Troubleshooting - Pfannenberg DTI Serie Manual De Instrucciones

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6

Troubleshooting

Fault
Unit does not cool;
Evaporator fan
(internal) running
Unit does not cool
sufficiently
Unit cools only
periodically
Condensate
accumulates in the
switch cabinet
Condensate does not
drain
Condensate drains from
the unit

The blinking of the red LED light on the controller circuit board is not a fault indicator or error message. The red
LED lamp indicates that voltage is supplied to the cooling unit.
Operating Manual DTS and DTI 6401 / 6501 Standard Controller (SC) 086100007 © Pfannenberg GmbH
Possible causes
• Temperature setting too high.
• Operating limits exceeded.
• Too little coolant.
• Heat exchanger dirty.
•
Evaporator fan (internal)
•
Condenser fan (external)
• Disruption in the air circulation
inside the cabinet.
• Dip switch set incorrectly or
defective.
• Exhaust temperature is too low.
• Switch cabinet is not sufficiently
sealed.
• Condensate drain is plugged up.
• Condensate evaporator is defective
or too much condensate
accumulates.
• Switch cabinet is not sufficiently
sealed.
Corrective measures
 Check the temperature setting.
 Check the ambient temperature and internal
load.
 Call in authorized qualified personnel; check
the unit for leakage.
 Clean the heat exchanger.
 Call in authorized, qualified personnel;
defective.
defective. replace fan.
 Check the installation and the path of air
circulating in the switch cabinet.
 Check the supply and outlet flow of air of
the cooling unit to the inlet and outlet
opening of the switch cabinet.
 Check DIP switch and cable connections.
 Set the DIP switch to a higher temperature.
 Close the cabinet door.
 Correct leaky points or seals on the switch
cabinet.
 Check the temperature setting.
 Clean the condensate drain.
 Check whether the condensate drain hose
is free from kinks and is installed with a
downward slope.
 Replace fuses for the condensate
evaporator.
 Correct leaky points or seals on the switch
cabinet.
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