The roof-mounted cooling unit DTT 6601 400V MC 7035 by Pfannenberg is an industrial-grade climate control system for enclosures, mounted on top of the enclosure. It provides controlled cooling of the internal temperature to ensure the functionality and lifespan of electronic components. The device is specifically designed for use in production environments where floor space must be used sparingly and escape routes must remain clear. The roof-mounted design also protects the unit from mechanical damage during operation.

Applications
This cooling unit is universally applicable and fits enclosures from various manufacturers. It is suitable for industrial applications requiring constant internal temperature in the enclosure, such as in manufacturing automation, process engineering, or power supply. With a cooling capacity of up to 3,200 W at 460 V and 3,000 W at 400 V (A35/A35), it is ideal for medium to large enclosures. The operating voltage of 400/460 V, 3~, ±10 %, covers common industrial power supply voltages.

Features and Equipment in Detail
A key feature is the patented condensate management, which works through an innovative arrangement of refrigeration circuits. This technology reliably prevents condensate from entering the enclosure, which is especially important under varying environmental conditions. The integrated condensate evaporation with safety overflow ensures that condensed water evaporates within the unit and does not enter the enclosure. The Multi-Controller (MC) enables an energy-saving switching mode, where an additional sensor turns off the internal fans as needed to save energy. The control ranges are adjustable: from +25 to +45 °C for the standard controller (SC), and from +25 to +50 °C for the Multi-Controller, with the factory default set at +35 °C.

Technology Explained Simply
The unit operates with refrigerant R134a in a charge of 1,250 g. Cooling capacity is measured according to EN 14511, with values specified for A35/A35 (enclosure and ambient temperature each 35 °C) and A35/A50 (enclosure 35 °C, ambient 50 °C). At A35/A35, cooling capacity is 3,000 W at 400 V and 3,200 W at 460 V. Power consumption is 1,700 W (400 V) or 2,100 W (460 V). The air flow rate is 1,420 m³/h internally and 1,970 m³/h externally when free-blowing. The noise level is < 62 dB(A) as measured per EN ISO 3741, which is acceptable for industrial environments.

Compatibility and Accessories
The unit is available in various versions, including with a stainless steel enclosure. Accessories include a condensate bottle (part number 18314000100), a quick-change frame (18300000146), non-woven (18300000147), pleated (18300000148), and aluminum filters (18300000149), as well as a filter adapter (18310000151). These components can be used to improve air quality or simplify maintenance. The filter mat is optional and can be easily mounted in the front area.

Installation and Mounting
Mounting is tool-free via a quick-mount frame, simplifying installation and maintenance. The hood is removable from the front, providing quick access to internal components such as filters and control elements. The enclosure is made of galvanized steel sheet, and the hood is electrostatically powder-coated in RAL 7035. Other colors are available upon request. The protection rating is IP 54 against the enclosure and IP 34 against the environment under normal use.

Operational Advantages
The robust steel sheet construction without plastic parts makes the unit suitable for industrial requirements. Tool-free mounting and the removable hood enhance serviceability. Integrated condensate evaporation prevents damage from moisture. The Multi-Controller reduces energy consumption by turning off internal fans as needed. The combination of functionality and design makes this unit a reliable solution for enclosure climate control.

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• roof-mounted cooling unit
• condensate management
• Multi-Controller
• R134a
• IP 54
• RAL 7035