The Rittal roof-mounted cooling unit SK 3385540 is an industrial-grade climate control system for enclosures, designed as a roof-mounted unit. It is manufactured from sheet steel and supplied in the color RAL 7035, enabling robust and visually uniform integration into industrial environments. The unit is designed for cooling enclosures in operating environments with ambient temperatures from +10 °C to +55 °C and offers a total cooling capacity of up to 2.14 kW at 60 Hz, measured according to DIN EN 14511. The cooling capacity varies depending on operating frequency and ambient temperature, reaching 2 kW at 50 Hz under L35 L35 operation. The rated power is 1.02 kW at 50 Hz and 1.27 kW at 60 Hz, defining the electrical load on the network. The energy efficiency is described by the Energy Efficiency Ratio (EER) of 1.96 (50 Hz) and 1.69 (60 Hz) under L35 L35 operation, representing the ratio of cooling capacity to electrical energy consumption.

Applications
This cooling unit is primarily intended for use in industrial facilities where enclosures must be protected from overheating. Due to its low noise level, it is also suitable for office applications, especially when minimizing noise emissions in the work environment is desired. The operating temperature range of +10 °C to +55 °C (at 50 Hz) or up to +53 °C (at 60 Hz) allows use in a wide range of environments, from climate-controlled halls to outdoor areas with moderate temperatures. The storage temperature range of -40 °C to +70 °C demonstrates the unit’s robustness under extreme storage conditions.

Functions and Features in Detail
The unit includes an integrated e-Comfort controller for temperature regulation. Factory-set temperature is +35 °C, with an adjustable range between +20 °C and +53 °C. Temperature control is managed by the controller, which also enables monitoring of the operating status. An integrated electrical condensate evaporation system ensures that condensate does not accumulate inside the enclosure but evaporates instead. The condenser is coated with a hydrophobic RiNano coating, improving condensate drainage and reducing maintenance. The unit is pre-wired for connection and features a pluggable terminal block, simplifying installation. The delivery includes a drilling template and mounting hardware to facilitate installation on the enclosure.

Technology Explained Simply
The cooling technology is based on a refrigeration cycle using refrigerant R-513A, with a quantity of 0.9 kg. The refrigerant has a Global Warming Potential (GWP) of 631 and corresponds to a CO₂ equivalent of 0.57 t. The rated operating voltage is 400 V, 2~, 50/60 Hz, enabling use in standardized industrial power networks. The rated current is up to 4.2 A (50 Hz) or 4.4 A (60 Hz), while the starting current is up to 11.7 A. The duty cycle is rated at 100 %, meaning the unit can operate continuously. The airflow rate is 1,760 m³/h in the external circuit and 470 m³/h in the internal circuit, ensuring efficient air circulation within the enclosure. The protection rating IP is IP 34 for the external circuit and IP 54 for the internal circuit, making it dust- and splash-proof and suitable for outdoor use.

Compatibility and Accessories
The unit is compatible with an IoT interface, with networking achieved via a Blue e IoT adapter, specifically developed for cooling units with e-Comfort controller and cooling capacity from 500 W. Suitable accessories include metal filters for the SK series, air duct systems for roof-mounted cooling units, quick-change frames for TopTherm series, closure plugs, condensate hoses (12 x 2 mm, 10 m length), filter mats, door position switches, and SK Master/Slave cables for the SK bus system. These components enable customizable and expandable installations, especially in larger facilities or when integrating into networked control systems.

Installation and Mounting
Mounting is performed on the roof of the enclosure. The included drilling template and mounting hardware facilitate installation. Electrical connection is made via the integrated pluggable terminal block. The fuse is implemented as a transformer protection switch with a nominal rating of 6.3 to 10 A. The dimensions are 597 mm (width) × 417 mm (height) × 475 mm (depth), allowing placement on standard enclosures. The permissible operating pressure is 28 bar, ensuring system safety under operating conditions.

Operational Advantages
The unit is characterized by high operational reliability, continuous cooling performance, and low maintenance requirements. The integrated electrical condensate evaporation system reduces the need for manual drainage. The hydrophobic RiNano coating on the condenser prevents deposits and improves heat transfer. Energy efficiency has been improved compared to older models, resulting in lower operating costs. Connectivity via the IoT interface enables remote monitoring and control, which is particularly beneficial in large-scale installations. The low noise emission makes the unit suitable for office environments where a disturbance-free working atmosphere is desired.

Note: Scope of Delivery
The scope of delivery includes: condenser with hydrophobic RiNano coating, integrated electrical condensate evaporation system, pre-wired for connection (pluggable terminal block), drilling template, mounting hardware. Batteries, additional filters, or external control devices are not included.