15
13.
Faults and causes
Work on the cooling circuit and work on the electrical wiring may only be performed by
trained expert personnel or the DELTATHERM service.
Verifications and repairs may only be performed if the device is disconnected from all
power supplies.
Fault
Cause
Solution
Operating manual for LT series cooling water heat exchanger
Too low cooling
performance
Condenser or evaporator are
polluted
Lack of cooling fluid
Environment temperature too
high
Device is overloaded
Filter mat is blocked
Clean parts
Have an expert remedy
the leak
Fill in cooling fluid
Reduce room
temperature through
adequate measures (i.e.
additional ventilators)
Check whether additional
users were connected or
the production conditions
changed
Change the filter mat
Pump runs, compressor
does not switch on
“Fault” Temperature
regulator temperature
excess
“Fault” Pump does not
switch on
“Fault” Motor protection
switch “Compressor”
“Fault” High pressure
switch
“Fault” low pressure
switch
Filling level fault
Check settings on
temperature control
Fluid temperature is too
high
Motor winding protection
in motor winding is open
If necessary, exchange
temperature control
Have expert check
Limit values are
exceeded or underrun
Check temperature
control and device
Check sensor
“Pump” motor protection
switch triggers
Check fuses
Pump works outside its
characteristic
“Compressor” motor
protection switch triggers
Compressor does not
switch on
Check fuses
Environment temperature
too high
Condenser polluted
Ventilator defective
Have expert check
Fluid temperature too low
Condenser polluted
Lack of cooling fluid
Cold circuit component defective
Raise temperature
Clean condenser
Have expert check
Filling level in the container too low
Leak in the fluid circuit
Check filling level
Refill fluid
Look for leak
