Operating Manual DTT 6801 Multicontroller (MC) 086100037 © Pfannenberg GmbH Page 32 / 49
4 Operation
4.1 General functions
Danger of damage to the cooling unit
Operation without the unit cover prevents the adequate supply of air to the condenser and limits the intended
heating function.
Only operate the cooling unit with the unit cover installed.
The multicontroller (MC) has a control panel with a green LED light (1). If an error occurs, the green LED light (1)
blinks and various system information is displayed in the LCD (2); see LCD.
If assembly and installation work are completed, switch on the power supply to the cooling unit.
The cooling unit starts its operation and the LED light (1) illuminates green continuously.
After the supply voltage has been connected and the door is closed, the units run continuously.
Exception: Energy-saving mode and cooling units with antifreeze option.
The external temperature sensor controls energy-saving mode; see TS2 temperature sensors.
The multimaster function can connect up to six cooling connected cooling units with the bus function.
The LCD (2) displays the current operating statuses; see control panel.
The cooling unit is fitted with an electronic control system. An internal temperature sensor (4) detects the
temperature of the air sucked in from the interior of the switch cabinet (3). If the upper or lower limit temperature
is exceeded or undercut, a fault indication is triggered (5).
The green LED light (1) blinks and the LCD (2) displays the error number with temperature (°C/°F).
The ambient conditions and switch cabinet interior temperatures must correspond to the prescribed technical
data; see Technical data.
The ambient temperature must be less than 55°C; see Air flow functional principle.
The following values are set in the condition as supplied from the factory:
• The switch cabinet temperature setpoint is 35°C.
• The maximum switch cabinet temperature is 50°C.
• The minimum switch cabinet temperature is 15°C.
• The unit of measure for the switch cabinet temperature is °C.
Figure 32 - Electronic control function
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