How does the heating-cycle charge compensator aid the heating cycle?
It makes the gas line cold.
It raises the temperature of the refrigerant.
It stores the unneeded refrigerant.
It fills with hot air.
How is the COP rating different from the HSPF?
HSPF takes data from multiple weather conditions.
Only the HSPF measures heating and cooling units.
Only the COP measures defrost.
COP takes data from multiple weather conditions.
Because air source heat pumps circulate less refrigerant at low ambient temperatures, the refrigerant not being used is stored
In a liquid receiver
In the compressor crankcase
In a suction accumulator or charge compensator
In the metering device
How is heat pump Coefficient of Performance, COP, calculated?
COP is the ratio of heat output divided by heat input measured at one particular condition
COP is a measure of heating BTUs per watt averaged for the entire heating season
COP is a measure of heating BTUs per watt measured at one particular condition
COP is the ratio of heat output divided by heat input averaged for the entire heating season
How is heat pump Heating Seasonal Performance Factor, HSPF, calculated?
HSPF is the ratio of heat output divided by heat input measured at one particular condition.
HSPF is a measure of heating BTUs per watt measured at one particular condition
HSPF is the ratio of heat output divided by heat input averaged for the entire heating season
HSPF is a measure of heating BTUs per watt averaged for the entire heating season
What prevents the refrigerant from flowing through the indoor metering device during the heating cycle?
The outdoor check valve
The heating shutoff valve
The indoor check valve
The reversing valve
Heat pump A has a SEER rating of 16 and an HSPF rating of 7. Heat pump B has a SEER rating of 14 and an HSPF rating of 9. Which heat pump cools more efficiently?
Heat pump A
Heat pump B
They are about the same heating efficiency by the time both the SEER and HSPF are considered
Neither the SEER nor the HSPF can determine which heat pump heats more efficiently
What is the main difference between a heat pump and a fossil fuel furnace?
Fossil fuel furnaces have been around longer.
Fossil fuel furnaces are hotter.
Heat pumps are easier to install.
Heat pumps move heat instead of creating it.
How can an air source heat pump heat when the outdoor temperature is cold?
The friction of the air passing over the outdoor coil raises the temperature
All molecules contain some heat until they reach absolute 0 (-460ºF)
Air source heat pumps only use the outdoor air in the cooling season
All heating is accomplished with electrical resistance heaters, so the air temperature is irrelevant
How can you lower the temperature at which evaporation takes place?
Reduce the pressure on the low side of the system
Raise the pressure on the low side of the pump
Decrease the pressure on the high side of the pump
Add more refrigerant into the pump
Which of the following is the correct order of the flow in the heating cycle of an air source heat pump?
compressor, reversing valve, indoor coil, outdoor TEV, outdoor coil, reversing valve
reversing valve, indoor coil, outdoor coil, outdoor TEV, compressor
Indoor TEV, indoor coil, reversing valve, compressor, reversing valve, outdoor coil
compressor, reversing valve, outdoor coil, indoor TEV, indoor coil, reversing valve
When are most heat pump reversing valves energized?
During both the defrost and cooling cycles
During the cooling cycle
During the defrost cycle
During the heating cycle
What makes the main valve in the reversing valve shift from one side to the other?
A small gear motor that is operated on 24 volts engages gears on the back of the valve core
An electronic stepper motor mounted on one end of the reversing valve
Pressure difference from one side of the valve to the other
A solenoid coil creates a magnetic field that pulls the valve to one end and repels it to the other
Which of the following is responsible for shifting the position of the sliding cylinder?
condensation
pressure
refrigerant
gravity
The heat source for an air source heat pump is
the air inside the house
the air outside the house
the water in the water loop
electric strip heat
How are heat pumps classified?
by their cooling source and cooling sink
by their air intake pump
by their heat source and heat sink
by their refrigerant type
How can a heat pump filter drier be differentiated from a standard filter drier?
By the shiny, polished appearance of the stainless steel core
By the two copper lines on each end of the drier
By the 600 psig pressure rating
By the directional arrows pointing towards both ends of the drier
When is the outdoor metering device bypassed?
The cooling cycle
The heating cycle
Both the cooling and defrost cycles
Both the heating and defrost cycles
When is the indoor metering device bypassed?
Both the heating and cooling cycles
A bi-flow thermostatic expansion valve
can be used with two different refrigerants by selecting the correct flow
can be used for creating two stages of heating or cooling
allows refrigerant flow in both directions
can be used with two different capacity units by selecting the correct flow
Liquid floodback commonly occurs on air source heat pumps
when the defrost cycle is terminated and the cycle reverses
when the heat pump is operated in cooling with a low charge
when the liquid filter drier is stopped up
when the heat pump is operated in heating on a warm day
Heat pump A has a SEER rating of 16 and an HSPF rating of 7. Heat pump B has a SEER rating of 14 and an HSPF rating of 9. Which heat pump heats more efficiently?
