Close control systems

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Reliable and energy-efficient solutions for CRAC /close control units 

New energy and performance standards and low PUE targets in data centers, server rooms, and communication networks require Computer Room Air Conditioners (CRAC) with precise control to achieve high reliability, better humidity, and temperature settings as well as part-load efficiency. Ensure the cooling of your data server room will enable your business to perform at peak even with higher evaporating temperatures.

Precision air conditioning in data centers

Such cooling units need to operate reliably and provide cooling in both compressor and free cooling modes. The maintenance of stable temperatures and humidity is a key design challenge in these applications since they are used in environments where ambient temperatures often vary significantly during the day.

Danfoss microchannel heat exchangers (MCHE), scrolls with IDVs and inverter compressors, sensors, controllers, and electronic stepper motor valves let you adjust to temperature and load fluctuations to create cooling systems that safeguard these sensitive technologies while potentially reducing refrigerant charges. Our solutions include options for lower-GWP refrigerants. All of these backed up by Danfoss’s excellent technical support from our expert teams.

Features and benefits

All you need in one place, delivered by highly experienced air conditioning experts

Precise temperature control to safeguard sensitive equipment

Compact, space-saving units

Low energy consumption

Optimized for environmentally friendly, low GWP refrigerants

Reduced applied costs, short payback times and easy service

Dedicated customer service around the world

Key for application diagram:

  • Compressors
  • Pressure switch
  • Ball valve
  • Check valve
  • Condenser
  • Fan
  • Solenoid valve
  • Filter drier
  • Sight glass
  • Expansion device
  • Evaporator
  • Controller
  • Pressure sensor
Close control diagram - Danfoss

Documents

Documents
Type Name Language Valid for Updated Download File type
Brochure Close Control A/C brochure English Multiple 17 Sep, 2014 987.8 KB .pdf

Related products

  • if (isSmallPicture) { NRV refrigeration check valves - Danfoss } else if (isBigColumns) { NRV refrigeration check valves - Danfoss } else { NRV refrigeration check valves - Danfoss }
    NRV refrigeration check valves

    NRV and NRVH can be used in liquid, suction and hot gas lines in refrigeration and air conditioning plants with fluorinated refrigerants. NRV and NRVH can be supplied with flare and solder connections. They are also available with oversize solder connections providing flexibility in the use of check valves.

  • if (isSmallPicture) { Danfoss WVFX, WVTS, and WVO pressure operated water valves } else if (isBigColumns) { Danfoss WVFX, WVTS, and WVO pressure operated water valves } else { Danfoss WVFX, WVTS, and WVO pressure operated water valves }
    Water regulating valves

    Pressure operated water valves are used for regulating the flow of water in refrigeration plants with water-cooled condensers.

  • if (isSmallPicture) { ETS electric expansion valve - Danfoss } else if (isBigColumns) { ETS electric expansion valve - Danfoss } else { ETS electric expansion valve - Danfoss }
    ETS electric expansion valves

    ETS is a series of electric expansion valves for precise liquid injection in evaporators for air conditioning and refrigeration applications. The valve piston and linear positioning design is fully balanced, providing bi-flow feature as well as solenoid tight shut-off function in both flow directions. ETS valves are compatible with electronic control solutions from Danfoss and other manufacturers.

  • if (isSmallPicture) { Thermostatic expansion valves - Danfoss } else if (isBigColumns) { Thermostatic expansion valves - Danfoss } else { Thermostatic expansion valves - Danfoss }
    Thermostatic expansion valves

    Thermostatic expansion valves (TXV) are available as parts programs, i.e. with separate valve body and orifice assemblies, or as complete valves (fixed orifice). The category also contains thermostatic injection valves.

  • if (isSmallPicture) { Solenoid valves for HVAC } else if (isBigColumns) { Solenoid valves for HVAC } else { Solenoid valves for HVAC }
    Solenoid valves for HVAC-R

    Solenoid Valves for refrigeration applications, standard types for fluorinated refrigerants and ammonia (R717) as well as solenoid valves for water and brine. The category also contains solenoid valves in stainless steel, gas powered valves and pulse solenoid valves.

Related solutions

Case studies

  • if (isSmallPicture) { Efficient data center cooling with inverter technology } else if (isBigColumns) { Efficient data center cooling with inverter technology } else { Efficient data center cooling with inverter technology }
    Low PUE in data center cooling saves energy and costs

    A British manufacturer have recently installed a scalable data center together with one of their customers which has achieved the impressive Power Usage Effectiveness rating (PUE) of 1.21.

    For security reasons we cannot reveal the name and the location of the data center since the information managed by the servers is in many cases very sensitive.

News

  • if (isSmallPicture) { Variable-speed VZH compressor management } else if (isBigColumns) { Variable-speed VZH compressor management } else { Variable-speed VZH compressor management }
    Danfoss revamps medium and large programmable controls and introduces variable-speed VZH compressor management
    23 September 2020

    Danfoss has upgraded its MCX15B and MCX20B controllers with the introduction of the MCX15B2 and MCX20B2 controllers. Both models combine best-in-class connectivity, security, and performance with improved compressor control logic for VZH inverter scroll compressors.

  • if (isSmallPicture) { Danfoss Inverter Scrolls VZH range from 4 to 26TR Turbocor® } else if (isBigColumns) { Danfoss Inverter Scrolls VZH range from 4 to 26TR Turbocor® } else { Danfoss Inverter Scrolls VZH range from 4 to 26TR Turbocor® }
    Third-generation VZH scrolls bring further seasonal efficiency gains
    27 May 2019

    Danfoss has boosted the part load performance and the operating map of its leading VZH variable speed scroll compressor range. The third-generation of commercial inverter scrolls VZH retain the strengths of the previous version, with the addition of the Intermediate Discharge Valve (IDV) technology for enhanced seasonal efficiency, and a wider operating map.

  • if (isSmallPicture) { } else if (isBigColumns) { } else { }
    Multi-refrigerant DSH scrolls give OEMs “ultimate flexibility” on low GWP
    17 April 2019

    Danfoss has qualified its range of DSH scroll compressors for use with R454B and R452B refrigerants, giving OEMs “ultimate flexibility” when offering alternatives to R410A.

Contact us

For further information, please contact us.