Pfannenberg DTT 6201 - Rectification of Operating Faults; General

ENG
Operating Manual | Roof-mounted Cooling Unit | Multi Controller (MC) – 230 V | 086100023d 67/80
7 Rectification of operating faults
7.1 General
NOTE
Flashing of the red LED light on the controller card is not a fault indication or error message.
The red LED light indicates that the cooling unit is carrying voltage.
Fault Possible causes Remedial measures
Unit does not cool, evaporator fan
(internal) running
Temperature setting too high. Check temperature setting.
Unit does not cool sufficiently Application limits exceeded.
Check ambient air temperature and
internal load.
Low refrigerant level.
Call authorized specialist personnel,
check the unit for leaks.
Heat exchanger contaminated. Cleaning the heat exchanger.
Evaporator fan (internal) defective.
Condenser fan (external) defective.
Call authorized specialist personnel;
change fan.
Air circulation in switch cabinet
disrupted.
Check installations and circulation
channels in the switch cabinet.
Check the air inflow and outflow from the
cooling unit into the inlet and outlet
openings of the switch cabinet.
Check DIP-switch and cable
connections.
Unit only cools sometimes. DIP-switch set incorrectly or defective.
Set higher temperature on the DIP-
switch.
Condensate formation in the switch
cabinet
Blow-out temperature too low. Close switch cabinet door.
Switch cabinet is not sufficiently sealed.
Rectify any leaky areas or seals on the
switch cabinet.
Check temperature setting.
Condensate does not drain Condensate drain is blocked. Clean the condensate drain.
Check whether the condensate drain
hose is free of kinks and installed on a
gradient.
Condensate drips from the unit.
Condensate evaporator defective or
there is too much condensate.
Change fuses for condensate
evaporator.
Switch cabinet is not sufficiently sealed.
Rectify any leaky areas or seals on the
switch cabinet.
Tab. 11: General operating faults