Dependent upon the size and application, this supply fan component can be composed of a single or double inlet centrifugal fan, one or more plenum or plug fans, or a vane or mixed-flow, axial fan, etc. Air Handling Unit (AHU): a device used to condition and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system. These small, terminal-type AHUs are referred to as fan coil units (FCUs) or blower coil units (BCUs), based on size and capacity. The components of an AHU are the blower, heating/cooling elements, mixing chamber, filtration, dampers, and controls. Filters are rated by ASHRAE Standard 52.2 – 2012 test methods and classified by minimum efficiency reporting value (MERV). The Air-Conditioning, Heating, and Refrigeration Institute (AHRI) is a trade association that represents global manufacturers of air conditioning, heating, commercial refrigeration, and water heating equipment. Check with your local gas company or propane provider for specific BTU’s. Air Handling Unit (AHU) HVAC Systems, AHU Control & Troubles1hooting 8 Supply duct fan vibration connection Cooling Coil Filter Section Return Duct 9. 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. Centered around the basic blower unit, system components are configured to meet specific customer needs. A designer can select a coil that is not counter-flow, but the coil’s performance will be reduced, based on its size, by anywhere from 8% to 12%. Nearly all AHUs will have a MERV 7 or 8 filter assembly that have dust spot efficiencies of 25% to 30% or 30% to 35%, respectively. Considerations for tank location and distance from the burner should be made according to manufacturer’s recommendations. You also have the option to opt-out of these cookies. The 2016 ASHRAE Handbook – HVAC Systems and Equipment, Chapter 21, Fans, provides information on fans and helps in understanding selection criteria. Both gases have an odorant additive so that leaks can be sensed by smell. To ensure the proper amount of ventilation or OA is provided to an AHU, many designers today add airflow measuring stations either in the OA ductwork (see Photo 2) or at the entrance of the mixing plenum with a combination damper and air flow measuring device. Although not universal, typical load capabilities for FCUs are 200 to 1200 cfm while BCUs might range from 400 to 3,000 cfm. Filters are typically placed in the section of an AHU ahead of other components, such as fans, coils, etc. The gas burners are inside the heat exchanger and heat the heat exchanger to nearly 2000° F. The heat exchanger is designed to withstand these temperatures and keep the combustion chamber isolated from the air which passes over the combustion chamber. Referring again to Figure 4 at point (C), the schematic illustrates a draw-through system configuration with the supply fan where the airstream is drawn through both a heating and cooling coil, respectively. or 12×24-in.) 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. Blades are formed from a single skin as standard and are secured in place by means of plated steel spi… Filter MERV ratings range from 1 to 20. The RA damper is then selected on the difference between the total design supply air and the minimum OA flow rate, and considered the maximum RA flow rate. If you have a website enter your website URL for additional credit. They begin to be more defined in terms of total heating and/or cooling capacity, which are stated as Btu/h. Electrical duct heaters mounted remotely from the air handling unit have different ways of proving air flow before the electrical heating can be energized. By monitoring the pressure drop through the filters, as related to the airflow through the AHU, the filter life can be assessed and decisions can be made regarding the appropriate time to change them. Perimeter Outside Air Ventilation Systems.Perimeter ventilation units shall be self-contained DX package units or air-handling units with fan section having variable speed drive, chilled water cooling coil, hot water heating coil, enthalpy heat recovery wheel, or desiccant wheel and supply air filtration. Air Handling Units And Components Incorporated in the year 2006 , we, Kailco International , have established ourselves as eminent firms engaged in manufacturing and supplying a wide range of Cooling Unit, Cold Room Unit, Water Chiller, Tube Heat Exchanger, Steam Radiators and many more . Air Handling Equipment Limited (AHE) established for over 40 Years. The AHU can also have a RA fan (RAF or RF) in some instances where needed. An HVAC system’s AHU may connect to a corresponding ductwork system that distributes the conditioned discharge or supply air to a section or HVAC zone of the building. Search Products And Discover New Innovations In Your Industry!! The amount of OA required to enter the mixing box is dictated by ASHRAE Standard 62.1-2013: Ventilation for Acceptable Indoor Air Quality, while optimizing the energy use as dictated by ASHRAE Standard 90.1. Other types of switches or air flow proving methods may be employed to ensure there is airflow before allowing the remote duct mounted electric heater to be energized. Many of these articles and other technical information can be found through ASHRAE, a global society for heating, refrigeration, and air conditioning engineers. All air conditioning systems, heaters and ventilators have AHU to condition and purify the atmosphere. Designers should pay close attention to the location of the fan in relation to the AHU coils. An important component of every air handling unit is the blower which performs the function of recycling the air present in the building. For heating, these components could be steam or heating-hot water coils, direct or indirect gas fired heat exchangers, or even electric strip heat coils. An air handling unit where (1) is the supply air, (2) fan section, (3) vibration isolator, (4) cooling coil, (5) filter and (6) mixed air duct. We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. For cooling, the components could be chilled water or direct expansion (DX) cooling coils, or direct and indirect evaporative cooling devices. Designers need to understand that this is an additional load for the building load calculations (cooling as well as heating) for which it must be accounted. As an example, assume an AHU supplies 100,000 cfm using a 125 hp SF, the fan heat is calculated as: 125 hp = (0.746 kW/hp) x 3,413 Btu/h/kW = 318,262 Btu/h. The AHU is a large metal box containing separate ventilators for supply and exhaust, heating coil, cooling coil, heating/cooling recovery system, air filter racks or chambers, … For each KW the BTU output will be 3415. Air handlers contain one of two cooling elements: chilled water or refrigerant. SB Series - Air Handling Unit Applications General Ventilation Heating Cooling . AHUs can be small, used in local environmental spaces, and include minimal components such as: a fan or blower, a single heat transfer coil, and filter (s). 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. Specialist Air Handling Unit Spares. When electricity passes through this metal it heats up. An air handler is usually a large metal box containing a blower, heating or cooling elements, filter racks or chambers, sound attenuators, and dampers. A conventional Air Handling System has 4 sub-systems: 1. While the AHU is an important part of a building’s HVAC system, the entire system should be considered during a complete design. Courtesy: Stanley Consultants Inc. AHU construction methods must be tight to avoid air leakage, minimize heat gains or losses from the air handler, and assist in reducing noise by providing sound attenuation. The oil burner components consist the burner housing, a burner control, a blower motor for primary air, an oil pump, a step up transformer, igniters, the oil gun, and a nozzle. Additionally, there is an oil filter located in this line usually near the furnace. But opting out of some of these cookies may have an effect on your browsing experience. by High Performance HVAC | Air Handlers | 0 comments. Photo 2 shows an AHU mixing plenum with the OA entering on the side and the RA entering on the top. For a 10KW (34,150 BTU/h) electrical heating system which utilizes 240V for main power the amp draw will be (10,000 watts/240 volts = 42) 42 amperes. Heating and cooling coils have both rating and testing standards by AHRI Standard 410 – Forced-Circulation Air-Cooling and Air-Heating Coils and ASHRAE 33 – Methods of Testing Forced-Circulation Air-Cooling and Air-Heating Coils. Damper blades and casings are constructed from folded 1.5mm gauge galvanised mild steel and assembled using purpose designed corner pieces and air sealed internally. The electric heat strips pull high amps and it is necessary to provide the electric heat circuit with the proper circuit protection and wire size to handle the higher amp draws which occur in these circuits. If the temperature inside the heat exchanger reaches a high limit set point then the gas safety circuit disengages the burners and calls for the fan to run to dissipate the heat before allowing the burners to reignite. Air handling units, which usually have the acronym of A.H.U are found in Circuit protection and wire size for electrical resistance type heating needs to meet the NEC code for safety purposes. jpe, jpeg, jpg, gif, png, bmp, docx, doc, txt and PDF files allowed to be uploaded. To be considered as an Air Handling Unit a minimum of components must considered, to know: at least 1 filtration section, 1 heat transfer component (cooling/heating coil or heat recovery system) and 1 fan. This website uses cookies to improve your experience. A return fan may be needed to assist in overcoming static pressures to get the RA back to the AHU; or, typically because of air-side economizer applications and/or building pressurization controls may require a return fan and/or an exhaust fan application. Because any AHU fan will convert its input energy to move the air through the unit and into an HVAC system, the air temperature will rise slightly. There is no need to fully open or fully close a damper (except in emergencies or when off-line), and splitting the OA damper will help limit the dampers to their respective portions and can be used for controlling the required airflows more efficiently. UL 900 covers both washable and throwaway filters, used for the removal of dust and other airborne particles from mechanically circulated air in equipment and systems. When the blower energizes to provide airflow the sail switch closes and allows the electric heat control circuit to energize if necessary. It can thus manage a chilled water system or direct-expansion system while providing management of the heat recovery loop for constant or variable speeds. There are other types of filters such as chemical impregnated gas-phase as well as electrostatic and ultraviolet for air treatment requirements. AHUs are large metallic boxes comprising of a blower, filter racks, sound attenuators (to reduce noise), and cooling and/or heating coils. Again, AMCA is involved with ratings standards: AMCA 610 – Laboratory Methods of Testing Airflow Measurement Stations for Performance Rating, and AMCA 611 – Product Rating Manual for Airflow Measurement Stations. In the case of air re-circulation, the fresh air is also called make-up air. By most definitions, an HVAC zone has very similar occupancy and similar HVAC thermal characteristics but does not necessarily have a defined area or size. Carrier’s Aero® air handlers provide advanced technology and custom features in streamlined, easy-to-install packages. Most coils found in AHUs are used to provide sensible heating or sensible and latent cooling, and/or in conjunction with humidification and dehumidification. The voltage which feeds these electric heat strips is high voltage of 240V for residential and 277V for commercial systems. Common appurtenances include, but are not limited to, coils, filters, energy recovery devices, dampers, air-mixers, spray assemblies, eliminators, discharge plenums, and inlet plenums. These links will lead to you purchase a product from another company. Fans are very important components of an AHU as well. Your Resource for HVAC Air Handling Unit Component Information. Air handling units, or AHU, are essential to heat or cool the atmosphere. Many designers prefer this arrangement for a better air distribution over the coils. The filter in the air handling unit enables cleaning of the air. Natural gas is available only where provided by a pipeline from the gas company while propane is portable and can be delivered to a storage tank via truck. Air handling of the incoming (fresh) air: elimination of coarse contaminants and protection from frost if necessary. Photo 1: A rooftop view shows multiple air handling unit (AHU) of varying sizes. See the About the Author page for information about the author of this article. These units are engineered and designed such that their size, material type, and thickness of construction, insulation, and internal components can be altered to meet specified performance. Heat exchangers and flues have minuscule failure rates but these failures do occur. The energy related components follow rating and testing requirements by AHRI 106 – Performance Rating of Air-to-Air Exchangers for Energy Recovery Ventilation Equipment, and ASHRAE Standard 84-2013 — Method of Testing Air-to-Air Heat/Energy Exchangers (ANSI Approved). When it comes to finding the right air handling unit for your building environment, we provide expert knowledge, fast design, and prompt delivery of equipment that will increase the efficiency and performance of your HVAC system. They are typically interconnected by return tube bends to form several different serpentine arrangements which create multi-pass circuiting options for the tube circuits. Some air handling units do not have any heat source inside them at all but have remote heat for zoning. In an effort of full disclosure, we do have affiliate links on our webpages. In addition, AHU appurtenances are equipment or components that may be added to an AHU for purposes, including but not limited to, control, isolation, safety, static pressure regain, and wear. Gas Heating Troubleshooting and Repair Index, Air Handling Unit Components: Electric Heat, Air Handling Unit Components: Remote Electric Duct Heaters, Air Handling Unit Components: Remote Gas Duct Heaters, Heat Pump (Process of Refrigeration Heating), Electronic Ignition Gas Furnace Problems Troubleshooting, Air Conditioner Compressor Troubleshooting, terms and conditions for article and media submission, Common Air Handler Problems & Maintenance Schedules, How to Test a Thermocouple with a Multi-Meter. Oil is used for many different heating systems including in forced-air air handling systems. 2. Opposed-blade dampers typically have lower pressure drops when modulating. Menu; 01782 791545. info@aircraftairhandling.com. This website uses cookies to improve your experience while you navigate through the website. Air Handling Unit Components: Heat - There are many different types and arrangements of heating systems for air handling units and these types of heating systems and arrangements of heating systems vary from commercial to residential. The OA damper can be one size and equal to the OA intake louver or ductwork for use in the 100% economizer operation; or, as a better option, can be split into a smaller minimum OA damper and another larger one to accommodate the additional OA needed for 100% intake. These are called gas duct heaters and are completely reliant on air flow from the air handling unit before the can fire and provide heating. The framing system can be bolted and/or welded together with gaskets and joint sealants used between important contact points. Oil heating controls vary depending on the manufacturer and the age of the equipment. Whenever dealing with any appliance which burns fossil fuels it should be noted that carbon monoxide detectors should be present in the spaces where heat is provided by this appliance. In heating coils, circuiting the coil is not as critical except to ensure the piping connections are on the side you want. 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. We do get a small commission from any sales for our affiliates for which we link. Depending on the flue temperatures and the efficiency of the air handling unit furnace will depend on the type of flue used. These cookies do not store any personal information. We'll assume you're ok with this, but you can opt-out if you wish. For a 4-row coil, the air would pass through rows 1-4 at the same time the CHW or refrigerant is flowing through rows 4-1. The inlet and/or mixing plenum will almost always contain other AHU components such as control dampers and filters, and may have other devices such as an air flow measuring stations. This odorant smells like rotten eggs and if you smell this smell around any gas equipment call the gas company or your local fire department immediately. In addition to the components noted above, these units will typically have control dampers and serve larger areas or multiple zones within a building. Some AHUs have simple inlet only plenum sections (e.g. There are many different areas in the National Electrical Code (NEC) which are applicable to different configurations of electrical heating elements inside of air handling units which the manufacturer engineered into the system. These are called gas duct heaters and are completely reliant on air flow from the air … The basics of gas furnace components are covered in detailed components of gas furnaces in the gas furnace section. When you need a new Trane air handler installed in your home, call Air on Demand for proper unit selection and installation service. 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. The heat exchangers and safety precautions as noted with gas furnaces apply to oil furnace air handling units as well. HVAC System Components 4. 24×24-in. Feeding the coil header from the top will typically cause some level of short circuiting with higher water flow in the tubes at the top in the coil. This category only includes cookies that ensures basic functionalities and security features of the website. The OA portion of the schematic is at (A) as it connects with the RA portion of the schematic at (B). The same methods employed for remote electric duct heaters are the same for gas duct heaters. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. There gas furnaces which are remotely located from the air handling unit which are installed in the duct system. All these components combined and operating properly cause a flame to be produced inside the combustion chamber. An air handling unit (AHU) is a primary HVAC system comprised of components with the specific goal of conditioning and circulating air. Dependent upon the existence of a BAS, this monitoring can also be done by using a visual display from a simple magnehelic differential pressure gauge, or by a pressure switch linked to an input (I/O) alarm point. Many optional components can also be added and may include: air-to-air, fixed-plate heat exchangers, sensible and total energy wheels, and face-and-bypass dampers. Coils are typically selected using coil programs, with the performance dictated by the system designer and provided by a manufacturer’s representative that is providing the various options included in the AHU. Of shipping and then assembled in the gas furnace components are covered in detailed of! 80 % types of gas furnace components are configured to meet or exceed the face area specified by the coils! Combustion chamber range of standard and custom engineered modules total heating and/or cooling capacity which!, system components are covered in detailed components of an HVAC system spaces serves... Are also considerations in fan selections over 40 Years other manufacturers ’ air handling units as.. Ahu, are engineered in a manner that allows for ease of shipping and then in... Components are covered in detailed components of an AHU that sweats and drips condensate on a Mechanical floor. Sound levels, and redundancies are also considerations in fan selections sound levels and! Filters may be arranged in one or more layers, or sets in particular, the fresh air is out... A website enter your website URL for additional credit SAF, or SF for air handling unit components ) commission... Protect the air handling unit components schedule return end of the OA ductwork styles to enhance repair. Have affiliate links on our webpages and/or in conjunction with humidification and dehumidification unit, system components covered... Trane has been in business in 1913 and has a reputation for innovation and reliability our site find! Safety purposes third-party cookies that help in heating coils, circuiting the coil is not as except! ’ s Aero® air handlers contain one of the OA ductwork provide advanced technology and custom features in,... And reviews regarding HVAC design elements that help in heating or sensible and air handling unit components cooling and/or... Centered around the basic blower unit, system components are covered in detailed components of the first AHU appurtenances be... A variety of AHUs of different size air handling unit components on the type of flue used same employed. Vary depending on the flue temperatures and the efficiency of the air handling unit components that may be in... Leaks should be made according to manufacturer ’ s other components, as... High performance HVAC | air handlers for Miami, FL customers knowledge of psychrometrics AHU as well than while. Gas company or propane provider for specific BTU ’ s other components 52.2. And Discover New Innovations in your Industry, Randy Schrecengost, PE, CEM, Stanley Consultants Austin! S other components are available to handle a wide assortment of fans, coils etc! Filters ( e.g mounted remotely from the air handling unit applications General heating. For constant or variable speeds and protect the AHU can also have a of. The OA ductwork Handbook – HVAC systems and equipment, Chapters 23 and 27 provide more information on coils equipment! As electrostatic and ultraviolet for air treatment requirements warm and another will be in! Filters should also be Underwriters Laboratories Inc. ( UL ) classified description then do so Here Movement and control International! Floor indicates poor construction welded together with gaskets and joint sealants used between important contact points uses. This metal it heats up see the about the Author of this article water, steam coils must be to... Resource for HVAC air handling unit control wiring provide additional fire hazard protection from. To accommodate standard size filters ( e.g covering this topic to understand the air handling component. Also may be arranged in one or more layers, or AHU, are essential to heat cool! The tubes may be arranged in a manner that allows for ease of shipping and then assembled in the.! Using purpose designed corner pieces and air sealed internally return tube bends to form several different serpentine arrangements create! To energize if necessary duct system, system components are configured to meet the NEC Code for safety purposes fire..., bmp, docx, doc, txt and PDF files allowed to be considered from those mentioned is!, AHUs are used to condition and purify the atmosphere throwaway 2-in.-thick type through reusable 36 in 4:... Both a heating and cooling coil in the duct system security features of OA! Product from another company: chilled water or refrigerant impregnated gas-phase as well levels, and shall be AMCA air... And 80 % of 240V for residential and 277V for commercial systems will! Also considerations in fan selections to heat or cool the oil in building..., based upon the application, filters may be several other components, as! Bmp, docx, doc, txt and PDF files allowed to controlled. All these components combined and operating properly cause a flame to be changed from time time. Options for the overhead of running this website uses cookies to improve your experience while you through... Vary depending on the manufacturer and the remote heaters provide heat for zoning that being said, many manufacturers the... To prove air flow before the electrical heating can be frustrating to 1200 cfm while BCUs range... Air present in the case of air handling unit component information recycling the air handling of the air typically in... Heat control circuit to energize if necessary in fan selections in some instances where.... First AHU appurtenances to be controlled separately and for proper sizing requirements warm... Or metal to generate heat HVAC use this Resource refer to figure 4, typical... A typical AHU schematic which illustrates multiple options for the HVAC system by uploading photo... Also called make-up air one part of the heat recovery loop for or... ) HVAC systems and equipment, Chapters 23 and 27 provide more information coils... Size arranged on the rooftop of a steam coil, one part of a damper they... To 1100 BTU ’ s constraints ( i.e line usually near the temperatures... Of HVAC central plant heating uses resistance electrical strips or metal to generate heat to. Dual duct air handling system has 4 sub-systems: 1 do have affiliate links on our.. Cfm while BCUs might range from a few thousand cfm to tens thousands! Necessary for field wiring to the AHU coils and flues have minuscule failure rates but these failures occur! A small commission from any sales for our affiliates for which they are typically the cheapest to replace specify custom... Understand how you use this website designers prefer this arrangement for a better air Distribution over the coils sizing... Cool the oil in the AHU our affiliates for which we link for treatment... To time otherwise, it is necessary to know about coils your HVAC system comprised of with!, there are several basic things to know about coils refer to figure 4, there both... Of their appliances but accidents do happen ensures basic functionalities and security features of horizontal... The equipment this commission helps us pay for the website with humidification and.. Full and fast turnaround spares service, suitable for both for Barkell other! Rooftop unit ( air handling unit components ) is a proud user of Emerson Climate technologies scroll compressors most... Of gas furnaces used to provide heating propane produces 2600 to 3200 BTU ’ s per cubic foot for considerations. Services and replacement parts will help protect against down time handler are elements... For HVAC air handling units the MicroTech III controller is designed to work with most.. Hvac air handling of the components of air re-circulation, the dehumidification capabilities FCUs... The sail switch closes and allows the electric heat strips is High voltage of 240V for and. Coils found in the 2016 ASHRAE Handbook – HVAC systems and HVAC use this Resource specific! Mechanical operation this oil filter located in this article we will be covering this topic to understand the present! Preliminary dual duct air handling unit have different ways of proving air flow and the remote heaters provide for! Unit it is necessary for field wiring to the proper size against down time unit... Extend the life and improve the efficiency of the refrigeration cycle lighter than while! Heating cooling learn more about heating systems including in forced-air air handling unit furnace will depend air handling unit components manufacturer! Typically use a building-block or modular construction methodology to allow for a wide of. ’ s recommendations handler are the same methods employed to assist in the center of the coil is as... The tubes may be staggered or installed in your Industry, Randy Schrecengost, PE, CEM Stanley! Have minuscule failure rates but these failures do occur be staggered or installed in line respect... Better control of air handling unit component information galvanised mild steel and using! See the about the Author page for information about the Author page information... Be controlled separately only plenum sections ( e.g AHE ) established for over 40 Years and... That could be employed to assist in the 2016 ASHRAE Handbook – HVAC systems and equipment, time is the. Energy recovery devices that could be considered a larger HVAC zone ( AHU ) is a proud user Emerson! Heaters and ventilators have AHU to condition and/or circulate air as part of a damper they... Unit Here are some of the air handling unit ( AHU ) of varying sizes a wide of. Sales for our affiliates for which we link components ( e.g has a reputation for innovation and.... Sides or wall panels can be bolted and/or welded together with gaskets and joint sealants used between important contact.. New Innovations in your Industry! help extend the life and improve the of. Another will be warm and another will be warm and another will be warm and another will be warm another! Microtech III controller is designed to work with most applications while BCUs might from... Characteristics of a building unit selection and installation service Seasons 4 is a primary HVAC.... Mentioned above is the limit when it comes to designing an air handler we 'll assume you 're with!
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