Operating Manual DTT 6801 Multicontroller (MC) 086100037 © Pfannenberg GmbH Page 36 / 49
4.4 Operation of the cooling unit
Condensate can damage the electronic components in the switch cabinet.
Internal temperatures below the dewpoint or damaged switch cabinet seals cause excessive accumulation of
condensate.
Regular inspection of the seals assures protection against heavy condensate accumulation.
Ensure that the accumulating condensate can drain freely.
• After connection of the mains voltage, the device switches to startup/test mode or directly to operating mode.
The controller equipment determines which mode is activated.
• In operating mode, the cooling units switches to cooling mode as needed. This takes place depending on
whether a temperature switching threshold (TSet) is reached or undercut.
Cooling mode switches off when the temperature switching threshold (TSet) is undercut. It continues running if
the temperature switching threshold (TSet) has not been reached yet.
The evaporator fan (internal) fan (external) and compressor switch off when the door is opened.
Operating conditions
• The mains voltage must lie within the specified range; see Electrical data.
A deviation of ± 10 % is permissible.
• The rated frequency must be within ± 3 Hz of the value specified.
The ambient temperature must be below 55 °C. For further options, see Technical data.
The cooling unit must only be used in such a manner as to ensure that the specified cooling capacity is able to
meet actual demands.
Only the specified coolant may be used.
Spare parts from third-party manufacturers can damage the unit
Internal temperatures below the dewpoint or damaged switch cabinet seals cause excessive accumulation of
condensate.
Only use specially harmonized manufacturer parts for safe and reliable operation.
For Pfannenberg spare part numbers, see ordering spare parts and accessory parts.
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