Difference Between AHU and HVAC • Categorized under Miscellaneous | Difference Between AHU and HVAC What are AHU and HVAC? AHU, which is Air Handling Unit is an appliance used to circulate air. HVAC is Heating, Ventilating and Air Conditioning system. HVAC is the central unit to which AHU is connected. AHU is only a part of HVAC and as such there is hardly any difference between then two. HVAC mainly refers to the technology of automotive environmental comfort. The Heating, Ventilating and Air Conditioning system uses the principles of fluid mechanics, thermodynamics and heat transfer. The discoveries of by Michael faraday, Nikolay Lvov, Reuben Trane, William Rankine Wills Carrier, James Joule and Sadi Carnot among others had paved the way for Heating, Ventilating and Air Conditioning system. HVAC comes in medium to large designs. HVAC is used to condition the atmosphere in industrial houses, skyscrapers and aquariums. Air Handling Unit is a large metal box that conditions the air, which helps in creating a perfect atmosphere.

Blower/fan, Heating and/or cooling elements, Filters, Humidifier, Mixing chamber, Heat recovery device, Controls, Vibration isolators are some of the components that make a AHU. water around outside ac unitAir Handling Unit comes in three types. smallest ac unit in the worldThe Mall air handlers or terminal units are used for local use They mainly consist of coil, air filter and blower. home central air conditioner how it worksThen there is the Make up Air Unit, which is larger air handler. The third one is the Roof Top Unit, which is mainly used for outdoor use. It is mainly fitted n the roof of a building. As AHU is only part of HVAC, it can be hard to make out a difference between the two. As seen earlier, one system is part of another system and hard to differentiate them.

1. AHU is Air Handling Unit. HVAC is Heating, Ventilating and Air Conditioning system. 2. HVAC is the central unit to which AHU is connected. AHU is only a part of HVAC. 3. HVAC comes in medium to large designs. 4. Air Handling Unit is a large metal box that conditions the air, which helps in creating a perfect atmosphere. 5. Air Handling Unit comes in three types — Mall Air Handlers Make up Air Unit and Roof Top Unit. 6. As AHU is only part of HVAC, it can be hard to make out a difference between the two. (2 votes, average: 3.00 out of 5) : If you like this article or our site. Please spread the word. Share it with your friends/family. Written by : Prabhat S. and updated on October 10, 2010 Articles on DifferenceBetween.net are general information, and are not intended to substitute for professional advice. The information is "AS IS", "WITH ALL FAULTS". User assumes all risk of use, damage, or injury. You agree that we have no liability for any damages.

Prabhat S. "Difference Between AHU and HVAC." DifferenceBetween.net. October 10, 2010 < http://www.differencebetween.net/miscellaneous/difference-between-ahu-and-hvac/ >.Trane air handler troubleshooting Guide An air handler has many electrical and mechanical components that, without preventative maintenance, can degrade over time and reduce theIf you notice reduced or no air flow throughout your home, you will want to check your air handler unit’s air filter, evaporator coil, and blower motor for potential problems. Dirty or clogged air filters In order for your air handler to function properly, ensure that nothing obstructs the air flowing through your air handler unit. most common obstruction is a dirty air filter. your air filter regularly will not only improve the overall quality of your home’s air, but also prevent more costly repairs later on. new digital programmable thermostats display air filter change reminders making it easier than ever to ensure consistent system maintenance.

Recommended Action: Examine the air filter in each of your system’s components. If the filters looks dirty, clean or replace the filters as recommended in your use and care guide. problem persists, contact your local Trane Comfort Specialist Dirty or clogged evaporator coil Another common issue Trane Comfort Specialists encounter is dirty orThis happens when the system runs with noWithout an air filter, components inside the air handler become clogged with dust and debris. This can cause evaporator coils to freeze, which reduces the unit’s cooling capacity, and in some cases can force liquid refrigerant to return to the compressor. Recommended Action: Check for signs of water below unit and cold exterior surface of indoor coil enclosure. your local Trane Comfort Specialist. In the meantime, try turning your thermostat off for 1 to 3 hours to see if it will defrost. Failure to use or replace an air filter can also cause the blower

Excessive dust in the system makes the motor work harder, creating excess heat. As dust continues to build up, it can eventually cause the motor to burn out and require a replacement. : If your blower motor fails contact a Trane Comfort Specialist. Failure of the blow motor will require professional service.The requested URL /HVAC_Ind.php?hi=HVAC was not found on this server. 40RUAA16A2A6-0A0A040RU = Packaged Air Handling Unit with Puron® R-410A RefrigerantA = Standard DX CoilA = None16 = 15 TonA = None - Standard2 = Std Static, Std Efficient Motor / Med DriveA = Standard Aluminum Fin / Copper Tube6 = 460/3/600 = StandardA = Standard0 = NoneA = Standard0 = StandardCarrier’s versatile packaged air-handling units satisfy design requirements with:Multi-position design for horizontal or vertical installation without modification. Blower Motor HP3 1/2 HP Filter Size16 x 20 x 2 / 16 x 24 x 2 (Qty=4) Liquid Line Size1 1/8"Hospital's Aging Core Poses Maintenance, Engineering Challenges

Building-Automation System Streamlines Preventive Maintenance Part 3: Energy-Efficient Chillers, Air-Handling Units Demand More Maintenance Organization Closes Old Hospital, Opens New Facility Same Day By Chris Matt, Managing Editor - Print & E-Media HVAC   Article Use Policy The equipment lineup that has allowed Gateway Medical Center to operate at peak efficiency and optimize IAQ includes three centrifugal chillers, 22 air-handling units featuring variable-speed drives, the BAS, and high-efficiency particulate arrestance (HEPA) filters, which remove at least 99.97 percent of airborne particles 0.3 micrometers in diameter or larger. One chiller features variable-frequency drives, while the other two load and unload as needed. The old Gateway Medical Center did feature a BAS, but it was an older version of the system monitoring the new facility. Holzkamper says the newer technology does require more PM than the chillers and BAS in the old hospital. "When you get into variable-frequency drives, you have more electronics and more electrical parts involved in the controllers," he says.

"You have more electrical PMs and maintenance there. (The BAS) needs to be tuned up and looked at by the factory at least once a year to make sure it's working as it was originally designed to do when it was installed." While technicians were unfamiliar with some of the technology in the new facility, they were able to transfer their experiences with the BAS in the old hospital to the new. "It was fairly comparable to the new technology, so it wasn't a big learning curve," Skeens says. "That first year, we took a little time to find out little tweaks and nuances of the system. Maintenance-wise, it really saves a lot of time." One of the biggest equipment changes from the old hospital to the new was the air handlers. The old hospital, though it was 200,000 square feet smaller than the new building, featured 28 more air-handling units. The HVAC landscape of the old hospital, which featured under-window units on an entire floor, required more air handlers to meet the needs of various types of systems.

Similar to the chillers and BAS, the new air handlers also demand more maintenance. "On the newer units, you have more electronic sensors on the drives," Holzkamper says. "(The sensors) tell you, if you have dirty filters, to go in and clean them. They tell you basically everything that's going on with that unit. Of course, with more sensors and more electronics, you have more stuff that can go out on you." Despite being 200,000 square feet larger than the old hospital, the new Gateway Medical Center's energy bills are about the same as those of the old facility, Holzkamper says. Energy-efficient equipment, extra insulation, and improved maintenance practices all play a role in controlling energy costs. "It was a surprise for me because I figured (utility costs) would probably double," Holzkamper says. "But we had a 1954 core in the old hospital. When you have something like that and you start building additions to it, you actually have to bring all the utilities to the addition because the core was never set up for it.