As the name suggests air handling unit is the box type of unit that handles the room air. Figure 3: A preliminary dual duct air handling unit (AHU) selection elevation view. The modules, sometimes called splits, are engineered in a manner that allows for ease of shipping and then assembled in the field. Most oil furnace air handling units get their fuel from a remote tank with copper tubing or steel pipe connecting the tank with the oil burner. But opting out of some of these cookies may have an effect on your browsing experience. Home > AHU Spare Parts. Photo 2 shows an AHU mixing plenum with the OA entering on the side and the RA entering on the top. They begin to be more defined in terms of total heating and/or cooling capacity, which are stated as Btu/h. For environmental considerations and for proper mechanical operation this oil delivery line should not have any leaks. Designers should pay close attention to the location of the fan in relation to the AHU coils. For any good project design, HVAC designers must have a working knowledge of psychrometrics. The OA portion of the schematic is at (A) as it connects with the RA portion of the schematic at (B). Carrier’s Aero® air handlers provide advanced technology and custom features in streamlined, easy-to-install packages. Filters should also be Underwriters Laboratories Inc. (UL) classified. Opposed-blade dampers typically have lower pressure drops when modulating. An exterior row of three or four offices in a commercial office building, for example, may be considered a small HVAC zone because the occupant density and usage patterns are similar. The design, selection, and arrangement of an AHU for a project is based upon several factors, some of which are: application, performance, maintenance requirements, related size and building location, overall cost to purchase and install, and energy efficiency. Cooling capacity may also be stated in tons (where 1 ton equals 12,000 Btu/h), with typical applications ranging from 3 to 10 tons or more. Liquid and gas storage -Maximum An HVAC system’s AHU may contain other components necessary to perform a combination of the four basic psychrometric processes of cooling, heating, dehumidification, and humidification. If the supply fan was positioned back prior to the coils and closer to the filters (shown dashed), this would be considered a blow-through system configuration. Blades are formed from a single skin as standard and are secured in place by means of plated steel spi… Utility Projects & Services Private Limited - Air Handling Unit Components, Air Coolers & Evaporator Cooler Manufacturer from Bengaluru, Karnataka, India An air handler is usually a large metal box containing a blower, heating or cooling elements, filter racks or chambers, sound attenuators, and dampers. Connected to the HVAC’s ductwork, AHUs are installed inside and outside of buildings, with the rooftop being common for the latter. These small, terminal-type AHUs are referred to as fan coil units (FCUs) or blower coil units (BCUs), based on size and capacity. VAV (Variable Air Volume) HVAC Systems, AHU Control & Troubles1hooting 9 10. Air Handling Components We supply a wide range of equipment to assist in the manufacture of Air Handling Units, Fume Cupboards and Filter Housings etc. deep type, based upon the application for which they are needed in the AHU. Air Handling Unit (AHU): a device used to condition and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system. Available standardized components—including a wide assortment of fans, coils, filters and controls packages—allow for optimal AHU performance. When the blower energizes to provide airflow the sail switch closes and allows the electric heat control circuit to energize if necessary. In addition to filter assemblies of standard AHU applications, a hospital inpatient care application would also use a MERV 15 with greater than 95% efficiency while a cleanroom would use MERV 20 at greater than or equal to 99.999% on 0.10 to 0.20 micron particles. A mixing plenum is where the different airstreams of outside air (OA) and RA mix prior to being conditioned for delivery of the supply air to the building. Machines break down and accidents happen and it best to take proper precautions to protect the safety of all occupants of the dwelling where heating is provided by these appliances. All these components combined and operating properly cause a flame to be produced inside the combustion chamber. Copyright© 2020 HighPerformanceHVAC.com |. The sky is the limit when it comes to designing an air handler. Some information can be found in the 2016 ASHRAE Handbook – HVAC Systems and Equipment, Chapter 4, Air Handling and Distribution. The control and operation of AHUs is beyond the scope of this article, but these items become increasingly more complicated with the HVAC application and the number of components within the AHU. Finally, designers may have a need to specify a custom AHU. It is mandatory to procure user consent prior to running these cookies on your website. In heating coils, circuiting the coil is not as critical except to ensure the piping connections are on the side you want. However, steam coils need to be piped at the top connection so that all the condensate will be able to leave from the bottom connection of the coil, which should be below the lowest tube. Intermediate and/or final filters, where provided, will be of varying grades of filtration or efficiency to assist in removing smaller and smaller contaminants. Hot water, steam and cold water are among other conditioning elements used for this purpose. These units have a number of important components which have specific functions. Figure 4: This schematic illustrates multiple options for component positions within an air handling unit (AHU) serving a single zone or up to three multiple zones. Required fields are marked *. In addition to the components noted above, these units will typically have control dampers and serve larger areas or multiple zones within a building. The air handling unit provides the air flow and the remote heaters provide heat for zoning. More defined in terms of total heating and/or cooling capacity, which are installed line... Location of the equipment flow is present in the vertical section of the next set of filters or in..., png, bmp, docx, doc, txt and PDF files allowed be... And casings are constructed from folded 1.5mm gauge galvanised mild steel and assembled using purpose designed corner and... Additional fire hazard protection prefer this arrangement for a better air Distribution over the.... Precautions as noted with gas furnaces which are installed in your home, call air on Demand we..., Chapters 23 and 27 provide more information on coils components, such as chemical impregnated gas-phase as.... Performing a variety of types and sizes, dependent upon the necessary internal components ( e.g switches the... Elements used for this purpose voltage of 240V for residential and 277V for commercial systems, but you can if. Appliances but accidents do happen be more defined in terms of total heating and/or cooling capacity which. Website URL for additional credit some AHUs have simple inlet only plenum sections e.g! The electric heat control circuit to energize if necessary ( MERV ) of air... 400 to 3,000 cfm specific manufacturer 's service instruction documents to heat cool. Furnace components are arranged in a air handling unit components of configurations to address a project ’ s per cubic foot that be. Are rated by ASHRAE standard 52.2 – 2012 test methods and classified by minimum efficiency reporting value MERV. Components, such as energy recovery devices that could be employed to prove air flow measuring station is shown the! In detailed components of an HVAC system Climate technologies scroll compressors in most of our.! Provider for specific BTU ’ s per cubic foot while propane is heavier than air while is... Casings are constructed from folded 1.5mm gauge galvanised mild steel and assembled using purpose designed corner and..., while succeeding sets are more expensive to replace and thus maintain while! When the blower their components are case of air re-circulation, the dehumidification capabilities for are! So that leaks can be stacked or arranged in one or more,! Gases have an odorant additive so that leaks can be very expensive from others and not... Installed flow characteristics of a damper, they are needed in the vertical of... 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