Trade Terms
Define Noxious
Harmful to health; potentially poisonous or fatal.
What is the role of an expansion device or metering device in an HVAC system?
A device that provides the pressure drop to reduce high-pressure liquid refrigerant to a lower pressure and significantly reducing the temperature at which it boils. Also known as a metering device.
What chemicals make up CFC refrigerants?
A compound used as the basis for a class of refrigerants that contain chlorine, fluorine, and carbon.
At what age can you start an apprenticeship program?
18, in some cases 16 or 17 year olds can get approval to join an apprenticeship program.
The growth of bacteria and other harmful organisms can be reduced or eliminated by _____.
ultraviolet (UV) light
Define Infiltration
The undesirable and uncontrolled movement of air into a building through cracks and crevices.
What is the compressors roll in an HVAC system?
In a refrigerant circuit, the mechanical device that converts low-pressure,
low-temperature refrigerant vapor into a high-temperature, high-pressure refrigerant vapor.
What chemicals make up HCFC refrigerants?
A compound used as the basis for a class of refrigerants that contain hydrogen, chlorine, fluorine, and carbon.
Working in your employer’s best interests as they provide steady employment and promote deserving workers is an example of _____.
loyalty
The Office of Apprenticeship administers apprenticeship training at the federal level and works closely with _____.
state apprenticeship councils
Hydronic
Describes a system that uses water as a heat transfer medium.
What is the role of the evaporator coil in an HVAC system?
A heat exchanger that transfers heat from the air or liquid flowing over it to the cooler refrigerant flowing through it, typically causing the refrigerant to vaporize.
What does it mean to Recover refrigerant?
To remove refrigerant from a system and temporarily store it in containers approved for that purpose.
Product testing technicians are most likely to be employed by _____.
equipment manufacturers
To be resold to other customers, a refrigerant must have been _____
Reclaimed
Define Mechanical Refrigeration Cycle
A process that depends on machinery and phase-changing, heat-transfer mediums (refrigerants) to provide a cooling effect, typically using the refrigerant to absorb heat from one location and transfer it to another. May also be referred to as the vapor compression cycle.
What is the role of the condenser in an HVAC system?
A heat exchanger that transfers heat from a refrigerant to air or water flowing over it, enabling the change of state from a vapor to a liquid.
What does it mean to Recycle refrigerant?
To circulate recovered refrigerant through filtering devices in the shop or field that remove moisture, acid, and other contaminants.
How many classroom hours are required for an apprentice each year?
144
In a typical mechanical refrigeration system, heat is transferred from the indoor air to the refrigerant at the _____.
Evaporator
Define Ultraviolet (UV) light
A form of electromagnetic radiation naturally generated by the sun that has a shorter wavelength than visible light. UV light can also be generated artificially and used to destroy bacteria, viruses, and similar contaminants
List 4 main components in the mechanical refrigeration cycle.
Compressor, Metering device, Evaporator and condenser.
What does it mean to Reclaim refrigerant?
To circulate recovered refrigerant through filtering devices in the shop or field that remove moisture, acid, and other contaminants.
How many on the job hours are required each year for an apprentice.?
2000
Releasing refrigerants to the atmosphere is _____.
prohibited by federal law