Your air handler is an essential part of your “split” heating system. It is the indoor portion that delivers the heated air in the winter — quietly and economically. Depending on the construction of your home, specific air handlers will work best. No matter which unit you install, Fulford HVAC offers the best service and installation in the heating and cooling industry.
Chances are, the last thing you think about is your air conditioning or heating system. You just expect to be comfortable. That’s why Fulford HVAC is the best choice you can make for Heating your home in Brunswick or New Hanover counties. We simply offer a line of the finest heating and cooling solutions in the business. Top-quality products with the latest technology, dependable performance, great warranties and excellent service and support.
Air handlers or air handler units (AHUs) are appliances used to condition and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system. If you were to take a large metal box, mount a blower in it, have an opening in one end for intake air and another opening in the other end for the supply air, you would have an AHU.
The stripped down AHU without heating or cooling elements, can be used for air circulation, air purification, humidity distribution, or to introduce outside air into a structure. AHUs can be fitted with filter racks, air cleaners, hrv’s, humidifiers, ultra-violet lights, sound attenuators, zone systems, dampers, and more.
AHUs, more often than not, connect to ductwork that distributes the conditioned air through the building, and then pulls the air back to the unit. Although, some applications discharge supply and return air directly to and from the space served, without ductwork.
Small AHUs, for residential applications, may only include an air filter, air conditioning or heating coil, and blower. These units may be referred to as fan coil units (FCU).
The typical air handler has a large squirrel cage blower, or fan, driven by an AC induction electric motor to move the air. This motor may be a single speed motor, or it may be multi-tap to offer a variety of pre-set speeds, or it can be a variable frequency drive, which allows a wide range of air delivery rates.
Some residential AHUs may use utilize a brushless DC electric motor that has variable speed capabilities.
Larger commercial air handlers may utilize multiple blowers mounted at both the inlet and the supply ends of the unit. The typical residential unit has it’s blower located at the supply end of the cabinet. The filter set-up, heating and cooling elements are generally draw-through type, located on the return side of the unit.
Heating and/or cooling elements
Depending upon location and the particular application, an air handler may be called upon to provide heating, or cooling, or both. Fuel-burning heaters or a conventional Freon-based evaporator coil may be installed directly in the air stream. Electric strip heaters and heat pumps are used too. Evaporative cooling is possible in dry climates also.
Coils may also be installed for circulation of hot water or steam for heating, and chilled water for cooling. The hot water or steam would be provided by a central boiler, and the chilled water would be provided by a central chiller.
An AHU can also be used for geothermal applications, as well, for delivery of both heating and air conditioning. (this application will be discussed further in our geothermal pages)
Air filtration is a must for an air handler, especially in a residential application. The typical residential AHU comes equipped with a 1” media filter. Upgraded air filtration is desirable for most applications, in order to provide clean dust-free air to the building occupants.
Typically the air filter is located at the furthermost point of the return end of the unit. This is the also the most common location for any upgraded filtration options.
Ultra-violet lights for bacterial control may be installed in the unit, as well.
An evaporator is used in an air-conditioning system to allow a compressed cooling chemical, such as Freon or R-410A, to evaporate from liquid to gas while absorbing heat in the process. An evaporator coil consists of Expansion Valves, Solenoid, Temperature Sensor, External Equalizer, Super heat Adjustments.
Low & High Voltage Wiring Controls
Consists of contacters, relays, transformer, circuit boards.
Our Professional Recommendation
Click here to see American Standard Air Handlers