LUTRON 653 Right Thermostat Control Datasheet
Application Note #653
Glossary of Key Terms
Air Conditioner
A system using refrigerant to cool the air in the living space. The refrigerant gets evaporated within a coil inside the house.
Hot air from the space passes over this coil and the refrigerant absorbs the heat and is piped to a condenser unit which
is typically outside the house. The heat is released outside and the refrigerant is recycled and sent back into the house for
further heat extraction.
Air Handler
A device which takes the cooled or heated air and moves it throughout the building via the duct work.
Auxiliary Heat
Heat pump systems can be run in reverse to provide heat but the heat provided may not have enough BTUs to heat the
residence during the coldest days of the year in certain geographical areas. Heat pumps are often supplemented by another
heat source, an auxiliary heat source, which is commonly electric. As the temperature falls, even with the heat mode of the
heat pump triggered, the auxiliary heat is also triggered to adequately heat the living space. Both the heat pump and the
auxiliary heat are working at the same time.
Changeover/Reversing Valve
The connection utilized to switch a heat pump system from heat to cool mode, reversing the flow of refrigerant in the
system. The connection is either designated with an “O” for cool or “B” for heat.
Emergency Heat or Auxiliary Only Mode
This is a feature found in heat pump systems. It is used when the heat pump equipment is inoperative. It can be manually
triggered to turn on a supplemental heat source, typically electric, to provide heat for the house until the heat pump is
operating again. This is different from auxiliary heat in that only one heating method is running at a time.
Furnace
A device which generates heat for the living space and distributes the heat via air or water. Some systems utilize electric
elements which become hot as current passes through them. Hot air is then passed over the elements, transferring the heat
to the air, and distributed to the rest of the house. Other systems utilize fossil fuels which are combusted and are used to
heat water or heat air in a heat exchanger and the air or water is then distributed throughout the living space.
Geothermal or Ground Source Heat Pump
A system which utilizes the Earth as a source of heat (for heating) or as a heat sink (for cooling). This type of system is often
referred to as a ground source heat pump because geothermal often implies the harvesting of heat from the Earth which is
not the case. These heat pumps harvest the energy from the sun that is absorbed by the surface of the Earth.
Heat Pump
A system which uses a refrigerant to both cool and heat the air in the living space. In cool mode, the refrigerant gets
evaporated within a coil that is inside the house. Hot air from the space passes over this coil and the refrigerant absorbs the
heat and is piped to a condenser which is outside of the house. The heat is released outside and the refrigerant is recycled
and sent back into the house for further heat extraction.
In heat mode, the process is run in reverse. Refrigerant gets evaporated outside of the house. Hot air passes over the
outside unit and the refrigerant absorbs the heat and is piped to a condenser unit which is inside of the house. The heat is
released inside and the refrigerant is recycled and sent back outside of the house for further heat absorption.
The switching between modes is performed using the changeover/reversing valve connection.
Continued on next page...
10
Customer Assistance — 1.844.LUTRON1
| General | Details |
|---|---|
| Name | LUTRON 653 Right Thermostat Control Datasheet |
| Make | Lutron |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.5 MB |
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