Multiple temperature sensors optimally control the air handling unit and fan coil unit. When connecting to an air handling unit, the supply air temperature is controlled by the discharge sensor. When connecting to a fan coil unit, the room temperature is controlled by the return air temperature sensor. Arrangement as part of a VRF system Supports a wide range of capacity classes 2 EEV units can be connected in parallel and up to 20 HP (50 kW) large capacity units. (Separation Tube of UTP-LX180A is required.) Connectable capacity range: 5 kW to 50 kW A variety of controls to match the application Central control using our VRF controllers or central management controllers Central control from external controllers Heating / Cooling operation mode Possible to control via a MODBUS enabled BMS by using optional interface. Connectable VRF series: J-IIS, J-II, V-II, VR-II Connectable DX-Kit system capacity range: 50 to 100% of the outdoor unit capacity

Connectable DX-Kit system capacity range with indoor units: 30% or less of the outdoor unit capacitywiring length from control unit: 10 mpiping length between EEV unit and indoor unit: 5 m Outdoor installation: Control unit (IP54 class) and EEV unit can be installed at an outdoor space. For 2EEV units connection (option) Separation Tube: UTP-LX180A Piping and wiring length Make Up Air UnitAMX Series Make-up air unit is ideal to compensate the process exhaust air or for general ventilation to respect codes and regulations. The installation of an Make-up air unit is the most efficient way to maintain indoor air quality by diluting airborn contaminants with outside fresh air.  Also, the addition of Airextube flexible supply air duct named will eliminate the air stratification often seen in high open areas thus reducing significantly the energy consumed to heat the space. The outside air is drawned up through the filtered hood and passes in a serie of controlled dampers and tempering device using gas or electricity to produce energy. 

The tempered air then goes through the high efficiency fan to be redirected in the distribution/destratification air supply duct. Gas/electric or propane heating device Belimo motors modulating devices CSA approved control panel Reduction of infiltration of cold air and outside contaminants Eliminate the building indoor negative pressure.tax rebate for new ac unit Improve the efficiency of gas heating equipments.how to replace filter on ac unit Improve the efficiency of process exhaust equipments.air conditioning unit rent Reduce the energy consumption. Airex Industries SpeedFX to modulate the amount of treaded air and reduce energy consumption. Glycol based heat recovery network Thermal storage with Airex PCM (Phase Change Material)

The new 2010 PowerFX Combination of the above for optimum efficiency Indoor air quality to respect local codes and regulations If you have any questions or request, please contact us by phone or by filling the form below. Preventing Combustible Metal Dust Explosions - Part 4 Preventing Combustible Metal Dust Explosions - Part 3 Preventing Combustible Metal Dust Explosions - Part 2Damper control characteristics and mixing effectiveness of an air-handling unit combination mixing/filter boxOpen with your PDF readerAIR HANDLING UNIT KIT - AHU KIT Heat exchanger, Fan & Fan motor to be mounted in AHU Kit shall be provided in the field.AHU connection Kit can be connected this (field supplied) AHU Kit system. (Contents of kit: Control PCB, expansion valve, sensors)Application: Hotels, offices, server rooms or all large buildings where air quality control such as humidity control and fresh air and is needed.AHU Kit combine air conditioning and fresh air in only one solution.

6N SERIES 2-PIPE ECOi OUTDOOR UNIT SHALL BE USED FOR AHU CONNECTION KIT.2 models for VRF system: 10 HP (CZ-280MAH1) and 20 HP (CZ-560MAH1) WITH GHP OUTDOOR UNITS:· One AHU kit may be used for one GHP unit (2 way, 56 kW). Multiple AHU kits cannot be used.· Mix connection with standard indoor units is not allowed.· Power specifications are single-phase 220 V to 240 V.CAPACITY: 60HP (168 kW)PIPING LENGTH: 180 mTOTAL PIPING: 210 m ELEV. DIFF. (O_U~I_U): 50 m (O_U ABOVE) ELEV. DIFF. (I_U~I_U): 4 m IN/OUT CAPACITY RATIO: 50~100%I_U NUMBER: 2 UNITS* AVAILABLE TEMPERATURE RANGE IN HEATING: -15~15.5 °C AVAILABLE TEMPERATURE RANGE FOR THE SUCTION AIR AT AHU KIT: COOL: 15~24 °C / HEAT: 10~30 °CWe are in the midst of finalizing our data center design and keep going back and forth on the following: This will be an approximately 7,200-sq. ft data center. There will be approximately 500-700 servers, a mainframe, a Xerox printer, and NOC that staffs the data center 24x7.

The size of your data center and the number of servers justifies an uncompromising design. Computer Room Air Conditioners (CRACs) are precisely what the name implies: air conditioners designed specifically for the needs and demands of the computer room. I'm assuming from the wording of your question that the roof-mounted Air Handling Units (AHUs) that you are also considering are conventional units designed for the standard office environment, and probably run off the building central system. A data center should be as independent as possible. It is unlikely that standard rooftop AHUs will maintain the close tolerance temperature and humidity control you should have in a high-availability data center environment, which it appears you intend to have if you are staffing the NOC 24x7. (Incidentally, the NOC should be provided with a normal office environment to make it more comfortable and controllable for the occupants.) Standard AHUs are normally designed to handle more latent heat (evaporation of moisture from human activity), whereas CRAC units are designed to humidify while also handling mostly sensible heat (the dry heat you feel or sense coming off of computer hardware).

You don't identify where in the country you are located, but if you are in the North, roof-mounted AHUs can present some operational and maintenance problems in deep winter, and if you're in the South, they may not provide the level of humidity control you need. With today's concerns about energy efficiency, you will probably also find CRACs to be more economical in the long run, particularly if you are in a part of the country where you can take advantage of winter temperatures to utilize "free cooling." The raised floor question is one that is widely debated these days. I still prefer a raised floor in most situations, particularly if I have enough building height to utilize the floor for air delivery. (That means 18-inches minimum, and preferably 24-30 inches. It also means controlling obstructions under the floor, including piping, power and cable.) With roof-mounted AHUs, you're not going to deliver the air to the floor, so it becomes a matter of personal preference and budget.

I still like to have power and permanent cable infrastructure under the floor if I can, but others have different opinions. If you can't make a raised floor high enough to use it for efficient air delivery, then, whether you use roof-mounted AHUs or CRACs, you will be delivering air from overhead. This can certainly be done, and can be done well, but it requires more design than simply blowing cold air into the room. Warm air rises, so dumping cold air in from above in the closely-coupled "Hot Aisle/Cold Aisle" design of a data center essentially contradicts the laws of physics since the warm air will rise and mix with the cold. Either solution will require well-designed ducting to cool and operate efficiently. Therefore, this is probably easier to do, and certainly less space consuming, with roof-mounted AHUs for which the return is already at the ceiling. On "Top Blow" CRACs the return air intake is at the lower front or back of the unit, which presents greater duct design problems.

In my opinion, however, unless other factors preclude it, I would opt for CRACs in an important facility every time. If I'm interpreting your question correctly, you are asking if you should use enclosures with fans mounted on the rear doors, blowing into the hot aisles. I consider most of the "fan boosted" solutions to be means of addressing problems caused by a poor basic cooling design. I say "most" because there are cabinets that are truly engineered to support higher density loads than can be achieved with high-flow cabinet doors alone, even in a well designed facility. But these cabinets generally duct the hot air to an isolated return path -- usually a plenum ceiling -- so they are solving more than just an air flow problem; they are also preventing re-circulation of hot air, which in itself makes a big difference. Remember, however, that fans will try to pull air out of the floor or cold aisle in the quantity they were designed for, and this may air-starve other equipment farther down the row.