Pfannenberg DTT 6801 Series User Manual

Operating Manual DTT 6801 Multicontroller (MC) 086100037 © Pfannenberg GmbH Page 47 / 49
GB
6 Troubleshooting
Fault
Possible causes
Corrective measures
Unit does not cool,
Evaporator fan
(internal) running
• Temperature setting too high.
 Check the temperature setting.
Unit does not cool
sufficiently
• Operating limits exceeded.
 Check the ambient temperature and internal
load.
• Too little coolant.
 Call in authorized qualified personnel to
check the unit for leakage.
• Heat exchanger dirty.
 Clean the heat exchanger.
• Evaporator fan (internal) defect.
• Condenser fan (external) defect.
 Call in authorized, qualified personnel;
replace fan.
• Disturbance in the air circulation
inside the cabinet.
 Check the installation and the path of air
circulating in the switchgear cabinet.
 Check the supply and outlet flow of air of
the cooling unit to the inlet and outlet
opening of the switch cabinet.
Unit cools only
periodically
• Temperature set incorrectly or
defective.
 Set to a higher temperature.
Condensate
accumulates in the
switch cabinet
• Exhaust temperature is too high.
 Close the cabinet door.
• Switch cabinet is not sufficiently
sealed.
 Correct leaky points or seals on the switch
cabinet.
 Check the temperature setting.
Condensate does not
drain
• Condensate drain is plugged up.
 Clean the condensate drain.
 Check whether the condensate drain hose
is free from kinks and is installed with a
downward slope.
Condensate drains from
the unit
• Condensate evaporator defector is
too much condensate accumulates.
 Replace fuses for the condensate
evaporator.
• Switch cabinet is not sufficiently
sealed.
 Correct leaky points or seals on the switch
cabinet.
 The blinking of the red LED light on the controller circuit board is not a fault indicator or error message. The red
LED light indicates that voltage is supplied to the cooling unit.

Pfannenberg DTT 6801 Series Specifications

General

Brand	Pfannenberg
Model	DTT 6801 Series
Category	Controller
Language	English