HVAC Systems, Parts,Repair and Service And Repairs
Posted: January 3rd, 2009 | Author: admin | Filed under: HVAC | Tags: "damper control with limit switches", "heat pumps churchland", "heat pumps great bridge", "heat pumps repair chesapeake" | No Comments »
What is HVAC?
Hvac – an acronym for Heating, Ventilation & Air- Conditioning
Heating and air-conditioning systems control the temperature, humidity, and the total air quality in residential, commercial, industrial, and other buildings. Heat pumps, which are similar to air conditioners but can be reversed providing both heating and cooling for a home. Heat pumps uses mechanical energy to pump heat “up the temperature scale” from a cooler region to a warmer one, and it does this by changing the pressure of a working fluid called a refrigerant. Heat pumps are more complex, and because they run in both summer and winter, they often require more maintenance and need to be replaced more frequently than traditional furnaces and air condition
Heat Pumps Fall Under Different Categories Such As:
* Air-Source Heat Pumps
* Ground Source (Geothermal)
* Water Source Heat Pumps
Who Install, Repairs and Maintains these Systems?
Individuals that specialize in heating, air-conditioning, and refrigeration, and they go by the terms technicians, mechanics and installers. They install, maintain, and repair systems. Heating, ventilation, air-conditioning, and refrigeration systems many times referred to as HVACR systems, these repair technicians may also be called HVACR technicians. Properly trained technicians repair, and maintain systems, but you will find that many have elected to specialize in installation, maintenance & repair, heating systems, refrigeration care, or air conditioning. Finding a technician who specializes is a brand or special equipment type is another great way to locate the right technician for the job. It always a good idea to find a technician that is familiar with our brand or type of system.
What Are the Component Units?
Heating, air-conditioning, heat pumps and refrigeration systems are a dizzying mix of many mechanical, electrical, and electronic components. These include components such as motors, compressors, pumps, fans, ducts, pipes, thermostats, 4-way reversing valve, bi-directional expansion valve, thermal expansion valve
or " TEV ", air conditioner compressor ,condensing coil, air filters, refrigerants, room thermostat, electrical switches, fuses or circuit breakers, blower fan, numerous switches, and more.
Air Conditions Systems how do they Work?
Air conditioning or heat pump compressor which compresses low pressure refrigerant gas into a higher pressure, higher temperature gas. Usually the compressor is in the outdoor portion of an air conditioning or heat pump system. The compressor is basically a high pressure pump driven by an electric motor
A condenser or condensing unit: typically a condensing coil inside which high temperature high pressure refrigerant gas flows, and over which a fan blows air to cool the refrigerant gas returning it back into a liquid state (this transfers heat from the refrigerant gas to the air being blown by the fan).
A metering device which dispenses liquid refrigerant into a evaporator coil.
The metering device may be basically a thin section of tubing (a capillary or "cap" tube) or it may be a bit more sophisticated thermostatic expansion valve (TEV ) which includes a temperature sensing control that can open and shut the device against refrigerant flow an evaporator coil or cooling coil: usually the cooling coil is a section of finned into which liquid refrigerant is metered and permitted to evaporate from liquid to gas state inside the coil.
An air handler and blower unit which provides a fan, that blows building air across or through the evaporator coil. The air handler blower fan unit moves building air across the evaporator coil surface in order to condition building air by cooling it (this removes moisture from the cooler air).A duct system which sends conditioned air from the air handler into the supply ducts, and which then takes air from the ducts and returns it to the cooling system air handler.
Controls and features , which include a room thermostat, electrical switches, fuses or circuit breakers, condensate handling system, and air, filters.
How Do Forced Air Heating Systems Work?
When a technician installs a central forced air heating systems it works like this, a furnace heats the air, which is then, circulated via a system of metal or fiberglass ducts. Technicians must be able to maintain, diagnose, and correct problems throughout the entire system. To do this, they adjust system controls to recommended settings and test the performance of the system using special tools and test equipment. After a furnace or air-conditioning unit has been installed, technicians often asked to perform routine maintenance and repair work to keep the systems operating efficiently. Technicians may adjust burners and blowers and test for leaks. If the system is not operating correctly, they test the thermostat, burner nozzles, controls or other parts to diagnose and correct the problem as needed. During the winter heating season, air-source heat pumps cease to be effective when the outside air temperature falls below 25-35°F. To handle such conditions, they are supplied with a supplemental heating system – usually electric resistance strips to further warm the building supply air after it leaves the indoor coil. You will find that you need to hire technicians or perform the maintenance work yourself, such as replacing air filters, inspecting cleaning ducts, overhauling compressors, and maintaining other parts of the system that may accumulate dust, mold or other impurities during the operating seasons.
How Does a System Get Installed?
They follow blueprints, design specifications, and manufacturers’ instructions to install motors, compressors, condensing units, evaporators, piping, and other components. They connect this equipment to the ductwork, refrigerant lines, and electrical power source. After putting the equipment in place, they install fuel and water supply lines, air ducts and vents, pumps, damper control switches, and other components . They may connect electrical wiring and controls and check the unit for proper operation. To ensure the proper functioning of the system, furnace installers often use combustion test equipment, such as carbon dioxide testers, carbon monoxide testers, combustion analyzers, and oxygen testers. These tests ensure that the system will operate safely and at the highest level of efficiency. After making the connections, they charge the system with refrigerant, check it for proper operation and leaks, and program control systems. You will find that heating, air-conditioning, and refrigeration mechanics/technicians, and installers use a variety of tools, including hammers, wrenches, metal snips, electric drills, pipe cutters and benders, measurement gauges, and acetylene torches, to work with refrigerant lines and air ducts. They use voltmeters, thermometers, pressure gauges, manometers, and other testing devices to check airflow, refrigerant pressure, electrical circuits, burners, and other components. It is possible to fix small components yourself, but if you do not have many of these tools, you may be hard pressed to do the job correctly yourself.
Can I Buy My Own Replacement Parts?
Yes, if you can find the parts yourself, you can save some of the mark up price many installation companies tack on. Don’t be timid about requesting a price for parts & service, and another price for service alone. You might be surprised on the mark up some companies charge on comparable items.Commercial HVAC systems.
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