Heat Pump II
Heat Pump II
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Question 1 |
On an air-to-air heat pump, the suction pressure and discharge pressure are low during the cooling months, what are two possible problems
A | A dirty air filter and a dirty condenser |
B | A low charge, and a dirty condenser |
C | A restricted indoor metering device and a dirty air filter |
D | A restricted outdoor metering device and a restricted indoor check valve
|
Question 2 |
On an air-to-air heat pump, the discharge pressure and suction pressure are high during the heating months. What are two possible problems?
A | A restricted indoor metering device and a restricted outdoor check valve |
B | A dirty outdoor coil and a restricted outdoor metering device |
C | A defective defrost system and a dirty outdoor coil |
D | A dirty indoor filter and noncondensables in the system
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Question 3 |
While checking an air-to-air heat pump during the winter, it is found that the outdoor coil has frost buildup and the system is operating on emergency heat. Tech A says that the system might have a defrost problem. Tech B says that the reversing valve might be leaking. Which tech is correct?
A | Tech A |
B | Tech B |
C | Both Techs are correct |
D | Both techs are in-correct
|
Question 4 |
While checking a heat pump in the heating season, it is found that discharge pressure is low and suction pressure is high. What are two possible causes?
A | A restricted outdoor metering device and a defective defrost system |
B | An inefficient compressor and a dirty indoor air filter |
C | An excessive heat load and a dirty condenser |
D | A leaking reversing valve and bad compressor valves
|
Question 5 |
What is the test for checking to see if a reversing valve is leaking internally?
A | A temperature measurement can be taken at the inlet and the outlet of the valve in the heating and cooling mode. |
B | The valve can only be changed because it is impossible to test the valve for internal leaks |
C | A temperature-drop reading across the indoor coil during the cooling season will determine if the reversing valve is leaking |
D | The reversing valve often has a high pitched whistle if it is leaking internally. |
Question 6 |
What component must always be de-energized during the defrost cycle?
A | Reversing valve |
B | Outdoor fan |
C | Indoor fan |
D | Defrost relay coil
|
Question 7 |
When a air-to-air heat pump is operating in the cooling mode, what can cause a decrease in high-side and low-side pressure?
A | Restricted indoor metering device |
B | Defective indoor coil check valve |
C | Bad compressor valves |
D | Defective outdoor metering device
|
Question 8 |
Tech A sys that the check valves in a heat pump are connected in series with both metering devices. Tech B says that they are connected in parallel with both metering devices. Which is correct?
A | Tech A |
B | Tech B |
C | Both Techs are correct |
D | Both Techs are in-correct
|
Question 9 |
When replacing a check valve in a heat pump system it is critical that the valve be installed
A | Horizontally, with the seat on the outlet of the valve |
B | Vertically, with the seat on the bottom of the valve |
C | Horizontally, with the seat on the inlet of the valve |
D | Vertically, with the seat on the top of the valve |
Question 10 |
A Tech replaces a check valve in a heat pump system, without protecting the valve. Upon start up it is found that the new valve is defective, what could have been the problem with the valve?
A | A heat sink was not used and the valve warped |
B | The valve may have been defective from the factory |
C | The problem was misdiagnosed |
D | All of the above |
Question 11 |
Tech A says that the outdoor ambient thermostat commonly de-energizes the compressor during the second stage of heating in an air-to-air heat pump. Tech B says that it energizes the auxiliary heat strips during the first stage of heating
A | Tech A is correct |
B | Tech B is correct |
C | Both are correct |
D | Both are incorrect
|
Question 12 |
If there is malfunction in a hold-back thermostat used with an air-to-air heat pump, how would this affect the system?
A | System would not hold back the compressor operation during the defrost cycle, causing excessive power consumption |
B | System would not stay energized during defrost if the room thermostat is satisfied, causing freezing of the outdoor coil |
C | System would not de-energize the auxiliary strip heaters during the defrost cycle, causing excessive heat build-up |
D | System would not energize the auxiliary strip heaters during the heating cycle, causing insufficient heating
|
Question 13 |
On a service call for an air-to-air heat pump in the heating season, it is noticed the system operates normally until the defrost circuit is energized. System stays in defrost for approximately 15 min when there is no ice or frost buildup on the coil, what is the possible problem?
A | Defrost timer is defective |
B | Defrost termination switch is stuck closed |
C | Defrost termination switch is stuck open |
D | Reversing valve solenoid is stuck open
|
Question 14 |
Customer complaint on a air-to-air heat pump during the heating season is insufficient heat during low ambient conditions. Upon check it is found that the mechanical heat pump is operating properly, but the auxiliary heat is not operating. What circuit should be checked next?
A | First stage heating circuit |
B | Second stage heating circuit |
C | Air pressure control circuit |
D | Auxiliary contactor circuit
|
Question 15 |
While checking a air-to-air heat pump in heating operation the system has a 35 degree temperature rise across the coil, he decides that
A | The indoor air filter might be dirty |
B | The indoor blower is running too fast |
C | The outdoor coil might be dirty |
D | Temperature rise is sufficient |
Question 16 |
What are the symptoms of an air-to-air heat pump that has a low charge when in the cooling mode?
A | The indoor coil will be partially frosted and the discharge pressure will increase |
B | The suction line will sweat and the low-side pressure will decrease |
C | The low-side pressure will decrease and the indoor coil will be partially frosted |
D | The discharge pressure will decrease and the suction pressure will increase.
|
Question 17 |
On a cooling call for an air-to-air heat pump it is noted that the vapor line and the compressor have frost build-up. Tech A thinks that the problem is probably a low charge. Tech B thinks that it could be a dirty air filter. Which is most likely correct?
A | Tech A |
B | Tech B |
C | Both are correct |
D | Both are in-correct
|
Question 18 |
What are two symptoms of an overcharged air-to-air heat pump with a dirty outdoor coil?
A | Subcooling decreases and amperage increases |
B | Superheat increases and discharge pressure increases |
C | Suction pressure increases and subcooling increases |
D | Discharge pressure increases and amperage increases |
Question 19 |
What is the effect on superheat and subcooling, on an undercharged air-to-air heat pump?
A | Superheat increases and subcooling increases |
B | Superheat increases and subcooling decreases |
C | Superheat decreases and subcooling increases |
D | Superheat decreases and subcooling decreases |
Question 20 |
Operating a heat pump in the heating mode with a dirty air filter would cause?
A | Very low suction side pressure |
B | Iced-up indoor coil |
C | Excessive head pressure |
D | Low head pressure
|
Question 21 |
The best method to charge a heat pump during winter is
A | Weigh in the exact charge |
B | Subcooling method |
C | Superheat method |
D | Ambient method
|
Question 22 |
Upon installation a heat pump will heat, but not cool. The likely cause is
A | Outdoor metering device is not metering |
B | Indoor check valve is open |
C | Indoor check valve is closed |
D | Outdoor check valve is not closing
|
Question 23 |
On a service call in the cooling mode it is noted that the compressor is running but not the outdoor fan is not, both fan and capacitor check to be good. The tech concludes
A | Compressor contactor is defective |
B | Reversing valve is defective |
C | Defrost control is defective |
D | Defrost relay is defective
|
Question 24 |
If the reversing valve was sticking in the midway position, your gauges would show
A | Higher than normal high-side pressure and higher than normal low side pressure |
B | Lower than normal high side pressure and higher than normal low side pressure |
C | Lower than normal high side pressure and lower than normal low side pressure |
D | Both high and low side pressures will be higher than normal
|
Question 25 |
A strip furnace has four 5 kw elements rated at 240v. the voltage that the furnace will operate will be 208 v. What will be the effect on the furnace Btu output?
A | It will reduce the output |
B | It will increase the output |
C | If the elements are wired in series there will be no reduction in output |
D | There will be an increase in output if the elements are wired in series
|
Question 26 |
With a heat pump operating in the cooling mode, the indoor check valve is
A | Wide open |
B | Modulating |
C | In mid position |
D | Closed
|
Question 27 |
A strip furnace using a single stage thermostat is recording a low temperature rise. To correct this
A | Reduce the volume of air through the furnace |
B | Increase the volume of air through the furnace |
C | Change the air filter |
D | Install a two stage thermostat
|
Question 28 |
The difference of the ON heating cycles between fossil fuel and a heat pump is that the heat pump cycle will be
A | There is no difference |
B | Shorter |
C | Longer |
D | Very short
|
Question 29 |
After charging a heat pump the compressor does not start but instead hums then the internal overload opens. The system has a hard start kit. The most common problem would be
A | Overcharged system |
B | Undercharged system |
C | Defective compressor |
D | Defective potential relay
|
Question 30 |
The thermostat second stage heating contacts of an all electric heat pump system serve to
A | Shut down the compressor and condenser fan motor |
B | Turn on the defrost heaters |
C | Shut down the compressor |
D | Turn on the auxiliary heaters and the compressor
|
Question 31 |
A reading of high suction pressure during the heating mode could likely be
A | Leaking reversing valve |
B | Leaking indoor check valve |
C | Loose bulb at the TXV location |
D | Low refrigerant charge |
Question 32 |
Taking temperature measurements at the four pipe connections of the reversing valve may indicate
A | Reversing valve leakage |
B | Overcharged system |
C | Undercharged system |
D | Indoor check valve leaking
|
Question 33 |
A heat pump application that is using an oversized piston orifice metering device will result in
A | High head pressure and low suction pressure in the cooling mode |
B | High head pressure and high suction pressure in the cooling mode |
C | Low head pressure and low suction pressure in the heating mode |
D | Low head pressure and high suction pressure in the cooling cycle
|
Question 34 |
When speaking to a customer of a heat pump installation you should also inform him that to conserve electricity he should
A | Replace air filters often |
B | Install a night set back thermostat |
C | Close off dampers to rooms not used |
D | Install ceiling fans
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Question 35 |
In order to add cooling efficiency, a fan delay may be used to
A | Turn on the indoor fan motor after the compressor is off |
B | Start the outdoor fan motor after the compressor turns on |
C | Start the indoor motor after compressor start up |
D | Turn on the condenser fan motor and the indoor fan motor before the compressor
|
Question 36 |
A 12 X 8 return duct has been installed on a 3 ton heat pump system. What will be the most likely result when operating in the heating mode?
A | Operate satisfactorily |
B | Overheat the premises |
C | Under heat the premises |
D | Shutdown on high pressure control
|
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