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Operating Manual | Roof-mounted Cooling Unit | Multi Controller (MC) – 230 V | 086100023d 8/80
2 Safety
2.1 Intended use
The Pfannenberg roof-mounted cooling units of the DTT-series are stationary cooling units for heat dissipation from switch
cabinets. The DTT-cooling units are mounted on the switch cabinet roof.
The cooling units have different cooling capacities. See the chapter "Refrigeration circuit", Page 27for exact capacity data.
The cooling units have a cut-out compatibility with air/air heat exchangers and air/water heat exchangers. The use of aluminum
filters, felt filters or bellows filters is possible with an additional adapter.
The cooling units are available with different controllers. Cooling units with a Standard-Controller (SC) or a Multi-Controller (MC)
are available. These controllers are control unit for setting refrigeration functions and operating data. They also enable readout
of system messages and diagnostic data.
The Multi-Controller (MC) is additionally equipped with a Multimaster function and an energy-saving mode.
• For detailed data of the controller, see chapter "Technical data", Page 27, "Electrical connection", Page 42and
"Operation", Page 51.
All Pfannenberg cooling units are RoHS compliant and free from:
• Silicone compounds
• PCT, asbestos, formaldehyde, cadmium
• Substances that cause wetting defects
2.2 Permissible usage conditions
• The permissible ambient air temperature of the DTT-cooling units is at +15°C to +55 °C (+59 °F to +131 °F).
• The permissible storage temperature of the DTT-cooling units may not exceed +70 °C (+158 °F).
• Operation of the DTT-cooling units is only permissible with stationary assembly and with the switch cabinets closed.
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