__________ gas has been forming along with oil from dead plants and animals for millions of years.
Heat transfer from one place to another using a fluid.
The larger line in an air-to-air split-system heat pump is known as the ____ line.
Heat energy absorbed or rejected when a substance is changing state and there is no change in temperature.
The removal of heat from a place where it is not wanted and depositing it in a place where it makes little or no difference
The lowest outside air temperature at which the heat pump system can satisfy the heating needs of the structure without requiring auxiliary heat is called the ________ point.
A refrigerant _______ bottle is used to remove the refrigerant from an air conditioning unit during repairs.
The component used to switch the heat pump unit between the heating and cooling modes of operation is the ____ valve.
The smaller line in an air-to-air split-system heat pump is known as the ____ line.
A ________ compressor refers to a compressor and motor sealed by being welded in a container.
The temperature of a liquid when it is cooled below its condensing temperature.
A small, precise opening (hole) through which fluid flows.
A temperature of refrigerant vapor above its saturation temperature.
Most heat pump systems are designed to operate in the heating mode when the solenoid is not energized. This is referred to as “____________________ in the heating mode”.
An instrument used to check low pressure vapors, against a column of mercury or water.
Down
The coil that serves the inside of the house in a heat pump is known as the ______ coil.
_______ feet per minute (CFM)
________ is a good insulator of electricity.
A _______ refrigeration or air conditioning system where the condensing unit remote from the evaporator coil.
A ________ is rated in volt-amperes (VA).
_________ per square inch (PSI)
The _________ percentage for a residential air-conditioning design is 50%.
A _______ switch is designed to stop a piece of equipment before it does damage to itself.
The _________ pumps refrigerant in an air conditioning unit.
A thermostatic ________ valve (TXV) is used in refrigeration systems to control the amount of superheat in the evaporator by metering the amount of refrigerant that enters the evaporator.
_________ is used to pressurize a repaired air conditioning unit to test for leaks.
A __________ air conditioning unit has all components in one unit.
Refrigerant _______ at a high temperature.
The coils of the evaporator and condenser have fins made of _______ to increase heat transfer.
Refrigerant boils at a ______ temperature.
An electrical storage device used to start motors and to improve the running efficiency of motors.
The _______ pressure switch in a refrigeration system shuts the system down when the pressure is too high.
Heat that causes a change in temperature.
The duct that carries the products of combustion out of a structure.
The evaporator coil in an air conditioning system operates at a about _____ degrees.
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