Global France Germany Italy Poland Russia Spain Thailand U.K. U.S.A. Electrical panel for AHU General characteristics In this complex modern society, personal welfare and comfort are of crucial importance. Correct humidification, besides reducing suspended dust, allows people in closed environments to breathe well, without problems resulting from dryness of primary airways. The reduction in skin evaporation due to correct humidification also reduces the sensation of cold and, consequently, the temperature can be reduced, thus saving on heating and limiting the dispersion of heat between indoor and outdoor areas. Air handling units are made up of different components, each one responsible for a specific process. Modularity is the most obvious characteristic of handling units, as these appliances are designed and sized based on specific requirements. Over the course of the year, these units can perform various functions: mixing, filtering and movement between recirculated air and outdoor air;

air pre- and re-heating air cooling air humidification and dehumidification During the winter season, dry air increases the level of dust present in the air. With correct humidification, the quality of indoor air can be improved by reducing the concentration of dust due to less fragmentation of fibres as well as a greater tendency for the particles to collect together and thus be more easily filtered. Office buildings often also include areas used for other activities. This makes designing systems and energy distribution more complex and creates a need for integration in order to optimise running costs. The well-being of people in the workplace is fundamental for improved productivity. However personal comfort is not the only application. A stable environment with the correct conditons is essential in order to preserve costly art works and objects over time. If the canvas constantly changes size, the painting, whose dimensions remain the same, will be irreversibly damaged. Wood and parchment objects would also be destroyed in a short amount of time if dryness in the environment starts to make them crack.

AHU Controls Flexible AHU control, optimised performanceAn air handling unit (AHU) can only be as good as its weakest link. We ensure via intuitive HVAC controls that the performance and efficiency of your system is optimised to minimise energy use and maximise output without compromising the environment.All of our HVAC control panels are designed and built within the UK.We offer AHU controls, packages and HVAC control panel options specific to each application: HVAC control panels can be installed and wired into the unit at our factory prior to delivery on site to minimise installation and commissioning timeWe provide integral trunking so cables and wiring are not visible and susceptible to external conditionsUnits can be delivered in one piece by strengthening the base – this eliminates the need for on-site wiring reconnectionShould the AHUs be supplied in sections, we also offer control panel wiring reconnection on siteOur aim with every controls package is to make the facility more versatile, productive and efficient, delivering both output and quality;

we have a wealth of experience and use the latest technology to help you get the most from your system, by managing workloads and using performance data to greatest effect.Our AHU control panels feature the latest technology Airedale ACIS™ controllers, with user friendly interface allowing monitoring and control of each component of your AHU including fans, heating, cooling, dampers, humidification and heat recovery. portable ac unit for vehicleOther control manufacturers are also available including TREND controllers, Tridium and Siemens and major Building Management System (BMS) protocols including SNMP, BACnet and Modbus.Total design flexibility is offered with each application with variable sizing options and a wide range of component choices available.hvac heat pump wiringFurther HVAC control panel features include:Completely customisable HVAC control panel designHigher availability with full visibility across the facility’s physical infrastructureTimezone management and alarm handlingFull control of remote devicesTemperature, humidity, CO2, air quality and pressure sensors (on request)Advanced control algorithms maintain required conditionsIntegration with remote electronic expansion valvesEase of service – design, installation, commissioning & maintenance all in one placeIncreased reliability due to factory mounted controlsFully standalone system or part of the BMShow a hvac thermostat works

Contact our expert controls team for more information Contact a Barkell Account Manager Download a product guide United States of America Thank you for your inquiry and interest in ABB.We will get back to you as soon as possible. An error occurred and your inquiry could not be sent. Please select country from the list HOME > Products > Products and Services for Building Automation > Products & Solutions > Building Automation Systems > Direct Digital Controllers > Infilex™ AC Air Handling Unit AHU Controller Infilex™ AC AHU Controller Infilex™ AC is a DDC (direct digital control) controller for AHU (air handling unit). It can be placed in a small place such as an AHU control panel. Infilex™ AC is equipped with inputs and outputs suitable for AHU control, and its software can be freely edited in response to the applications. In terms of operation, Infilex AC can be operated with an end-user terminal (Neopanel / Neoplate) or an operator interface (Operator Panel) in response to various situations.

Besides, it performs advanced control and management by communicating with center unit of savic-net™ FX BMS (Azbil Corporation's building management system) through our proprietary protocol NC-bus or LonTalk® protocol. Infilex AC integrated into BMS enables autonomous control since Infilex AC itself has the time scheduling function. Feel free to contact us for consultation or inquiries regarding these products. Your Complete Source for Building Automation SensorsVeris Industries (Click Message to Learn More) fabricate a control panel specifically for the safety device interlocking. Steve Calabrese is a Project Engineer with a large controls contractor serving the Chicagoland area, and author of the book Practical Controls: A GuideYou can visit his website at safety devices, or �limit� devices as they are alternately referred to, are devices that serve to protect a built-up air handling unit from unsafe operation, by putting a limit on the variable that they are sensing, and

�tripping� when that limit has been exceeded, thereby halting the normal operation of the air handling unit. A typical VAV air handling unit may be equipped with some or all of the following safety devices (and perhaps others as Low limit temperature controller High limit discharge static pressure controller Low limit suction static pressure controller temperature controllers protect hot and/or chilled water coils from excessivelyHigh and low limit static pressure controllers prevent fan housings and ductwork from pressure extremes. Smoke detectors monitor for smokeAnd fan vibration switches monitor for excessive fanAll of these controllers are used to protect the equipment in the event of abnormal system operation. such as these are typically electromechanical or electronic in nature, and the setpoint or �trip� point adjustment is integral to the device. such devices is the requirement for manually resetting them once they trip,

generally accomplished via a manual reset pushbutton on the device itself. device serving as a safety or limit will have a single set of contacts to wire to, whether it be a single-pole-double-throw contact, or simply a normally closed contact that opens upon a trip of the device. Generally speaking, in a Building Automation System (BAS), the devices are specified to be �hardwired� to shut down the supply fan, the return fan (if applicable), and interrupt power to the outside/return air damper actuators and hot/chilled water valve actuators. Interrupting power to the outside and return air damper actuators would cause the outside air damper to spring closed and the return air damper to springInterrupting power to the hot and chilled water valve actuators would (typically) cause the hot water valve to spring open and the chilled water valveThis of course is providing that the dampers and control valves are equipped with spring-return actuation.

could be wired in series, such that a trip of any device in the �limit circuit� would interrupt 24-volt power to all of the above components (fan starter relays, damper and valve actuators). However defeating this concept is the general requirement that a trip of any safety device needs to register through the BAS, in order to flag the condition and generate an alarm. practice dictates instead that each safety device powers a low voltagePower for the relays is commonly sourced from a single control transformer, perhaps located inside the control panel that houses the AHU control module. Each relay is powered through the normally closed contact of its respective safety device, such that when power is applied and all is well (no safety device trips), all relays are energized. interlock �limit circuit� can be accomplished via series connection of one pole of each of the double-pole relays, using the normally open contacts (which are

closed when the relays are energized). As long as all safety devices are untripped, and hence all relays are energized, the �limit� circuit is intact, and the AHU is allowed to operate as intended. A trip of any device de-energizes its respective relay, and the limit circuit is broken. The other pole of each relay is used to report safety device status to the BAS. may vary, the normally closed contact of this pole can feed a binary input on the AHU control module. This is done for each device. Since normal operation of any safety device results in its relay being energized, each binary input normally reads an open value. When a safety trips, its relay de-energizes, and its respective binary input reads a closed value. The BAS is programmed to recognize this and register a safety device trip alarm. Tip of the Month: While this may seem more labor-intensive than field-mounting the relays, it pays dividends when it comes to system commissioning,

troubleshooting, and general maintenance. : Design and fabricate a control panel specifically for the safety device interlocking. control transformer and all of the relays within this panel, and label each relay as to its function. Add a terminal strip for all incoming and outgoingWire all safety devices back to this panel. Wire the limit circuit within the panel, from relay to relay, and out to the devices that are to be affected (fan starter relays, damper and valve actuators). adjacent to the control panel that houses the AHU control module (next to it, underneath it, etc.), to facilitate wiring between the control module binary inputs and the relays. Or simply upsize the AHU control panel to accommodate these relays and terminal strips. Label the terminals and all incoming/outgoing seem more labor-intensive than field-mounting the relays, it pays dividends when it comes to system commissioning, troubleshooting, and general maintenance.

attended the University of Illinois at Chicago (UIC) and graduated in 1990 with a B.S. degree in electrical engineering. He began his HVAC career as a design engineer at Air Comfort Corporation, a family-owned mechanical services company. In 1993, Steve went to work for Midwest Mechanical Construction Company, a large, full service mechanical contractor serving the greater Chicagoland area. During his eleven years there, Steve migrated through various roles as mechanical systems designer, control systems engineer, controls group manager, book, Practical Controls: A Guide To Mechanical Systems, wasGeared toward the HVAC professional, the book details practical methods of controls and defines the role of HVAC controls in anSteve brings his mechanical contracting experience to this writing, and offers practical approaches to control systems issues. In 2004 Steve left the mechanical contracting end of the industry to go to work for Chicagoland�s

most tenured Automated Logic dealer. As a project manager-engineer, Steve�s day-to-day operations include control systems design and consultation, parts selection/procurement, installation management/support, startup and commissioning support, and project fiscal and schedule management. As a member of several professional associations, Steve actively participates in local seminarsHe attributes his mechanical HVAC knowledge and expertise, which includes pipe/duct sizing, load calculations, equipment selection, and shop drawings generation, to working many years for a mechanicalSteve couples his broad mechanical knowledge and experience with a strong background in the area of electricity and electronics. systems expertise runs the range from estimating and engineering to programming and commissioning, and he is well-versed in electrical and electronic stand-alone controls, as well as microprocessor-based direct digital controls (DDC)