Heat Pump Components
Heat Pump Components
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Question 1 |
What is the purpose of the reversing valve on an air-to-air heat pump?
A | It reverses the direction of the compressor. |
B | It changes the flow of the refrigerant, making the outdoor coil the condenser during the winter months. |
C | It changes the flow of the refrigerant, making the indoor coil the condenser during the winter months. |
D | It changes the flow of the refrigerant, making the indoor coil the condenser during the summer months. |
Question 2 |
On a reversing-valve, what is connected to the single connection side?
A | The compressor discharge line |
B | The compressor suction line |
C | The indoor coil |
D | The outdoor coil |
Question 3 |
On a reversing-valve, what is connected to the center on the 3 connection side?
A | The compressor discharge line |
B | The compressor suction line |
C | The indoor coil |
D | The outdoor coil |
Question 4 |
What pressure differential must be maintained for a reversing-valve to operate properly?
A | 25 psig |
B | 50 psig |
C | 75 psig |
D | 100 psig |
Question 5 |
Where are the check valves located on an air-to-air heat pump?
A | On the outdoor coil |
B | On the indoor coil |
C | On the outdoor coil and indoor coil |
D | On the suction line |
Question 6 |
How are the check valves connected in a heat pump system?
A | On the inlet of the accumulator |
B | In parallel with both metering devices |
C | In series with one metering device and parallel with the other |
D | Both b and c |
Question 7 |
A ball type check valve must 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 8 |
When installing a ball type check valve, what must be done to prevent warping?
A | A heat sink must be used when brazing it into the line |
B | The ball must be removed when brazing it into the line |
C | A brass coupling must be used if connecting it to the liquid line |
D | The valve must be cooled quickly after brazing it into the liquid line |
Question 9 |
Where is the accumulator located on a heat pump?
A | Between the center connection of the reversing valve and the compressor |
B | Between the single connection side of the reversing valve and the compressor |
C | Between the right connection of the reversing valve and the compressor |
D | Between the left connection of the reversing valve and the compressor |
Question 10 |
When would you most likely find liquid in the vapor line on a heat pump?
A | During the cooling mode |
B | During the heating mode |
C | During the beginning of a defrost |
D | During the heat mode after a defrost |
Question 11 |
What component must always be de-energized during the defrost cycle of a heat pump?
A | The reversing valve solenoid |
B | The outdoor fan |
C | The indoor fan |
D | The defrost relay coil |
Question 12 |
Why are the auxiliary strip heaters energized during the defrost cycle?
A | To add an extra heat load to the indoor coil |
B | To increase the pressure of the system for maximum defrost efficiency |
C | To increase supply-air temperature for comfort |
D | The auxiliary strip heaters are not energized during the defrost cycle |
Question 13 |
What position must the reversing valve be in during the defrost cycle?
A | The cooling mode |
B | The heating mode |
C | In the open position |
D | In the closed position |
Question 14 |
When a heat pump switches into the defrost cycle it must
A | Remain in defrost until the temperature rise across the indoor coil reaches 50 degrees. |
B | Remain in defrost until the indoor coil has reached a predetermined temperature. |
C | Remain in defrost until the outdoor coil has reached a predetermined temperature. |
D | Remain in defrost until the indoor thermostat is satisfied. |
Question 15 |
A defrost termination thermostat is commonly located
A | On the vapor line, and opens at 55 degrees |
B | On the liquid line, and closes at 55 degrees |
C | On the indoor coil, and closes at 55 degrees |
D | On the outdoor coil, and opens at 55 degrees |
Question 16 |
What type of system uses a temperature and a pressure sensor to control the defrost cycle?
A | A time-initiation-temperature-termination defrost system |
B | A temperature-initiation-temperature-termination defrost system |
C | A pressure-initiation-temperature-termination defrost system |
D | A pressure-time-initiation-temperature-termination defrost system |
Question 17 |
A pressure switch, used on the defrost cycle of a heat pump, commonly closes at a preset pressure differential of
A | 1” to 2” of WC. |
B | .5” to .65” of WC |
C | .02” to .05” of WC |
D | 2” to 2.45” of WC |
Question 18 |
Temperature split refers to
A | The temperature difference of the air across the outdoor coil |
B | The temperature difference between the indoor and the outdoor of the home |
C | The temperature difference of the air across the indoor coil |
D | The temperature difference between the air entering a coil and the temperature of the coil |
Question 19 |
The outdoor ambient thermostat is commonly used to
A | Energize the first stage of heating in an air to air heat pump |
B | De-energize the compressor during the second stage of heating in an air to air heat pump |
C | Energize the auxiliary strip heaters during the first stage of heating |
D | Energize the auxiliary strip heaters during the second stage of heating |
Question 20 |
A hold-back thermostat is used to
A | Hold-back compressor operation during the defrost cycle |
B | Keep the system energized during a defrost cycle when the room thermostat is satisfied |
C | Prevent the operation of the auxiliary strip heaters during the defrost cycle |
D | Energize the auxiliary strip heaters during the heating cycle |
Question 21 |
A discharge temperature thermostat is used
A | On air-to-air heat pump systems that use electric auxiliary strip heaters |
B | On air-to-air heat pump systems that use fossil fuel |
C | On air-to-air heat pump systems that use auxiliary strip heaters or fossil fuel |
D | On air-to-air heat pump systems to control the defrost sequence |
Question 22 |
When sizing a heat pump, it must initially be sized for the
A | The heating load |
B | The cooling load |
C | The heating and cooling load |
D | The total capacity |
Question 23 |
when sizing for the auxiliary heat for a heat pump system, the auxiliary heat must
A | be capable of handling the entire heat load of the structure minus the heat pump capacity |
B | be capable of handling the entire heat load of the structure |
C | be electric strip heaters only |
D | be fossil fuel only |
Question 24 |
Auxiliary strip heaters are
A | used to defrost the outdoor coil during low ambient conditions |
B | located at the indoor unit upstream from the indoor coil |
C | located at the indoor unit downstream from the indoor coil |
D | wired in parallel with the compressor |
Question 25 |
What controls the auxiliary strip heaters in a heat pump system?
A | The first stage of a two-stage thermostat |
B | The second stage of a two-stage thermostat |
C | The air pressure switch |
D | The auxiliary switch on the contactor |
Question 26 |
What is the purpose of the de-ice coil on an air-to-air heat pump?
A | It prevents the formation of ice on the indoor coil during the cooling cycle |
B | It prevents the formation of ice on the indoor coil during the heating cycle |
C | It prevents the formation of ice on the upper section of the outdoor coil |
D | It prevents the formation of ice on the lower section of the outdoor coil |
Question 27 |
The coefficient of performance (COP) is
A | A heat pump’s rating in the cooling cycle, comparing the heat input by the electrical input. |
B | A heat pump’s rating in the heating cycle comparing the heat input by the electrical output. |
C | A heat pump’s rating in the cooling cycle, comparing the heat output by the electrical output. |
D | A heat pump’s rating in the heating cycle, comparing the heat output by the electrical input. |
Question 28 |
When installing a heat pump system, the unit should always be located as close to the indoor unit as possible because
A | During the cooling cycle a longer liquid line will cause the system to operate less efficiently |
B | During the cooling cycle a longer vapor line will cause the system to operate less efficiently |
C | During the heating cycle a longer liquid line will cause the system to operate less efficiently |
D | During the heating cycle a longer vapor line will cause the system to operate less efficiently |
Question 29 |
When installing an outdoor coil, it must
A | Always be placed under the overhang of the building |
B | Never be placed under the overhang of the building |
C | Have at least 1” of clearance around all sides |
D | Have a maximum distance from the exterior wall of 6” |
Question 30 |
What are common supply-air static pressures for a heat pump duct system?
A | 2” WC |
B | 1” WC |
C | .5” WC |
D | .15” WC |
Question 31 |
What is a common temperature rise over the indoor coil of a heat pump during the heating cycle?
A | 70 degrees |
B | 50 degrees |
C | 35 degrees |
D | 20 degrees |
Question 32 |
When installing an indoor unit , a clearance that is commonly required for service accessibility is
A | 20”
|
B | 16” |
C | 10”
|
D | 6” |
Question 33 |
How much of an air space is required between the supply-air duct of a heat pump and combustible material?
A | 6”
|
B | 4”
|
C | 2”
|
D | 1” |
Question 34 |
What is required on a downflow-type indoor unit used with an air-to-air heat pump?
A | A smaller return-air duct system |
B | A noncombustible floor base |
C | And air pressure switch located in the return-air duct |
D | A 70 degree temperature rise |
Question 35 |
What is required on a horizontal-flow-type indoor unit used with an air-to-air heat pump?
A | A filter rack downstream from the auxiliary heaters |
B | A backward curved blower |
C | An auxiliary drain pan |
D | A de-ice coil |
Question 36 |
How many strands and what size wire are commonly used for the 24-volt control circuit on an air-to-air heat pump?
A | 4 strand 18 gauge |
B | 6 strand 18 gauge |
C | 6 strand 22 gauge |
D | 8 strand 18 gauge |
Question 37 |
On a heat pump thermostat, what connects to the Y1 terminal?
A | The fan relay coil |
B | The auxiliary heaters |
C | The reversing valve |
D | The compressor contactor |
Question 38 |
On a heat pump thermostat, what connects to the O terminal?
A | The fan relay coil |
B | The auxiliary heaters |
C | The reversing valve |
D | The compressor contactor |
Question 39 |
On a heat pump thermostat, what connects to the W2 terminal?
A | The thermostat trouble light |
B | The auxiliary heaters |
C | The reversing valve |
D | The compressor contactor |
Question 40 |
On a heat pump thermostat, what connects to the X terminal?
A | The thermostat trouble light |
B | The auxiliary heaters |
C | The reversing valve |
D | The emergency heat light |
Question 41 |
On a heat pump thermostat, what connects to the E terminal?
A | The thermostat trouble light |
B | The auxiliary heaters |
C | The reversing valve |
D | The emergency heat light |
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