is open |
D | hot, high-pressure refrigerant flows through the indoor coil |
Question 15 |
If relays and contactors are chattering, a possible cause is _____.
A | the supply voltage is too low |
B | the supply voltage is too high |
C | the unit is drawing too much current |
D | they are cold |
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