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There is also a filter in the refrigeration system, also referred to as a drier, which acts like a strainer to remove dirt and undesired particles from the system. A device that facilitates the combustion of fuel and air to create heat and then circulates it through the home by means of a fan. This strip works as a safety, or circuit protector, and breaks, or melts, in the event of excess electrical charge, breaking the electrical circuit. Heat flows naturally from a warmer to a cooler material or space.

An example is the latent heat of evaporation which creates a phase transition from liquid to a vapor at a specified temperature and pressure.

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NOTE: Installation of unmatched systems is strongly discouraged. NATE's website can be found at www.

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The quantity and size of particulates emitted by cars, power and industrial plants, wood stoves, etc are regulated by the U. Environmental Protection Agency. One function of the plenum is to manage and equalize pressure for more even distribution. Since atmospheric pressure at sea level is around This fluid boils at a very low temperature enabling it to exude and absorb heat.

This translates to more efficient operation, higher tolerance to liquid refrigerant, less mechanical failure and smoother, quieter operation. An example is the latent heat of evaporation which creates a phase transition from liquid to a vapor at a specified temperature and pressure. LonTalk is a protocol optimized for control created by Echelon Corporation for networking devices over media such as twisted pair, powerlines, fiber optics, and RF. It is popular for the automation of various functions in industrial control, home automation, transportation, and buildings systems such as lighting and HVAC.

If replacing a condensing unit, furnace or air handler, the system must be manufacturer approved and Air Conditioning, Heating and Refrigeration Institute AHRI matched.

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NOTE: Installation of unmatched systems is strongly discouraged. In HVAC a system designed to increase ventilation within a crawlspace, achieve higher air pressure in the crawlspace relative to air pressure in the soil beneath the crawlspace, or achieve lower air pressure in the crawlspace relative to air pressure in the living spaces, by use of a fan. Numbered from 1 to 16, this measurement gives the efficiency value of an air filter. Every air filter has holes that allow air and particles to pass through. The smaller the holes, the fewer particles that can pass through.

Higher MERV ratings indicate smaller holes, and therefore a more efficient filter. Airborne particles — such as dust, dander, mold and viruses — are measured in microns. A conduit, which houses the power cable, refrigerant tubing, suction tubing, and a condensate drain, links the outdoor and indoor units. It is a ductless system which supplies air though indoor unit. In HVAC the movement of outdoor air into a space through intentionally provided openings, such as windows and doors, or through non-powered ventilators or by infiltration. Condition that exists when less air is supplied to a space than is exhausted from the space, so the air pressure within that space is less than that in surrounding areas.

Under this condition, if an opening exists, air will flow from surrounding areas into the negatively pressurized space.


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A network is a collection of computers or devices connected to each other. The network allows these computers or devices to communicate with each other and share resources and information. An off-grid or off-the-grid system is an electricity-generating system that operates independently from the utility grid, providing all of the electricity needed in the home, and is generally more expensive than grid-tied system ideal for buildings located in remote areas without utility service, or where installing power lines would be extremely costly.

An oil furnace is the part of an HVAC system that converts heating oil similar to diesel into high-temperate heat for the home. A set of connectivity standards for industrial automation from the OPC Foundation.

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Chemicals that contain carbon. Volatile organic compounds vaporize at room temperature and pressure. They are found in many indoor sources, including many common household products and building materials. Air taken from the external atmosphere and, therefore, not previously circulated through the system.

HVAC term for air brought into a building from the outdoors often through the ventilation system that has not been previously circulated through the system. This smaller heating or cooling unit is used for residential purposes and is usually located on the roof or in the attic of a house. It can be moved without disconnecting any refrigerant lines. Particles are tiny substances measuring less than microns in diameter.

Indoor air can be filled with particles, some of which can be seen with the naked eye, such as dust and dirt. Others can only be seen with a microscope, such as bacteria and viruses, which typically measure only one micron or smaller in diameter. A state of matter in which solid or liquid substances exist in the form of aggregated molecules or particles.


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Airborne particulate matter is typically in the size range of 0. Fine liquid or solid particles such as dust, smoke, mist, fumes, and fog found in air and emissions. Condition that exists when more air is supplied to a space than is exhausted, so the air pressure within that space is greater than that in surrounding areas.

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Under this condition, if an opening exists, air will flow from the positively pressurized space into surrounding areas. In flowing air, the total pressure minus velocity pressure. The portion of the pressure that pushes equally in all directions.

Or, Preventative Maintenance Regular and systematic inspection, cleaning, and replacement of worn parts, materials, and systems. Preventive maintenance helps to prevent parts, material, and systems failure by ensuring that parts, materials and systems are in good working order. A hydrocarbon gas, C3H8, occurring in crude oil, natural gas, and refinery cracking gas.

It is used as a fuel, a solvent, and a refrigerant. Propane liquefies under pressure and is the major component of liquefied petroleum gas LPG. Two quantities are said to be proportional if they vary in such a way that one of the quantities is a constant multiple of the other, or equivalently if they have a constant ratio. Proportion also refers to the equality of two ratios. The change in input required to produce a full range of change in the output due to the proportional control action. A proportional—integral—derivative controller PID controller is a generic control loop feedback mechanism controller widely used in industrial control systems.

A PID controller attempts to correct the error between a measured process variable and a desired setpoint by calculating and then outputting a corrective action that can adjust the process accordingly and rapidly, to keep the error minimal. A communications protocol is the set of standard rules for data representation, signaling, authentication and error detection required to send information over a communications channel.

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A pound per square inch is a unit of pressure resulting from the force of one pound-force applied to an area of one square inch. Pounds per square inch, absolute is used to clarify that the pressure is relative to a vacuum rather than the ambient atmospheric pressure. Since atmospheric pressure at sea level is around The old standard for residential air conditioners, now being phased out by the U. Lennox offers dry-charged units for those who still have R compatible systems. A chlorine-free refrigerant that meets the U.

In HVAC a thin, reflective foil sheet that exhibits low radiant energy transmission and under certain conditions can block radiant heat transfer; installed in attics to reduce heat flow through a roof assembly into the living space. Ceiling panels that contain electric resistance heating elements embedded within them to provide radiant heat to a room. A type of radiant heating system where the building floor contains channels or tubes through which hot fluids such as air or water are circulated.

The whole floor is evenly heated.